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1993
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1 // RowVector manipulations. |
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458
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2 /* |
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3 |
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2847
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4 Copyright (C) 1996, 1997 John W. Eaton |
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458
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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21 02110-1301, USA. |
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22 |
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23 */ |
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24 |
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25 #ifdef HAVE_CONFIG_H |
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26 #include <config.h> |
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27 #endif |
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28 |
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29 #include <iostream> |
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30 |
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31 #include "Array-util.h" |
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32 #include "f77-fcn.h" |
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33 #include "lo-error.h" |
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34 #include "mx-base.h" |
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35 #include "mx-inlines.cc" |
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36 #include "oct-cmplx.h" |
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37 |
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38 // Fortran functions we call. |
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39 |
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40 extern "C" |
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41 { |
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42 F77_RET_T |
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43 F77_FUNC (dgemv, DGEMV) (F77_CONST_CHAR_ARG_DECL, |
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44 const octave_idx_type&, const octave_idx_type&, const double&, |
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45 const double*, const octave_idx_type&, const double*, |
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46 const octave_idx_type&, const double&, double*, const octave_idx_type& |
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47 F77_CHAR_ARG_LEN_DECL); |
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48 F77_RET_T |
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49 F77_FUNC (xddot, XDDOT) (const octave_idx_type&, const double*, const octave_idx_type&, |
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50 const double*, const octave_idx_type&, double&); |
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51 } |
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52 |
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53 // Row Vector class. |
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54 |
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55 bool |
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56 RowVector::operator == (const RowVector& a) const |
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57 { |
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58 octave_idx_type len = length (); |
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59 if (len != a.length ()) |
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60 return 0; |
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61 return mx_inline_equal (data (), a.data (), len); |
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62 } |
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63 |
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64 bool |
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65 RowVector::operator != (const RowVector& a) const |
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66 { |
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67 return !(*this == a); |
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68 } |
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69 |
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70 RowVector& |
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71 RowVector::insert (const RowVector& a, octave_idx_type c) |
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72 { |
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73 octave_idx_type a_len = a.length (); |
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74 |
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75 if (c < 0 || c + a_len > length ()) |
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76 { |
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77 (*current_liboctave_error_handler) ("range error for insert"); |
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78 return *this; |
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79 } |
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80 |
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81 if (a_len > 0) |
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82 { |
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83 make_unique (); |
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84 |
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85 for (octave_idx_type i = 0; i < a_len; i++) |
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86 xelem (c+i) = a.elem (i); |
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87 } |
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88 |
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89 return *this; |
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90 } |
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91 |
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92 RowVector& |
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93 RowVector::fill (double val) |
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94 { |
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95 octave_idx_type len = length (); |
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96 |
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97 if (len > 0) |
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98 { |
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99 make_unique (); |
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100 |
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101 for (octave_idx_type i = 0; i < len; i++) |
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102 xelem (i) = val; |
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103 } |
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104 |
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105 return *this; |
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106 } |
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107 |
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108 RowVector& |
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109 RowVector::fill (double val, octave_idx_type c1, octave_idx_type c2) |
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110 { |
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111 octave_idx_type len = length (); |
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112 |
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113 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len) |
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114 { |
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115 (*current_liboctave_error_handler) ("range error for fill"); |
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116 return *this; |
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117 } |
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118 |
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119 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; } |
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120 |
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121 if (c2 >= c1) |
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122 { |
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123 make_unique (); |
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124 |
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125 for (octave_idx_type i = c1; i <= c2; i++) |
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126 xelem (i) = val; |
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127 } |
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128 |
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129 return *this; |
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130 } |
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131 |
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132 RowVector |
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133 RowVector::append (const RowVector& a) const |
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134 { |
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135 octave_idx_type len = length (); |
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136 octave_idx_type nc_insert = len; |
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137 RowVector retval (len + a.length ()); |
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138 retval.insert (*this, 0); |
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139 retval.insert (a, nc_insert); |
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140 return retval; |
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141 } |
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142 |
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143 ColumnVector |
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144 RowVector::transpose (void) const |
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145 { |
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146 return ColumnVector (*this); |
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147 } |
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148 |
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149 RowVector |
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150 real (const ComplexRowVector& a) |
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151 { |
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152 octave_idx_type a_len = a.length (); |
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153 RowVector retval; |
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154 if (a_len > 0) |
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155 retval = RowVector (mx_inline_real_dup (a.data (), a_len), a_len); |
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156 return retval; |
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157 } |
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158 |
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159 RowVector |
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160 imag (const ComplexRowVector& a) |
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161 { |
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162 octave_idx_type a_len = a.length (); |
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163 RowVector retval; |
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164 if (a_len > 0) |
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165 retval = RowVector (mx_inline_imag_dup (a.data (), a_len), a_len); |
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166 return retval; |
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167 } |
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168 |
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169 RowVector |
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170 RowVector::extract (octave_idx_type c1, octave_idx_type c2) const |
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171 { |
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172 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; } |
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173 |
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174 octave_idx_type new_c = c2 - c1 + 1; |
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175 |
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176 RowVector result (new_c); |
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177 |
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178 for (octave_idx_type i = 0; i < new_c; i++) |
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179 result.xelem (i) = elem (c1+i); |
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180 |
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181 return result; |
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182 } |
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183 |
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184 RowVector |
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185 RowVector::extract_n (octave_idx_type r1, octave_idx_type n) const |
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186 { |
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187 RowVector result (n); |
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188 |
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189 for (octave_idx_type i = 0; i < n; i++) |
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190 result.xelem (i) = elem (r1+i); |
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191 |
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192 return result; |
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193 } |
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194 |
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195 // row vector by matrix -> row vector |
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196 |
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197 RowVector |
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198 operator * (const RowVector& v, const Matrix& a) |
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199 { |
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1947
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200 RowVector retval; |
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201 |
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202 octave_idx_type len = v.length (); |
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1947
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203 |
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204 octave_idx_type a_nr = a.rows (); |
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205 octave_idx_type a_nc = a.cols (); |
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206 |
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207 if (a_nr != len) |
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208 gripe_nonconformant ("operator *", 1, len, a_nr, a_nc); |
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1947
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209 else |
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210 { |
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1947
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211 if (len == 0) |
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212 retval.resize (a_nc, 0.0); |
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213 else |
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214 { |
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215 // Transpose A to form A'*x == (x'*A)' |
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216 |
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217 octave_idx_type ld = a_nr; |
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218 |
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219 retval.resize (a_nc); |
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220 double *y = retval.fortran_vec (); |
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221 |
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222 F77_XFCN (dgemv, DGEMV, (F77_CONST_CHAR_ARG2 ("T", 1), |
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223 a_nr, a_nc, 1.0, a.data (), |
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224 ld, v.data (), 1, 0.0, y, 1 |
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225 F77_CHAR_ARG_LEN (1))); |
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1947
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226 |
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227 if (f77_exception_encountered) |
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228 (*current_liboctave_error_handler) |
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229 ("unrecoverable error in dgemv"); |
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230 } |
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231 } |
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232 |
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1947
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233 return retval; |
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234 } |
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235 |
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236 // other operations |
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237 |
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238 RowVector |
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239 RowVector::map (d_d_Mapper f) const |
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240 { |
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241 RowVector b (*this); |
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242 return b.apply (f); |
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243 } |
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244 |
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245 RowVector& |
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246 RowVector::apply (d_d_Mapper f) |
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247 { |
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248 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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249 |
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250 for (octave_idx_type i = 0; i < length (); i++) |
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251 d[i] = f (d[i]); |
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252 |
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253 return *this; |
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254 } |
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255 |
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256 double |
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257 RowVector::min (void) const |
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258 { |
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259 octave_idx_type len = length (); |
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260 if (len == 0) |
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261 return 0; |
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262 |
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263 double res = elem (0); |
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264 |
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265 for (octave_idx_type i = 1; i < len; i++) |
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266 if (elem (i) < res) |
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267 res = elem (i); |
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268 |
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269 return res; |
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270 } |
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271 |
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272 double |
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273 RowVector::max (void) const |
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274 { |
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275 octave_idx_type len = length (); |
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276 if (len == 0) |
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277 return 0; |
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278 |
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279 double res = elem (0); |
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280 |
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281 for (octave_idx_type i = 1; i < len; i++) |
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282 if (elem (i) > res) |
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283 res = elem (i); |
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284 |
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285 return res; |
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286 } |
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287 |
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288 std::ostream& |
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289 operator << (std::ostream& os, const RowVector& a) |
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290 { |
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291 // int field_width = os.precision () + 7; |
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292 |
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293 for (octave_idx_type i = 0; i < a.length (); i++) |
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294 os << " " /* setw (field_width) */ << a.elem (i); |
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295 return os; |
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296 } |
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297 |
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298 std::istream& |
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299 operator >> (std::istream& is, RowVector& a) |
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300 { |
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301 octave_idx_type len = a.length(); |
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302 |
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303 if (len < 1) |
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304 is.clear (std::ios::badbit); |
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305 else |
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306 { |
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307 double tmp; |
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308 for (octave_idx_type i = 0; i < len; i++) |
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309 { |
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310 is >> tmp; |
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311 if (is) |
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312 a.elem (i) = tmp; |
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313 else |
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314 break; |
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315 } |
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316 } |
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532
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317 return is; |
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318 } |
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319 |
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320 // other operations |
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321 |
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322 RowVector |
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323 linspace (double x1, double x2, octave_idx_type n) |
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324 { |
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325 RowVector retval; |
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326 |
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3322
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327 if (n > 1) |
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328 { |
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329 retval.resize (n); |
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330 double delta = (x2 - x1) / (n - 1); |
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331 retval.elem (0) = x1; |
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332 for (octave_idx_type i = 1; i < n-1; i++) |
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333 retval.elem (i) = x1 + i * delta; |
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334 retval.elem (n-1) = x2; |
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335 } |
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336 else if (n == 1) |
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337 { |
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338 retval.resize (1); |
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339 retval.elem (0) = x2; |
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3322
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340 } |
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341 else |
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342 (*current_liboctave_error_handler) |
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343 ("linspace: npoints must be greater than 0"); |
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344 |
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345 return retval; |
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346 } |
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347 |
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348 // row vector by column vector -> scalar |
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349 |
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350 double |
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351 operator * (const RowVector& v, const ColumnVector& a) |
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352 { |
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353 double retval = 0.0; |
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354 |
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355 octave_idx_type len = v.length (); |
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356 |
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357 octave_idx_type a_len = a.length (); |
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358 |
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359 if (len != a_len) |
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360 gripe_nonconformant ("operator *", len, a_len); |
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361 else if (len != 0) |
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362 F77_FUNC (xddot, XDDOT) (len, v.data (), 1, a.data (), 1, retval); |
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363 |
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1947
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364 return retval; |
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365 } |
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366 |
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367 Complex |
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368 operator * (const RowVector& v, const ComplexColumnVector& a) |
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369 { |
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370 ComplexRowVector tmp (v); |
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371 return tmp * a; |
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372 } |
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373 |
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458
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374 /* |
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375 ;;; Local Variables: *** |
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376 ;;; mode: C++ *** |
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377 ;;; End: *** |
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378 */ |
