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1993
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1 // ColumnVector manipulations. |
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458
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2 /* |
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3 |
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4 Copyright (C) 1996, 1997 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> |
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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 bool |
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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 mx_inline_equal (data (), a.data (), len); |
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60 } |
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61 |
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62 bool |
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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 (mx_inline_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 (mx_inline_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 // matrix by column vector -> column vector operations |
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167 |
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168 ColumnVector |
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169 operator * (const Matrix& m, const ColumnVector& a) |
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170 { |
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171 ColumnVector retval; |
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172 |
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173 int nr = m.rows (); |
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174 int nc = m.cols (); |
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175 |
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176 int a_len = a.length (); |
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177 |
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178 if (nc != a_len) |
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179 gripe_nonconformant ("operator *", nr, nc, a_len, 1); |
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180 else |
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181 { |
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182 if (nr == 0 || nc == 0) |
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183 retval.resize (nr, 0.0); |
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184 else |
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185 { |
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186 int ld = nr; |
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187 |
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188 retval.resize (nr); |
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189 double *y = retval.fortran_vec (); |
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190 |
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191 F77_XFCN (dgemv, DGEMV, ("N", nr, nc, 1.0, m.data (), ld, |
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192 a.data (), 1, 0.0, y, 1, 1L)); |
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193 |
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194 if (f77_exception_encountered) |
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195 (*current_liboctave_error_handler) |
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196 ("unrecoverable error in dgemv"); |
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197 } |
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198 } |
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199 |
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200 return retval; |
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201 } |
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202 |
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203 // diagonal matrix by column vector -> column vector operations |
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204 |
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205 ColumnVector |
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206 operator * (const DiagMatrix& m, const ColumnVector& a) |
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207 { |
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208 ColumnVector retval; |
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209 |
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210 int nr = m.rows (); |
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211 int nc = m.cols (); |
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212 |
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213 int a_len = a.length (); |
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214 |
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215 if (nc != a_len) |
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216 gripe_nonconformant ("operator *", nr, nc, a_len, 1); |
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217 else |
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218 { |
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219 if (nr == 0 || nc == 0) |
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220 retval.resize (nr, 0.0); |
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221 else |
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222 { |
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223 retval.resize (nr); |
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224 |
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225 for (int i = 0; i < a_len; i++) |
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226 retval.elem (i) = a.elem (i) * m.elem (i, i); |
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227 |
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228 for (int i = a_len; i < nr; i++) |
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229 retval.elem (i) = 0.0; |
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230 } |
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231 } |
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232 |
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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 ColumnVector |
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239 ColumnVector::map (d_d_Mapper f) const |
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240 { |
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241 ColumnVector 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 ColumnVector& |
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246 ColumnVector::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 (int 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 ColumnVector::min (void) const |
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258 { |
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259 int len = length (); |
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260 if (len == 0) |
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261 return 0.0; |
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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 (int 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 ColumnVector::max (void) const |
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274 { |
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275 int len = length (); |
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276 if (len == 0) |
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277 return 0.0; |
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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 (int 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 ColumnVector& a) |
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290 { |
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291 // int field_width = os.precision () + 7; |
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292 for (int i = 0; i < a.length (); i++) |
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293 os << /* setw (field_width) << */ a.elem (i) << "\n"; |
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294 return os; |
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295 } |
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296 |
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297 std::istream& |
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298 operator >> (std::istream& is, ColumnVector& a) |
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299 { |
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300 int len = a.length(); |
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301 |
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302 if (len < 1) |
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303 is.clear (std::ios::badbit); |
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304 else |
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305 { |
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306 double tmp; |
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307 for (int i = 0; i < len; i++) |
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308 { |
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309 is >> tmp; |
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310 if (is) |
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311 a.elem (i) = tmp; |
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312 else |
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313 break; |
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314 } |
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315 } |
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316 return is; |
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317 } |
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318 |
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319 /* |
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320 ;;; Local Variables: *** |
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321 ;;; mode: C++ *** |
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322 ;;; End: *** |
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323 */ |
