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1 // ColumnVector manipulations. -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1996 John W. Eaton |
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <iostream.h> |
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33 |
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34 #include "f77-fcn.h" |
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35 #include "lo-error.h" |
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36 #include "mx-base.h" |
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37 #include "mx-inlines.cc" |
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38 #include "oct-cmplx.h" |
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39 |
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40 // Fortran functions we call. |
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41 |
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42 extern "C" |
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43 { |
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44 int F77_FCN (dgemv, DGEMV) (const char*, const int&, const int&, |
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45 const double&, const double*, |
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46 const int&, const double*, const int&, |
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47 const double&, double*, const int&, |
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48 long); |
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49 } |
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50 |
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51 // Column Vector class. |
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52 |
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53 int |
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54 ColumnVector::operator == (const ColumnVector& a) const |
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55 { |
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56 int len = length (); |
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57 if (len != a.length ()) |
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58 return 0; |
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59 return equal (data (), a.data (), len); |
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60 } |
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61 |
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62 int |
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63 ColumnVector::operator != (const ColumnVector& a) const |
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64 { |
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65 return !(*this == a); |
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66 } |
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67 |
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68 ColumnVector& |
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69 ColumnVector::insert (const ColumnVector& a, int r) |
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70 { |
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71 int a_len = a.length (); |
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72 if (r < 0 || r + a_len > length ()) |
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73 { |
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74 (*current_liboctave_error_handler) ("range error for insert"); |
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75 return *this; |
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76 } |
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77 |
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78 for (int i = 0; i < a_len; i++) |
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79 elem (r+i) = a.elem (i); |
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80 |
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81 return *this; |
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82 } |
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83 |
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84 ColumnVector& |
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85 ColumnVector::fill (double val) |
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86 { |
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87 int len = length (); |
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88 if (len > 0) |
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89 for (int i = 0; i < len; i++) |
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90 elem (i) = val; |
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91 return *this; |
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92 } |
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93 |
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94 ColumnVector& |
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95 ColumnVector::fill (double val, int r1, int r2) |
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96 { |
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97 int len = length (); |
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98 if (r1 < 0 || r2 < 0 || r1 >= len || r2 >= len) |
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99 { |
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100 (*current_liboctave_error_handler) ("range error for fill"); |
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101 return *this; |
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102 } |
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103 |
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104 if (r1 > r2) { int tmp = r1; r1 = r2; r2 = tmp; } |
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105 |
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106 for (int i = r1; i <= r2; i++) |
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107 elem (i) = val; |
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108 |
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109 return *this; |
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110 } |
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111 |
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112 ColumnVector |
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113 ColumnVector::stack (const ColumnVector& a) const |
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114 { |
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115 int len = length (); |
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116 int nr_insert = len; |
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117 ColumnVector retval (len + a.length ()); |
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118 retval.insert (*this, 0); |
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119 retval.insert (a, nr_insert); |
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120 return retval; |
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121 } |
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122 |
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123 RowVector |
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124 ColumnVector::transpose (void) const |
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125 { |
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126 return RowVector (*this); |
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127 } |
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128 |
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129 ColumnVector |
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130 real (const ComplexColumnVector& a) |
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131 { |
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132 int a_len = a.length (); |
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133 ColumnVector retval; |
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134 if (a_len > 0) |
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135 retval = ColumnVector (real_dup (a.data (), a_len), a_len); |
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136 return retval; |
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137 } |
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138 |
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139 ColumnVector |
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140 imag (const ComplexColumnVector& a) |
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141 { |
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142 int a_len = a.length (); |
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143 ColumnVector retval; |
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144 if (a_len > 0) |
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145 retval = ColumnVector (imag_dup (a.data (), a_len), a_len); |
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146 return retval; |
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147 } |
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148 |
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149 // resize is the destructive equivalent for this one |
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150 |
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151 ColumnVector |
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152 ColumnVector::extract (int r1, int r2) const |
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153 { |
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154 if (r1 > r2) { int tmp = r1; r1 = r2; r2 = tmp; } |
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155 |
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156 int new_r = r2 - r1 + 1; |
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157 |
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158 ColumnVector result (new_r); |
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159 |
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160 for (int i = 0; i < new_r; i++) |
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161 result.elem (i) = elem (r1+i); |
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162 |
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163 return result; |
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164 } |
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165 |
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166 // column vector by column vector -> column vector operations |
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167 |
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168 ColumnVector& |
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169 ColumnVector::operator += (const ColumnVector& a) |
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170 { |
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171 int len = length (); |
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172 if (len != a.length ()) |
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173 { |
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174 (*current_liboctave_error_handler) |
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175 ("nonconformant vector += operation attempted"); |
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176 return *this; |
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177 } |
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178 |
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179 if (len == 0) |
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180 return *this; |
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181 |
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182 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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183 |
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184 add2 (d, a.data (), len); |
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185 return *this; |
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186 } |
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187 |
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188 ColumnVector& |
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189 ColumnVector::operator -= (const ColumnVector& a) |
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190 { |
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191 int len = length (); |
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192 if (len != a.length ()) |
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193 { |
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194 (*current_liboctave_error_handler) |
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195 ("nonconformant vector -= operation attempted"); |
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196 return *this; |
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197 } |
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198 |
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199 if (len == 0) |
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200 return *this; |
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201 |
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202 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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203 |
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204 subtract2 (d, a.data (), len); |
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205 return *this; |
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206 } |
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207 |
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208 // matrix by column vector -> column vector operations |
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209 |
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210 ColumnVector |
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211 operator * (const Matrix& m, const ColumnVector& a) |
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212 { |
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213 ColumnVector retval; |
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214 |
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215 int nr = m.rows (); |
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216 int nc = m.cols (); |
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217 |
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218 if (nc != a.length ()) |
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219 (*current_liboctave_error_handler) |
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220 ("nonconformant matrix multiplication attempted"); |
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221 else |
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222 { |
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223 if (nr == 0 || nc == 0) |
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224 retval.resize (nr, 0.0); |
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225 else |
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226 { |
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227 int ld = nr; |
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228 |
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229 retval.resize (nr); |
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230 double *y = retval.fortran_vec (); |
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231 |
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232 F77_XFCN (dgemv, DGEMV, ("N", nr, nc, 1.0, m.data (), ld, |
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233 a.data (), 1, 0.0, y, 1, 1L)); |
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234 |
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235 if (f77_exception_encountered) |
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236 (*current_liboctave_error_handler) |
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237 ("unrecoverable error in dgemv"); |
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238 } |
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239 } |
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240 |
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241 return retval; |
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242 } |
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243 |
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244 // diagonal matrix by column vector -> column vector operations |
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245 |
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246 ColumnVector |
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247 operator * (const DiagMatrix& m, const ColumnVector& a) |
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248 { |
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249 ColumnVector retval; |
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250 |
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251 int nr = m.rows (); |
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252 int nc = m.cols (); |
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253 |
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254 int a_len = a.length (); |
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255 |
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256 if (nc != a_len) |
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257 (*current_liboctave_error_handler) |
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258 ("nonconformant matrix multiplication attempted"); |
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259 else |
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260 { |
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261 if (nr == 0 || nc == 0) |
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262 retval.resize (nr, 0.0); |
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263 else |
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264 { |
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265 retval.resize (nr); |
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266 |
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267 for (int i = 0; i < a_len; i++) |
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268 retval.elem (i) = a.elem (i) * m.elem (i, i); |
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269 |
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270 for (int i = a_len; i < nr; i++) |
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271 retval.elem (i) = 0.0; |
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272 } |
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273 } |
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274 |
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275 return retval; |
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276 } |
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277 |
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278 // other operations |
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279 |
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280 ColumnVector |
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281 map (d_d_Mapper f, const ColumnVector& a) |
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282 { |
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283 ColumnVector b (a); |
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284 b.map (f); |
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285 return b; |
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286 } |
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287 |
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288 ColumnVector |
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289 map (d_c_Mapper f, const ComplexColumnVector& a) |
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290 { |
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291 int a_len = a.length (); |
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292 ColumnVector b (a_len); |
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293 for (int i = 0; i < a_len; i++) |
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294 b.elem (i) = f (a.elem (i)); |
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295 return b; |
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296 } |
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297 |
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298 void |
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299 ColumnVector::map (d_d_Mapper f) |
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300 { |
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301 for (int i = 0; i < length (); i++) |
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302 elem (i) = f (elem (i)); |
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303 } |
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304 |
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305 double |
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306 ColumnVector::min (void) const |
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307 { |
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308 int len = length (); |
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309 if (len == 0) |
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310 return 0.0; |
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311 |
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312 double res = elem (0); |
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313 |
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314 for (int i = 1; i < len; i++) |
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315 if (elem (i) < res) |
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316 res = elem (i); |
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317 |
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318 return res; |
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319 } |
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320 |
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321 double |
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322 ColumnVector::max (void) const |
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323 { |
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324 int len = length (); |
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325 if (len == 0) |
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326 return 0.0; |
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327 |
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328 double res = elem (0); |
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329 |
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330 for (int i = 1; i < len; i++) |
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331 if (elem (i) > res) |
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332 res = elem (i); |
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333 |
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334 return res; |
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335 } |
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336 |
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337 ostream& |
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338 operator << (ostream& os, const ColumnVector& a) |
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339 { |
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340 // int field_width = os.precision () + 7; |
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341 for (int i = 0; i < a.length (); i++) |
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342 os << /* setw (field_width) << */ a.elem (i) << "\n"; |
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343 return os; |
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344 } |
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345 |
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346 istream& |
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347 operator >> (istream& is, ColumnVector& a) |
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348 { |
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349 int len = a.length(); |
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350 |
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351 if (len < 1) |
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352 is.clear (ios::badbit); |
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353 else |
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354 { |
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355 double tmp; |
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356 for (int i = 0; i < len; i++) |
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357 { |
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358 is >> tmp; |
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359 if (is) |
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360 a.elem (i) = tmp; |
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361 else |
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362 break; |
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363 } |
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364 } |
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365 return is; |
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366 } |
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367 |
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368 /* |
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369 ;;; Local Variables: *** |
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370 ;;; mode: C++ *** |
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371 ;;; page-delimiter: "^/\\*" *** |
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372 ;;; End: *** |
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373 */ |
