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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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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 double F77_FCN (ddot, DDOT) (const int&, const double*, const int&, |
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51 const double*, const int&); |
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52 } |
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53 |
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54 // Row Vector class. |
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55 |
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56 bool |
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57 RowVector::operator == (const RowVector& a) const |
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58 { |
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59 int len = length (); |
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60 if (len != a.length ()) |
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61 return 0; |
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62 return equal (data (), a.data (), len); |
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63 } |
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64 |
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65 bool |
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66 RowVector::operator != (const RowVector& a) const |
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67 { |
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68 return !(*this == a); |
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69 } |
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70 |
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71 RowVector& |
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72 RowVector::insert (const RowVector& a, int c) |
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73 { |
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74 int a_len = a.length (); |
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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 for (int i = 0; i < a_len; i++) |
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82 elem (c+i) = a.elem (i); |
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83 |
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84 return *this; |
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85 } |
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86 |
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87 RowVector& |
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88 RowVector::fill (double val) |
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89 { |
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90 int len = length (); |
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91 if (len > 0) |
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92 for (int i = 0; i < len; i++) |
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93 elem (i) = val; |
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94 return *this; |
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95 } |
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96 |
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97 RowVector& |
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98 RowVector::fill (double val, int c1, int c2) |
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99 { |
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100 int len = length (); |
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101 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len) |
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102 { |
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103 (*current_liboctave_error_handler) ("range error for fill"); |
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104 return *this; |
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105 } |
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106 |
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107 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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108 |
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109 for (int i = c1; i <= c2; i++) |
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110 elem (i) = val; |
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111 |
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112 return *this; |
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113 } |
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114 |
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115 RowVector |
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116 RowVector::append (const RowVector& a) const |
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117 { |
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118 int len = length (); |
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119 int nc_insert = len; |
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120 RowVector retval (len + a.length ()); |
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121 retval.insert (*this, 0); |
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122 retval.insert (a, nc_insert); |
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123 return retval; |
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124 } |
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125 |
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126 ColumnVector |
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127 RowVector::transpose (void) const |
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128 { |
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129 return ColumnVector (*this); |
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130 } |
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131 |
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132 RowVector |
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133 real (const ComplexRowVector& a) |
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134 { |
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135 int a_len = a.length (); |
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136 RowVector retval; |
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137 if (a_len > 0) |
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138 retval = RowVector (real_dup (a.data (), a_len), a_len); |
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139 return retval; |
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140 } |
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141 |
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142 RowVector |
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143 imag (const ComplexRowVector& a) |
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144 { |
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145 int a_len = a.length (); |
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146 RowVector retval; |
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147 if (a_len > 0) |
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148 retval = RowVector (imag_dup (a.data (), a_len), a_len); |
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149 return retval; |
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150 } |
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151 |
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152 RowVector |
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153 RowVector::extract (int c1, int c2) const |
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154 { |
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155 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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156 |
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157 int new_c = c2 - c1 + 1; |
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158 |
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159 RowVector result (new_c); |
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160 |
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161 for (int i = 0; i < new_c; i++) |
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162 result.elem (i) = elem (c1+i); |
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163 |
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164 return result; |
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165 } |
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166 |
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167 // row vector by row vector -> row vector operations |
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168 |
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169 RowVector& |
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170 RowVector::operator += (const RowVector& a) |
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171 { |
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172 int len = length (); |
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173 |
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174 int a_len = a.length (); |
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175 |
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176 if (len != a_len) |
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177 { |
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178 gripe_nonconformant ("operator +=", len, a_len); |
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179 return *this; |
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180 } |
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181 |
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182 if (len == 0) |
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183 return *this; |
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184 |
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185 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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186 |
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187 add2 (d, a.data (), len); |
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188 return *this; |
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189 } |
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190 |
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191 RowVector& |
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192 RowVector::operator -= (const RowVector& a) |
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193 { |
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194 int len = length (); |
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195 |
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196 int a_len = a.length (); |
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197 |
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198 if (len != a_len) |
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199 { |
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200 gripe_nonconformant ("operator -=", len, a_len); |
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201 return *this; |
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202 } |
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203 |
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204 if (len == 0) |
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205 return *this; |
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206 |
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207 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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208 |
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209 subtract2 (d, a.data (), len); |
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210 return *this; |
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211 } |
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212 |
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213 // row vector by matrix -> row vector |
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214 |
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215 RowVector |
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216 operator * (const RowVector& v, const Matrix& a) |
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217 { |
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218 RowVector retval; |
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219 |
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220 int len = v.length (); |
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221 |
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222 int a_nr = a.rows (); |
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223 int a_nc = a.cols (); |
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224 |
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225 if (a_nr != len) |
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226 gripe_nonconformant ("operator *", 1, len, a_nr, a_nc); |
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227 else |
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228 { |
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1947
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229 int a_nr = a.rows (); |
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230 int a_nc = a.cols (); |
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231 |
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232 if (len == 0) |
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233 retval.resize (a_nc, 0.0); |
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234 else |
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235 { |
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236 // Transpose A to form A'*x == (x'*A)' |
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237 |
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238 int ld = a_nr; |
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239 |
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240 retval.resize (a_nc); |
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241 double *y = retval.fortran_vec (); |
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242 |
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243 F77_XFCN (dgemv, DGEMV, ("T", a_nr, a_nc, 1.0, a.data (), |
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244 ld, v.data (), 1, 0.0, y, 1, 1L)); |
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245 |
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246 if (f77_exception_encountered) |
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247 (*current_liboctave_error_handler) |
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248 ("unrecoverable error in dgemv"); |
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249 } |
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250 } |
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251 |
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1947
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252 return retval; |
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253 } |
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254 |
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255 // other operations |
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256 |
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257 RowVector |
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258 map (d_d_Mapper f, const RowVector& a) |
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259 { |
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260 RowVector b (a); |
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261 b.map (f); |
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262 return b; |
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263 } |
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264 |
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265 RowVector |
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266 map (d_c_Mapper f, const ComplexRowVector& a) |
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267 { |
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268 int a_len = a.length (); |
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269 RowVector b (a_len); |
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270 for (int i = 0; i < a_len; i++) |
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271 b.elem (i) = f (a.elem (i)); |
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272 return b; |
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273 } |
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274 |
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458
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275 void |
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276 RowVector::map (d_d_Mapper f) |
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277 { |
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278 for (int i = 0; i < length (); i++) |
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279 elem (i) = f (elem (i)); |
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280 } |
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281 |
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282 double |
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283 RowVector::min (void) const |
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284 { |
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285 int len = length (); |
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286 if (len == 0) |
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287 return 0; |
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288 |
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289 double res = elem (0); |
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290 |
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291 for (int i = 1; i < len; i++) |
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292 if (elem (i) < res) |
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293 res = elem (i); |
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294 |
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295 return res; |
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296 } |
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297 |
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298 double |
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299 RowVector::max (void) const |
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300 { |
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301 int len = length (); |
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302 if (len == 0) |
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303 return 0; |
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304 |
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305 double res = elem (0); |
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306 |
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307 for (int i = 1; i < len; i++) |
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308 if (elem (i) > res) |
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309 res = elem (i); |
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310 |
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311 return res; |
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312 } |
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313 |
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314 ostream& |
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315 operator << (ostream& os, const RowVector& a) |
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316 { |
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317 // int field_width = os.precision () + 7; |
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318 |
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319 for (int i = 0; i < a.length (); i++) |
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320 os << " " /* setw (field_width) */ << a.elem (i); |
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321 return os; |
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322 } |
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323 |
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324 istream& |
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325 operator >> (istream& is, RowVector& a) |
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326 { |
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327 int len = a.length(); |
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328 |
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329 if (len < 1) |
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330 is.clear (ios::badbit); |
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331 else |
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332 { |
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333 double tmp; |
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334 for (int i = 0; i < len; i++) |
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335 { |
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336 is >> tmp; |
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337 if (is) |
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338 a.elem (i) = tmp; |
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339 else |
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340 break; |
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341 } |
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342 } |
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343 return is; |
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344 } |
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345 |
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346 // other operations |
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347 |
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348 RowVector |
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349 linspace (double x1, double x2, int n) |
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350 { |
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351 RowVector retval; |
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352 |
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353 if (n > 0) |
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354 { |
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355 retval.resize (n); |
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356 double delta = (x2 - x1) / (n - 1); |
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357 retval.elem (0) = x1; |
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358 for (int i = 1; i < n-1; i++) |
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359 retval.elem (i) = x1 + i * delta; |
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360 retval.elem (n-1) = x2; |
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361 } |
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362 |
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363 return retval; |
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364 } |
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365 |
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366 // row vector by column vector -> scalar |
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367 |
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368 double |
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369 operator * (const RowVector& v, const ColumnVector& a) |
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370 { |
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371 double retval = 0.0; |
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372 |
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373 int len = v.length (); |
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374 |
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375 int a_len = a.length (); |
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376 |
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377 if (len != a_len) |
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378 gripe_nonconformant ("operator *", len, a_len); |
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379 else if (len != 0) |
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380 retval = F77_FCN (ddot, DDOT) (len, v.data (), 1, a.data (), 1); |
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381 |
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382 return retval; |
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383 } |
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384 |
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385 Complex |
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386 operator * (const RowVector& v, const ComplexColumnVector& a) |
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387 { |
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388 ComplexRowVector tmp (v); |
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389 return tmp * a; |
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390 } |
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391 |
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458
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392 /* |
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393 ;;; Local Variables: *** |
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394 ;;; mode: C++ *** |
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395 ;;; End: *** |
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396 */ |
