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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <string> |
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28 |
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29 #include "CmplxSCHUR.h" |
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30 #include "dbleSCHUR.h" |
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31 |
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32 #include "defun-dld.h" |
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33 #include "error.h" |
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34 #include "gripes.h" |
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35 #include "help.h" |
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36 #include "oct-obj.h" |
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37 #include "utils.h" |
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38 |
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39 DEFUN_DLD (schur, args, nargout, |
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40 "[U, S] = schur (A) or S = schur (A)\n\ |
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41 \n\ |
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42 or, for ordered Schur:\n\ |
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43 \n\ |
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44 [U, S] = schur (A, TYPE) or S = schur (A, TYPE)\n\ |
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45 where TYPE is a string that begins with one of the following\n\ |
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46 characters:\n\ |
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47 \n\ |
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48 A = continuous time poles\n\ |
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49 D = discrete time poles\n\ |
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50 U = unordered schur (default)") |
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51 { |
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52 octave_value_list retval; |
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53 |
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54 int nargin = args.length (); |
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55 |
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56 if (nargin < 1 || nargin > 2 || nargout > 2) |
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57 { |
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58 print_usage ("schur"); |
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59 return retval; |
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60 } |
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61 |
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62 octave_value arg = args(0); |
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63 |
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64 string ord; |
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65 |
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66 if (nargin == 2) |
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67 { |
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68 ord = args(1).string_value (); |
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69 |
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70 if (error_state) |
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71 { |
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72 error ("schur: expecting string as second argument"); |
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73 return retval; |
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74 } |
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75 } |
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76 |
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77 char ord_char = ord.empty () ? 'U' : ord[0]; |
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78 |
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79 if (ord_char != 'U' && ord_char != 'A' && ord_char != 'D' |
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80 && ord_char != 'u' && ord_char != 'a' && ord_char != 'd') |
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81 { |
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82 warning ("schur: incorrect ordered schur argument `%c'", |
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83 ord.c_str ()); |
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84 return retval; |
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85 } |
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86 |
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87 int nr = arg.rows (); |
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88 int nc = arg.columns (); |
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89 |
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90 int arg_is_empty = empty_arg ("schur", nr, nc); |
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91 |
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92 if (arg_is_empty < 0) |
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93 return retval; |
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94 else if (arg_is_empty > 0) |
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95 return octave_value_list (2, Matrix ()); |
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96 |
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97 if (nr != nc) |
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98 { |
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99 gripe_square_matrix_required ("schur"); |
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100 return retval; |
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101 } |
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102 |
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103 if (arg.is_real_type ()) |
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104 { |
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105 Matrix tmp = arg.matrix_value (); |
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106 |
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107 if (! error_state) |
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108 { |
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109 SCHUR result (tmp, ord); |
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110 |
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111 if (nargout == 0 || nargout == 1) |
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112 { |
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113 retval(0) = result.schur_matrix (); |
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114 } |
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115 else |
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116 { |
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117 retval(1) = result.schur_matrix (); |
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118 retval(0) = result.unitary_matrix (); |
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119 } |
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120 } |
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121 } |
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122 else if (arg.is_complex_type ()) |
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123 { |
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124 ComplexMatrix ctmp = arg.complex_matrix_value (); |
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125 |
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126 if (! error_state) |
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127 { |
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128 ComplexSCHUR result (ctmp, ord); |
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129 |
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130 if (nargout == 0 || nargout == 1) |
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131 { |
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132 retval(0) = result.schur_matrix (); |
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133 } |
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134 else |
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135 { |
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136 retval(1) = result.schur_matrix (); |
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137 retval(0) = result.unitary_matrix (); |
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138 } |
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139 } |
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140 } |
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141 else |
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142 { |
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143 gripe_wrong_type_arg ("schur", arg); |
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144 } |
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145 |
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146 return retval; |
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147 } |
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148 |
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149 /* |
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150 ;;; Local Variables: *** |
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151 ;;; mode: C++ *** |
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152 ;;; End: *** |
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153 */ |
