Mercurial > hg > octave-nkf

annotate libcruft/lapack/ssteqr.f @ 9665:1dba57e9d08d

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use blas_trans_type for xgemm
author Jaroslav Hajek <highegg@gmail.com>
date Sat, 26 Sep 2009 10:41:07 +0200
parents 82be108cc558
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7789
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1 SUBROUTINE SSTEQR( COMPZ, N, D, E, Z, LDZ, WORK, INFO )
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2 *
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3 * -- LAPACK routine (version 3.1) --
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4 * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
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5 * November 2006
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6 *
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7 * .. Scalar Arguments ..
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8 CHARACTER COMPZ
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9 INTEGER INFO, LDZ, N
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10 * ..
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11 * .. Array Arguments ..
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12 REAL D( * ), E( * ), WORK( * ), Z( LDZ, * )
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13 * ..
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14 *
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15 * Purpose
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16 * =======
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17 *
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18 * SSTEQR computes all eigenvalues and, optionally, eigenvectors of a
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19 * symmetric tridiagonal matrix using the implicit QL or QR method.
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20 * The eigenvectors of a full or band symmetric matrix can also be found
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21 * if SSYTRD or SSPTRD or SSBTRD has been used to reduce this matrix to
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22 * tridiagonal form.
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23 *
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24 * Arguments
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25 * =========
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26 *
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27 * COMPZ (input) CHARACTER*1
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28 * = 'N': Compute eigenvalues only.
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29 * = 'V': Compute eigenvalues and eigenvectors of the original
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30 * symmetric matrix. On entry, Z must contain the
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31 * orthogonal matrix used to reduce the original matrix
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32 * to tridiagonal form.
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33 * = 'I': Compute eigenvalues and eigenvectors of the
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34 * tridiagonal matrix. Z is initialized to the identity
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35 * matrix.
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36 *
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37 * N (input) INTEGER
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38 * The order of the matrix. N >= 0.
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39 *
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40 * D (input/output) REAL array, dimension (N)
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41 * On entry, the diagonal elements of the tridiagonal matrix.
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42 * On exit, if INFO = 0, the eigenvalues in ascending order.
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43 *
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44 * E (input/output) REAL array, dimension (N-1)
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45 * On entry, the (n-1) subdiagonal elements of the tridiagonal
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46 * matrix.
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47 * On exit, E has been destroyed.
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48 *
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49 * Z (input/output) REAL array, dimension (LDZ, N)
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50 * On entry, if COMPZ = 'V', then Z contains the orthogonal
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51 * matrix used in the reduction to tridiagonal form.
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52 * On exit, if INFO = 0, then if COMPZ = 'V', Z contains the
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53 * orthonormal eigenvectors of the original symmetric matrix,
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54 * and if COMPZ = 'I', Z contains the orthonormal eigenvectors
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55 * of the symmetric tridiagonal matrix.
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56 * If COMPZ = 'N', then Z is not referenced.
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57 *
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58 * LDZ (input) INTEGER
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59 * The leading dimension of the array Z. LDZ >= 1, and if
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60 * eigenvectors are desired, then LDZ >= max(1,N).
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61 *
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62 * WORK (workspace) REAL array, dimension (max(1,2*N-2))
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63 * If COMPZ = 'N', then WORK is not referenced.
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64 *
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65 * INFO (output) INTEGER
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66 * = 0: successful exit
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67 * < 0: if INFO = -i, the i-th argument had an illegal value
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68 * > 0: the algorithm has failed to find all the eigenvalues in
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69 * a total of 30*N iterations; if INFO = i, then i
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70 * elements of E have not converged to zero; on exit, D
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71 * and E contain the elements of a symmetric tridiagonal
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72 * matrix which is orthogonally similar to the original
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73 * matrix.
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74 *
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75 * =====================================================================
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76 *
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77 * .. Parameters ..
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78 REAL ZERO, ONE, TWO, THREE
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79 PARAMETER ( ZERO = 0.0E0, ONE = 1.0E0, TWO = 2.0E0,
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80 $ THREE = 3.0E0 )
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81 INTEGER MAXIT
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82 PARAMETER ( MAXIT = 30 )
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83 * ..
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84 * .. Local Scalars ..
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85 INTEGER I, ICOMPZ, II, ISCALE, J, JTOT, K, L, L1, LEND,
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86 $ LENDM1, LENDP1, LENDSV, LM1, LSV, M, MM, MM1,
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87 $ NM1, NMAXIT
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88 REAL ANORM, B, C, EPS, EPS2, F, G, P, R, RT1, RT2,
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89 $ S, SAFMAX, SAFMIN, SSFMAX, SSFMIN, TST
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90 * ..
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91 * .. External Functions ..
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92 LOGICAL LSAME
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93 REAL SLAMCH, SLANST, SLAPY2
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94 EXTERNAL LSAME, SLAMCH, SLANST, SLAPY2
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95 * ..
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96 * .. External Subroutines ..
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97 EXTERNAL SLAE2, SLAEV2, SLARTG, SLASCL, SLASET, SLASR,
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98 $ SLASRT, SSWAP, XERBLA
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99 * ..
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100 * .. Intrinsic Functions ..
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101 INTRINSIC ABS, MAX, SIGN, SQRT
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102 * ..
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103 * .. Executable Statements ..
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104 *
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105 * Test the input parameters.
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106 *
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107 INFO = 0
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108 *
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109 IF( LSAME( COMPZ, 'N' ) ) THEN
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110 ICOMPZ = 0
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111 ELSE IF( LSAME( COMPZ, 'V' ) ) THEN
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112 ICOMPZ = 1
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113 ELSE IF( LSAME( COMPZ, 'I' ) ) THEN
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114 ICOMPZ = 2
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115 ELSE
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116 ICOMPZ = -1
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117 END IF
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118 IF( ICOMPZ.LT.0 ) THEN
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119 INFO = -1
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120 ELSE IF( N.LT.0 ) THEN
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121 INFO = -2
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122 ELSE IF( ( LDZ.LT.1 ) .OR. ( ICOMPZ.GT.0 .AND. LDZ.LT.MAX( 1,
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123 $ N ) ) ) THEN
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124 INFO = -6
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125 END IF
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126 IF( INFO.NE.0 ) THEN
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127 CALL XERBLA( 'SSTEQR', -INFO )
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128 RETURN
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129 END IF
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130 *
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131 * Quick return if possible
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132 *
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133 IF( N.EQ.0 )
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134 $ RETURN
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135 *
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136 IF( N.EQ.1 ) THEN
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137 IF( ICOMPZ.EQ.2 )
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138 $ Z( 1, 1 ) = ONE
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139 RETURN
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140 END IF
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141 *
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142 * Determine the unit roundoff and over/underflow thresholds.
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143 *
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144 EPS = SLAMCH( 'E' )
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145 EPS2 = EPS**2
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146 SAFMIN = SLAMCH( 'S' )
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147 SAFMAX = ONE / SAFMIN
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148 SSFMAX = SQRT( SAFMAX ) / THREE
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149 SSFMIN = SQRT( SAFMIN ) / EPS2
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150 *
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151 * Compute the eigenvalues and eigenvectors of the tridiagonal
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152 * matrix.
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153 *
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154 IF( ICOMPZ.EQ.2 )
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155 $ CALL SLASET( 'Full', N, N, ZERO, ONE, Z, LDZ )
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156 *
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157 NMAXIT = N*MAXIT
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158 JTOT = 0
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159 *
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160 * Determine where the matrix splits and choose QL or QR iteration
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161 * for each block, according to whether top or bottom diagonal
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162 * element is smaller.
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163 *
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164 L1 = 1
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165 NM1 = N - 1
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parents:
diff changeset
166 *
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parents:
diff changeset
167 10 CONTINUE
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parents:
diff changeset
168 IF( L1.GT.N )
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parents:
diff changeset
169 $ GO TO 160
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parents:
diff changeset
170 IF( L1.GT.1 )
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parents:
diff changeset
171 $ E( L1-1 ) = ZERO
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parents:
diff changeset
172 IF( L1.LE.NM1 ) THEN
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David Bateman <dbateman@free.fr>
parents:
diff changeset
173 DO 20 M = L1, NM1
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
174 TST = ABS( E( M ) )
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parents:
diff changeset
175 IF( TST.EQ.ZERO )
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parents:
diff changeset
176 $ GO TO 30
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parents:
diff changeset
177 IF( TST.LE.( SQRT( ABS( D( M ) ) )*SQRT( ABS( D( M+
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
178 $ 1 ) ) ) )*EPS ) THEN
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
179 E( M ) = ZERO
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
180 GO TO 30
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parents:
diff changeset
181 END IF
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
182 20 CONTINUE
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
183 END IF
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parents:
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184 M = N
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parents:
diff changeset
185 *
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parents:
diff changeset
186 30 CONTINUE
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187 L = L1
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188 LSV = L
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parents:
diff changeset
189 LEND = M
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parents:
diff changeset
190 LENDSV = LEND
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parents:
diff changeset
191 L1 = M + 1
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parents:
diff changeset
192 IF( LEND.EQ.L )
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parents:
diff changeset
193 $ GO TO 10
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parents:
diff changeset
194 *
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diff changeset
195 * Scale submatrix in rows and columns L to LEND
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parents:
diff changeset
196 *
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197 ANORM = SLANST( 'I', LEND-L+1, D( L ), E( L ) )
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198 ISCALE = 0
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199 IF( ANORM.EQ.ZERO )
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parents:
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200 $ GO TO 10
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parents:
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201 IF( ANORM.GT.SSFMAX ) THEN
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202 ISCALE = 1
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203 CALL SLASCL( 'G', 0, 0, ANORM, SSFMAX, LEND-L+1, 1, D( L ), N,
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204 $ INFO )
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parents:
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205 CALL SLASCL( 'G', 0, 0, ANORM, SSFMAX, LEND-L, 1, E( L ), N,
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parents:
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206 $ INFO )
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207 ELSE IF( ANORM.LT.SSFMIN ) THEN
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208 ISCALE = 2
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209 CALL SLASCL( 'G', 0, 0, ANORM, SSFMIN, LEND-L+1, 1, D( L ), N,
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parents:
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210 $ INFO )
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parents:
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211 CALL SLASCL( 'G', 0, 0, ANORM, SSFMIN, LEND-L, 1, E( L ), N,
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212 $ INFO )
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parents:
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213 END IF
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parents:
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214 *
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parents:
diff changeset
215 * Choose between QL and QR iteration
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parents:
diff changeset
216 *
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parents:
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217 IF( ABS( D( LEND ) ).LT.ABS( D( L ) ) ) THEN
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parents:
diff changeset
218 LEND = LSV
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parents:
diff changeset
219 L = LENDSV
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parents:
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220 END IF
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parents:
diff changeset
221 *
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parents:
diff changeset
222 IF( LEND.GT.L ) THEN
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parents:
diff changeset
223 *
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parents:
diff changeset
224 * QL Iteration
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parents:
diff changeset
225 *
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parents:
diff changeset
226 * Look for small subdiagonal element.
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parents:
diff changeset
227 *
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parents:
diff changeset
228 40 CONTINUE
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diff changeset
229 IF( L.NE.LEND ) THEN
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parents:
diff changeset
230 LENDM1 = LEND - 1
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
231 DO 50 M = L, LENDM1
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parents:
diff changeset
232 TST = ABS( E( M ) )**2
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233 IF( TST.LE.( EPS2*ABS( D( M ) ) )*ABS( D( M+1 ) )+
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parents:
diff changeset
234 $ SAFMIN )GO TO 60
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parents:
diff changeset
235 50 CONTINUE
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
236 END IF
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parents:
diff changeset
237 *
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parents:
diff changeset
238 M = LEND
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parents:
diff changeset
239 *
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parents:
diff changeset
240 60 CONTINUE
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parents:
diff changeset
241 IF( M.LT.LEND )
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parents:
diff changeset
242 $ E( M ) = ZERO
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parents:
diff changeset
243 P = D( L )
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parents:
diff changeset
244 IF( M.EQ.L )
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parents:
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245 $ GO TO 80
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parents:
diff changeset
246 *
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parents:
diff changeset
247 * If remaining matrix is 2-by-2, use SLAE2 or SLAEV2
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parents:
diff changeset
248 * to compute its eigensystem.
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parents:
diff changeset
249 *
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parents:
diff changeset
250 IF( M.EQ.L+1 ) THEN
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
251 IF( ICOMPZ.GT.0 ) THEN
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252 CALL SLAEV2( D( L ), E( L ), D( L+1 ), RT1, RT2, C, S )
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253 WORK( L ) = C
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diff changeset
254 WORK( N-1+L ) = S
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parents:
diff changeset
255 CALL SLASR( 'R', 'V', 'B', N, 2, WORK( L ),
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parents:
diff changeset
256 $ WORK( N-1+L ), Z( 1, L ), LDZ )
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parents:
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257 ELSE
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diff changeset
258 CALL SLAE2( D( L ), E( L ), D( L+1 ), RT1, RT2 )
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259 END IF
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parents:
diff changeset
260 D( L ) = RT1
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parents:
diff changeset
261 D( L+1 ) = RT2
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parents:
diff changeset
262 E( L ) = ZERO
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parents:
diff changeset
263 L = L + 2
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David Bateman <dbateman@free.fr>
parents:
diff changeset
264 IF( L.LE.LEND )
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
265 $ GO TO 40
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parents:
diff changeset
266 GO TO 140
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parents:
diff changeset
267 END IF
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
268 *
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parents:
diff changeset
269 IF( JTOT.EQ.NMAXIT )
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parents:
diff changeset
270 $ GO TO 140
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David Bateman <dbateman@free.fr>
parents:
diff changeset
271 JTOT = JTOT + 1
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parents:
diff changeset
272 *
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parents:
diff changeset
273 * Form shift.
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parents:
diff changeset
274 *
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David Bateman <dbateman@free.fr>
parents:
diff changeset
275 G = ( D( L+1 )-P ) / ( TWO*E( L ) )
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parents:
diff changeset
276 R = SLAPY2( G, ONE )
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parents:
diff changeset
277 G = D( M ) - P + ( E( L ) / ( G+SIGN( R, G ) ) )
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parents:
diff changeset
278 *
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parents:
diff changeset
279 S = ONE
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David Bateman <dbateman@free.fr>
parents:
diff changeset
280 C = ONE
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parents:
diff changeset
281 P = ZERO
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parents:
diff changeset
282 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
283 * Inner loop
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
284 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
285 MM1 = M - 1
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David Bateman <dbateman@free.fr>
parents:
diff changeset
286 DO 70 I = MM1, L, -1
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David Bateman <dbateman@free.fr>
parents:
diff changeset
287 F = S*E( I )
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David Bateman <dbateman@free.fr>
parents:
diff changeset
288 B = C*E( I )
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David Bateman <dbateman@free.fr>
parents:
diff changeset
289 CALL SLARTG( G, F, C, S, R )
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parents:
diff changeset
290 IF( I.NE.M-1 )
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David Bateman <dbateman@free.fr>
parents:
diff changeset
291 $ E( I+1 ) = R
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
292 G = D( I+1 ) - P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
293 R = ( D( I )-G )*S + TWO*C*B
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parents:
diff changeset
294 P = S*R
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
295 D( I+1 ) = G + P
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parents:
diff changeset
296 G = C*R - B
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parents:
diff changeset
297 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
298 * If eigenvectors are desired, then save rotations.
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
299 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
300 IF( ICOMPZ.GT.0 ) THEN
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
301 WORK( I ) = C
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
302 WORK( N-1+I ) = -S
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parents:
diff changeset
303 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
304 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
305 70 CONTINUE
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parents:
diff changeset
306 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
307 * If eigenvectors are desired, then apply saved rotations.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
308 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
309 IF( ICOMPZ.GT.0 ) THEN
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
310 MM = M - L + 1
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parents:
diff changeset
311 CALL SLASR( 'R', 'V', 'B', N, MM, WORK( L ), WORK( N-1+L ),
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parents:
diff changeset
312 $ Z( 1, L ), LDZ )
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parents:
diff changeset
313 END IF
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
314 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
315 D( L ) = D( L ) - P
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David Bateman <dbateman@free.fr>
parents:
diff changeset
316 E( L ) = G
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
317 GO TO 40
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parents:
diff changeset
318 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
319 * Eigenvalue found.
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parents:
diff changeset
320 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
321 80 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
322 D( L ) = P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
323 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
324 L = L + 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
325 IF( L.LE.LEND )
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
326 $ GO TO 40
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
327 GO TO 140
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David Bateman <dbateman@free.fr>
parents:
diff changeset
328 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
329 ELSE
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
330 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
331 * QR Iteration
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parents:
diff changeset
332 *
82be108cc558 First attempt at single precision tyeps
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parents:
diff changeset
333 * Look for small superdiagonal element.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
334 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
335 90 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
336 IF( L.NE.LEND ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
337 LENDP1 = LEND + 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
338 DO 100 M = L, LENDP1, -1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
339 TST = ABS( E( M-1 ) )**2
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
340 IF( TST.LE.( EPS2*ABS( D( M ) ) )*ABS( D( M-1 ) )+
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
341 $ SAFMIN )GO TO 110
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
342 100 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
343 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
344 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
345 M = LEND
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
346 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
347 110 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
348 IF( M.GT.LEND )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
349 $ E( M-1 ) = ZERO
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
350 P = D( L )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
351 IF( M.EQ.L )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
352 $ GO TO 130
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
353 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
354 * If remaining matrix is 2-by-2, use SLAE2 or SLAEV2
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
355 * to compute its eigensystem.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
356 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
357 IF( M.EQ.L-1 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
358 IF( ICOMPZ.GT.0 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
359 CALL SLAEV2( D( L-1 ), E( L-1 ), D( L ), RT1, RT2, C, S )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
360 WORK( M ) = C
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
361 WORK( N-1+M ) = S
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
362 CALL SLASR( 'R', 'V', 'F', N, 2, WORK( M ),
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
363 $ WORK( N-1+M ), Z( 1, L-1 ), LDZ )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
364 ELSE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
365 CALL SLAE2( D( L-1 ), E( L-1 ), D( L ), RT1, RT2 )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
366 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
367 D( L-1 ) = RT1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
368 D( L ) = RT2
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
369 E( L-1 ) = ZERO
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
370 L = L - 2
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
371 IF( L.GE.LEND )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
372 $ GO TO 90
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
373 GO TO 140
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
374 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
375 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
376 IF( JTOT.EQ.NMAXIT )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
377 $ GO TO 140
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
378 JTOT = JTOT + 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
379 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
380 * Form shift.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
381 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
382 G = ( D( L-1 )-P ) / ( TWO*E( L-1 ) )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
383 R = SLAPY2( G, ONE )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
384 G = D( M ) - P + ( E( L-1 ) / ( G+SIGN( R, G ) ) )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
385 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
386 S = ONE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
387 C = ONE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
388 P = ZERO
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
389 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
390 * Inner loop
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
391 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
392 LM1 = L - 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
393 DO 120 I = M, LM1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
394 F = S*E( I )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
395 B = C*E( I )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
396 CALL SLARTG( G, F, C, S, R )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
397 IF( I.NE.M )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
398 $ E( I-1 ) = R
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
399 G = D( I ) - P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
400 R = ( D( I+1 )-G )*S + TWO*C*B
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
401 P = S*R
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
402 D( I ) = G + P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
403 G = C*R - B
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
404 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
405 * If eigenvectors are desired, then save rotations.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
406 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
407 IF( ICOMPZ.GT.0 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
408 WORK( I ) = C
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
409 WORK( N-1+I ) = S
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
410 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
411 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
412 120 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
413 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
414 * If eigenvectors are desired, then apply saved rotations.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
415 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
416 IF( ICOMPZ.GT.0 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
417 MM = L - M + 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
418 CALL SLASR( 'R', 'V', 'F', N, MM, WORK( M ), WORK( N-1+M ),
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
419 $ Z( 1, M ), LDZ )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
420 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
421 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
422 D( L ) = D( L ) - P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
423 E( LM1 ) = G
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
424 GO TO 90
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
425 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
426 * Eigenvalue found.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
427 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
428 130 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
429 D( L ) = P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
430 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
431 L = L - 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
432 IF( L.GE.LEND )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
433 $ GO TO 90
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
434 GO TO 140
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
435 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
436 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
437 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
438 * Undo scaling if necessary
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
439 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
440 140 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
441 IF( ISCALE.EQ.1 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
442 CALL SLASCL( 'G', 0, 0, SSFMAX, ANORM, LENDSV-LSV+1, 1,
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
443 $ D( LSV ), N, INFO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
444 CALL SLASCL( 'G', 0, 0, SSFMAX, ANORM, LENDSV-LSV, 1, E( LSV ),
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
445 $ N, INFO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
446 ELSE IF( ISCALE.EQ.2 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
447 CALL SLASCL( 'G', 0, 0, SSFMIN, ANORM, LENDSV-LSV+1, 1,
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
448 $ D( LSV ), N, INFO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
449 CALL SLASCL( 'G', 0, 0, SSFMIN, ANORM, LENDSV-LSV, 1, E( LSV ),
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
450 $ N, INFO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
451 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
452 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
453 * Check for no convergence to an eigenvalue after a total
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
454 * of N*MAXIT iterations.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
455 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
456 IF( JTOT.LT.NMAXIT )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
457 $ GO TO 10
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
458 DO 150 I = 1, N - 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
459 IF( E( I ).NE.ZERO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
460 $ INFO = INFO + 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
461 150 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
462 GO TO 190
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
463 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
464 * Order eigenvalues and eigenvectors.
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
465 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
466 160 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
467 IF( ICOMPZ.EQ.0 ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
468 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
469 * Use Quick Sort
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
470 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
471 CALL SLASRT( 'I', N, D, INFO )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
472 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
473 ELSE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
474 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
475 * Use Selection Sort to minimize swaps of eigenvectors
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
476 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
477 DO 180 II = 2, N
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
478 I = II - 1
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
479 K = I
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
480 P = D( I )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
481 DO 170 J = II, N
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
482 IF( D( J ).LT.P ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
483 K = J
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
484 P = D( J )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
485 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
486 170 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
487 IF( K.NE.I ) THEN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
488 D( K ) = D( I )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
489 D( I ) = P
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
490 CALL SSWAP( N, Z( 1, I ), 1, Z( 1, K ), 1 )
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
491 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
492 180 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
493 END IF
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
494 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
495 190 CONTINUE
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
496 RETURN
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
497 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
498 * End of SSTEQR
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
499 *
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents:
diff changeset
500 END