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1 // RowVector manipulations. -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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 <Complex.h> |
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35 |
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36 #include "f77-uscore.h" |
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37 #include "lo-error.h" |
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38 #include "mx-base.h" |
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39 #include "mx-inlines.cc" |
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40 |
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41 // Fortran functions we call. |
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42 |
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43 extern "C" |
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44 { |
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45 int F77_FCN (dgemv, DGEMV) (const char*, const int&, const int&, |
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46 const double&, const double*, |
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47 const int&, const double*, const int&, |
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48 const double&, double*, const int&, |
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49 long); |
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50 |
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51 double F77_FCN (ddot, DDOT) (const int&, const double*, const int&, |
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52 const double*, const int&); |
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53 } |
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54 |
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55 // Row Vector class. |
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56 |
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57 int |
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58 RowVector::operator == (const RowVector& a) const |
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59 { |
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60 int len = length (); |
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61 if (len != a.length ()) |
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62 return 0; |
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63 return equal (data (), a.data (), len); |
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64 } |
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65 |
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66 int |
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67 RowVector::operator != (const RowVector& a) const |
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68 { |
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69 return !(*this == a); |
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70 } |
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71 |
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72 RowVector& |
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73 RowVector::insert (const RowVector& a, int c) |
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74 { |
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75 int a_len = a.length (); |
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76 if (c < 0 || c + a_len - 1 > length ()) |
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77 { |
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78 (*current_liboctave_error_handler) ("range error for insert"); |
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79 return *this; |
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80 } |
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81 |
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82 for (int i = 0; i < a_len; i++) |
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83 elem (c+i) = a.elem (i); |
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84 |
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85 return *this; |
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86 } |
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87 |
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88 RowVector& |
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89 RowVector::fill (double val) |
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90 { |
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91 int len = length (); |
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92 if (len > 0) |
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93 for (int i = 0; i < len; i++) |
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94 elem (i) = val; |
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95 return *this; |
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96 } |
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97 |
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98 RowVector& |
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99 RowVector::fill (double val, int c1, int c2) |
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100 { |
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101 int len = length (); |
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102 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len) |
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103 { |
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104 (*current_liboctave_error_handler) ("range error for fill"); |
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105 return *this; |
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106 } |
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107 |
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108 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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109 |
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110 for (int i = c1; i <= c2; i++) |
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111 elem (i) = val; |
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112 |
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113 return *this; |
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114 } |
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115 |
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116 RowVector |
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117 RowVector::append (const RowVector& a) const |
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118 { |
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119 int len = length (); |
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120 int nc_insert = len; |
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121 RowVector retval (len + a.length ()); |
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122 retval.insert (*this, 0); |
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123 retval.insert (a, nc_insert); |
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124 return retval; |
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125 } |
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126 |
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127 ColumnVector |
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128 RowVector::transpose (void) const |
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129 { |
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130 int len = length (); |
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131 return ColumnVector (dup (data (), len), len); |
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132 } |
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133 |
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134 RowVector |
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135 real (const ComplexRowVector& a) |
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136 { |
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137 int a_len = a.length (); |
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138 RowVector retval; |
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139 if (a_len > 0) |
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140 retval = RowVector (real_dup (a.data (), a_len), a_len); |
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141 return retval; |
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142 } |
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143 |
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144 RowVector |
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145 imag (const ComplexRowVector& a) |
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146 { |
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147 int a_len = a.length (); |
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148 RowVector retval; |
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149 if (a_len > 0) |
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150 retval = RowVector (imag_dup (a.data (), a_len), a_len); |
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151 return retval; |
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152 } |
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153 |
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154 RowVector |
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155 RowVector::extract (int c1, int c2) const |
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156 { |
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157 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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158 |
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159 int new_c = c2 - c1 + 1; |
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160 |
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161 RowVector result (new_c); |
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162 |
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163 for (int i = 0; i < new_c; i++) |
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164 result.elem (i) = elem (c1+i); |
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165 |
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166 return result; |
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167 } |
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168 |
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169 // row vector by row vector -> row vector operations |
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170 |
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171 RowVector& |
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172 RowVector::operator += (const RowVector& a) |
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173 { |
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174 int len = length (); |
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175 if (len != a.length ()) |
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176 { |
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177 (*current_liboctave_error_handler) |
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178 ("nonconformant vector += operation attempted"); |
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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 if (len != a.length ()) |
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196 { |
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197 (*current_liboctave_error_handler) |
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198 ("nonconformant vector -= operation attempted"); |
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199 return *this; |
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200 } |
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201 |
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202 if (len == 0) |
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203 return *this; |
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204 |
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205 double *d = fortran_vec (); // Ensures only one reference to my privates! |
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206 |
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207 subtract2 (d, a.data (), len); |
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208 return *this; |
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209 } |
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210 |
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211 // row vector by matrix -> row vector |
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212 |
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213 RowVector |
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214 operator * (const RowVector& v, const Matrix& a) |
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215 { |
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216 int len = v.length (); |
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217 if (a.rows () != len) |
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218 { |
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219 (*current_liboctave_error_handler) |
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220 ("nonconformant vector multiplication attempted"); |
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221 return RowVector (); |
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222 } |
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223 |
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224 if (len == 0 || a.cols () == 0) |
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225 return RowVector (0); |
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226 |
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227 // Transpose A to form A'*x == (x'*A)' |
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228 |
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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 int ld = a_nr; |
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233 |
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234 double *y = new double [len]; |
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235 |
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236 F77_FCN (dgemv, DGEMV) ("T", a_nc, a_nr, 1.0, a.data (), ld, |
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237 v.data (), 1, 0.0, y, 1, 1L); |
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238 |
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239 return RowVector (y, len); |
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240 } |
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241 |
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242 // other operations |
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243 |
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244 RowVector |
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245 map (d_d_Mapper f, const RowVector& a) |
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246 { |
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247 RowVector b (a); |
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248 b.map (f); |
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249 return b; |
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250 } |
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251 |
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252 RowVector |
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253 map (d_c_Mapper f, const ComplexRowVector& a) |
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254 { |
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255 int a_len = a.length (); |
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256 RowVector b (a_len); |
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257 for (int i = 0; i < a_len; i++) |
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258 b.elem (i) = f (a.elem (i)); |
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259 return b; |
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260 } |
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261 |
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262 void |
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263 RowVector::map (d_d_Mapper f) |
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264 { |
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265 for (int i = 0; i < length (); i++) |
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266 elem (i) = f (elem (i)); |
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267 } |
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268 |
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269 double |
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270 RowVector::min (void) const |
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271 { |
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272 int len = length (); |
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273 if (len == 0) |
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274 return 0; |
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275 |
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276 double res = elem (0); |
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277 |
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278 for (int i = 1; i < len; i++) |
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279 if (elem (i) < res) |
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280 res = elem (i); |
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281 |
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282 return res; |
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283 } |
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284 |
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285 double |
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286 RowVector::max (void) const |
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287 { |
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288 int len = length (); |
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289 if (len == 0) |
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290 return 0; |
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291 |
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292 double res = elem (0); |
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293 |
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294 for (int i = 1; i < len; i++) |
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295 if (elem (i) > res) |
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296 res = elem (i); |
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297 |
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298 return res; |
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299 } |
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300 |
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301 ostream& |
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302 operator << (ostream& os, const RowVector& a) |
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303 { |
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304 // int field_width = os.precision () + 7; |
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305 |
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306 for (int i = 0; i < a.length (); i++) |
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307 os << " " /* setw (field_width) */ << a.elem (i); |
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308 return os; |
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309 } |
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310 |
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311 istream& |
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312 operator >> (istream& is, RowVector& a) |
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313 { |
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314 int len = a.length(); |
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315 |
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316 if (len < 1) |
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317 is.clear (ios::badbit); |
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318 else |
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319 { |
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320 double tmp; |
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321 for (int i = 0; i < len; i++) |
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322 { |
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323 is >> tmp; |
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324 if (is) |
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325 a.elem (i) = tmp; |
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326 else |
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327 break; |
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328 } |
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329 } |
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330 return is; |
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331 } |
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332 |
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333 // other operations |
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334 |
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335 RowVector |
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336 linspace (double x1, double x2, int n) |
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337 { |
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338 RowVector retval; |
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339 |
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340 if (n > 0) |
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341 { |
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342 retval.resize (n); |
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343 double delta = (x2 - x1) / (n - 1); |
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344 retval.elem (0) = x1; |
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345 for (int i = 1; i < n-1; i++) |
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346 retval.elem (i) = x1 + i * delta; |
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347 retval.elem (n-1) = x2; |
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348 } |
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349 |
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350 return retval; |
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351 } |
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352 |
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353 // row vector by column vector -> scalar |
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354 |
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355 double |
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356 operator * (const RowVector& v, const ColumnVector& a) |
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357 { |
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358 int len = v.length (); |
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359 if (len != a.length ()) |
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360 { |
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361 (*current_liboctave_error_handler) |
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362 ("nonconformant vector multiplication attempted"); |
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363 return 0.0; |
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364 } |
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365 |
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366 return F77_FCN (ddot, DDOT) (len, v.data (), 1, a.data (), 1); |
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367 } |
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368 |
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369 Complex |
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370 operator * (const RowVector& v, const ComplexColumnVector& a) |
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371 { |
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372 ComplexRowVector tmp (v); |
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373 return tmp * a; |
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374 } |
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375 |
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458
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376 /* |
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377 ;;; Local Variables: *** |
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378 ;;; mode: C++ *** |
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379 ;;; page-delimiter: "^/\\*" *** |
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380 ;;; End: *** |
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381 */ |
