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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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1882
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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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1296
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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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1192
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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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1847
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34 #include "f77-fcn.h" |
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1368
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35 #include "lo-error.h" |
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458
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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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1253
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44 int F77_FCN (zgemv, ZGEMV) (const char*, const int&, const int&, |
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45 const Complex&, const Complex*, |
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46 const int&, const Complex*, const int&, |
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47 const Complex&, Complex*, const int&, |
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48 long); |
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458
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49 } |
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50 |
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1360
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51 // Complex Row Vector class |
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52 |
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53 ComplexRowVector::ComplexRowVector (const RowVector& a) |
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54 : MArray<Complex> (a.length ()) |
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458
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55 { |
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56 for (int i = 0; i < length (); i++) |
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57 elem (i) = a.elem (i); |
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58 } |
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59 |
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2386
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60 bool |
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458
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61 ComplexRowVector::operator == (const ComplexRowVector& a) const |
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62 { |
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63 int len = length (); |
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64 if (len != a.length ()) |
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65 return 0; |
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66 return equal (data (), a.data (), len); |
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67 } |
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68 |
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69 bool |
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70 ComplexRowVector::operator != (const ComplexRowVector& a) const |
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71 { |
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72 return !(*this == a); |
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73 } |
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74 |
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75 // destructive insert/delete/reorder operations |
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76 |
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77 ComplexRowVector& |
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78 ComplexRowVector::insert (const RowVector& a, int c) |
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79 { |
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80 int a_len = a.length (); |
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81 if (c < 0 || c + a_len > length ()) |
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82 { |
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83 (*current_liboctave_error_handler) ("range error for insert"); |
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84 return *this; |
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85 } |
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86 |
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87 for (int i = 0; i < a_len; i++) |
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88 elem (c+i) = a.elem (i); |
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89 |
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90 return *this; |
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91 } |
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92 |
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93 ComplexRowVector& |
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94 ComplexRowVector::insert (const ComplexRowVector& a, int c) |
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95 { |
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96 int a_len = a.length (); |
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97 if (c < 0 || c + a_len > length ()) |
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98 { |
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99 (*current_liboctave_error_handler) ("range error for insert"); |
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100 return *this; |
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101 } |
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102 |
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103 for (int i = 0; i < a_len; i++) |
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104 elem (c+i) = a.elem (i); |
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105 |
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106 return *this; |
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107 } |
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108 |
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109 ComplexRowVector& |
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110 ComplexRowVector::fill (double val) |
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111 { |
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112 int len = length (); |
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113 if (len > 0) |
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114 for (int i = 0; i < len; i++) |
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115 elem (i) = val; |
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116 return *this; |
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117 } |
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118 |
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119 ComplexRowVector& |
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120 ComplexRowVector::fill (const Complex& val) |
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121 { |
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122 int len = length (); |
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123 if (len > 0) |
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124 for (int i = 0; i < len; i++) |
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125 elem (i) = val; |
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126 return *this; |
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127 } |
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128 |
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129 ComplexRowVector& |
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130 ComplexRowVector::fill (double val, int c1, int c2) |
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131 { |
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132 int len = length (); |
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133 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len) |
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134 { |
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135 (*current_liboctave_error_handler) ("range error for fill"); |
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136 return *this; |
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137 } |
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138 |
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139 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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140 |
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141 for (int i = c1; i <= c2; i++) |
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142 elem (i) = val; |
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143 |
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144 return *this; |
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145 } |
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146 |
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147 ComplexRowVector& |
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148 ComplexRowVector::fill (const Complex& val, int c1, int c2) |
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149 { |
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150 int len = length (); |
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151 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len) |
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152 { |
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153 (*current_liboctave_error_handler) ("range error for fill"); |
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154 return *this; |
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155 } |
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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 for (int i = c1; i <= c2; i++) |
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160 elem (i) = val; |
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161 |
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162 return *this; |
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163 } |
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164 |
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165 ComplexRowVector |
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166 ComplexRowVector::append (const RowVector& a) const |
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167 { |
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168 int len = length (); |
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169 int nc_insert = len; |
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170 ComplexRowVector retval (len + a.length ()); |
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171 retval.insert (*this, 0); |
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172 retval.insert (a, nc_insert); |
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173 return retval; |
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174 } |
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175 |
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176 ComplexRowVector |
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177 ComplexRowVector::append (const ComplexRowVector& a) const |
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178 { |
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179 int len = length (); |
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180 int nc_insert = len; |
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181 ComplexRowVector retval (len + a.length ()); |
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182 retval.insert (*this, 0); |
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183 retval.insert (a, nc_insert); |
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184 return retval; |
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185 } |
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186 |
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187 ComplexColumnVector |
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188 ComplexRowVector::hermitian (void) const |
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189 { |
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190 int len = length (); |
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191 return ComplexColumnVector (conj_dup (data (), len), len); |
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192 } |
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193 |
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194 ComplexColumnVector |
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195 ComplexRowVector::transpose (void) const |
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196 { |
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1858
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197 return ComplexColumnVector (*this); |
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458
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198 } |
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199 |
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200 ComplexRowVector |
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201 conj (const ComplexRowVector& a) |
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202 { |
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203 int a_len = a.length (); |
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204 ComplexRowVector retval; |
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205 if (a_len > 0) |
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206 retval = ComplexRowVector (conj_dup (a.data (), a_len), a_len); |
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207 return retval; |
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208 } |
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209 |
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210 // resize is the destructive equivalent for this one |
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211 |
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212 ComplexRowVector |
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213 ComplexRowVector::extract (int c1, int c2) const |
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214 { |
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215 if (c1 > c2) { int tmp = c1; c1 = c2; c2 = tmp; } |
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216 |
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217 int new_c = c2 - c1 + 1; |
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218 |
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219 ComplexRowVector result (new_c); |
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220 |
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221 for (int i = 0; i < new_c; i++) |
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222 result.elem (i) = elem (c1+i); |
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223 |
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224 return result; |
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225 } |
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226 |
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227 // row vector by row vector -> row vector operations |
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228 |
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229 ComplexRowVector& |
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230 ComplexRowVector::operator += (const RowVector& a) |
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231 { |
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232 int len = length (); |
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233 |
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234 int a_len = a.length (); |
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235 |
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236 if (len != a_len) |
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237 { |
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2386
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238 gripe_nonconformant ("operator +=", len, a_len); |
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239 return *this; |
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240 } |
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241 |
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242 if (len == 0) |
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243 return *this; |
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244 |
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245 Complex *d = fortran_vec (); // Ensures only one reference to my privates! |
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246 |
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247 add2 (d, a.data (), len); |
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248 return *this; |
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249 } |
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250 |
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251 ComplexRowVector& |
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252 ComplexRowVector::operator -= (const RowVector& a) |
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253 { |
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254 int len = length (); |
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255 |
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256 int a_len = a.length (); |
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257 |
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258 if (len != a_len) |
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259 { |
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260 gripe_nonconformant ("operator -=", len, a_len); |
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458
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261 return *this; |
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262 } |
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263 |
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264 if (len == 0) |
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265 return *this; |
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266 |
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267 Complex *d = fortran_vec (); // Ensures only one reference to my privates! |
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268 |
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269 subtract2 (d, a.data (), len); |
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270 return *this; |
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271 } |
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272 |
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273 ComplexRowVector& |
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274 ComplexRowVector::operator += (const ComplexRowVector& a) |
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275 { |
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276 int len = length (); |
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277 |
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278 int a_len = a.length (); |
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279 |
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280 if (len != a_len) |
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458
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281 { |
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2386
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282 gripe_nonconformant ("operator +=", len, a_len); |
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458
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283 return *this; |
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284 } |
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285 |
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286 if (len == 0) |
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287 return *this; |
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288 |
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289 Complex *d = fortran_vec (); // Ensures only one reference to my privates! |
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290 |
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291 add2 (d, a.data (), len); |
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292 return *this; |
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293 } |
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294 |
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295 ComplexRowVector& |
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296 ComplexRowVector::operator -= (const ComplexRowVector& a) |
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297 { |
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298 int len = length (); |
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2386
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299 |
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300 int a_len = a.length (); |
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301 |
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302 if (len != a_len) |
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458
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303 { |
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2386
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304 gripe_nonconformant ("operator -=", len, a_len); |
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458
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305 return *this; |
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306 } |
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307 |
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308 if (len == 0) |
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309 return *this; |
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310 |
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311 Complex *d = fortran_vec (); // Ensures only one reference to my privates! |
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312 |
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313 subtract2 (d, a.data (), len); |
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314 return *this; |
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315 } |
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316 |
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317 // row vector by scalar -> row vector operations |
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318 |
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319 ComplexRowVector |
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320 operator + (const ComplexRowVector& v, double s) |
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321 { |
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322 int len = v.length (); |
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323 return ComplexRowVector (add (v.data (), len, s), len); |
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324 } |
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325 |
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326 ComplexRowVector |
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327 operator - (const ComplexRowVector& v, double s) |
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328 { |
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329 int len = v.length (); |
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330 return ComplexRowVector (subtract (v.data (), len, s), len); |
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331 } |
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332 |
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333 ComplexRowVector |
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334 operator * (const ComplexRowVector& v, double s) |
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335 { |
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336 int len = v.length (); |
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337 return ComplexRowVector (multiply (v.data (), len, s), len); |
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338 } |
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339 |
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340 ComplexRowVector |
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341 operator / (const ComplexRowVector& v, double s) |
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342 { |
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343 int len = v.length (); |
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344 return ComplexRowVector (divide (v.data (), len, s), len); |
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345 } |
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346 |
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1205
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347 ComplexRowVector |
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348 operator + (const RowVector& v, const Complex& s) |
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349 { |
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350 int len = v.length (); |
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351 return ComplexRowVector (add (v.data (), len, s), len); |
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352 } |
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353 |
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354 ComplexRowVector |
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355 operator - (const RowVector& v, const Complex& s) |
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356 { |
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357 int len = v.length (); |
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358 return ComplexRowVector (subtract (v.data (), len, s), len); |
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359 } |
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360 |
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361 ComplexRowVector |
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362 operator * (const RowVector& v, const Complex& s) |
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363 { |
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364 int len = v.length (); |
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365 return ComplexRowVector (multiply (v.data (), len, s), len); |
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366 } |
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367 |
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368 ComplexRowVector |
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369 operator / (const RowVector& v, const Complex& s) |
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370 { |
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371 int len = v.length (); |
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372 return ComplexRowVector (divide (v.data (), len, s), len); |
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373 } |
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374 |
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458
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375 // scalar by row vector -> row vector operations |
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376 |
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377 ComplexRowVector |
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378 operator + (double s, const ComplexRowVector& a) |
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379 { |
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380 int a_len = a.length (); |
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381 return ComplexRowVector (add (a.data (), a_len, s), a_len); |
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382 } |
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383 |
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384 ComplexRowVector |
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385 operator - (double s, const ComplexRowVector& a) |
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386 { |
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387 int a_len = a.length (); |
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388 return ComplexRowVector (subtract (s, a.data (), a_len), a_len); |
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389 } |
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390 |
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391 ComplexRowVector |
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392 operator * (double s, const ComplexRowVector& a) |
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393 { |
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394 int a_len = a.length (); |
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395 return ComplexRowVector (multiply (a.data (), a_len, s), a_len); |
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396 } |
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397 |
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398 ComplexRowVector |
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399 operator / (double s, const ComplexRowVector& a) |
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400 { |
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401 int a_len = a.length (); |
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402 return ComplexRowVector (divide (s, a.data (), a_len), a_len); |
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403 } |
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404 |
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1205
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405 ComplexRowVector |
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406 operator + (const Complex& s, const RowVector& a) |
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458
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407 { |
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1485
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408 int a_len = a.length (); |
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409 return ComplexRowVector (add (a.data (), a_len, s), a_len); |
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458
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410 } |
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411 |
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1205
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412 ComplexRowVector |
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413 operator - (const Complex& s, const RowVector& a) |
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458
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414 { |
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1485
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415 int a_len = a.length (); |
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416 return ComplexRowVector (subtract (s, a.data (), a_len), a_len); |
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1205
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417 } |
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458
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418 |
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1205
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419 ComplexRowVector |
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420 operator * (const Complex& s, const RowVector& a) |
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421 { |
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1485
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422 int a_len = a.length (); |
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423 return ComplexRowVector (multiply (a.data (), a_len, s), a_len); |
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1205
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424 } |
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458
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425 |
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1205
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426 ComplexRowVector |
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427 operator / (const Complex& s, const RowVector& a) |
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428 { |
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1485
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429 int a_len = a.length (); |
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430 return ComplexRowVector (divide (s, a.data (), a_len), a_len); |
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458
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431 } |
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432 |
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433 // row vector by matrix -> row vector |
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434 |
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435 ComplexRowVector |
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436 operator * (const ComplexRowVector& v, const ComplexMatrix& a) |
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437 { |
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1947
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438 ComplexRowVector retval; |
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439 |
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458
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440 int len = v.length (); |
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1947
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441 |
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2386
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442 int a_nr = a.rows (); |
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443 int a_nc = a.cols (); |
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444 |
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445 if (a_nr != len) |
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446 gripe_nonconformant ("operator *", 1, len, a_nr, a_nc); |
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1947
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447 else |
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458
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448 { |
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1947
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449 int a_nr = a.rows (); |
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450 int a_nc = a.cols (); |
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451 |
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452 if (len == 0) |
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453 retval.resize (a_nc, 0.0); |
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454 else |
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455 { |
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456 // Transpose A to form A'*x == (x'*A)' |
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457 |
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458 int ld = a_nr; |
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459 |
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460 retval.resize (a_nc); |
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461 Complex *y = retval.fortran_vec (); |
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462 |
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463 F77_XFCN (zgemv, ZGEMV, ("T", a_nr, a_nc, 1.0, a.data (), |
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464 ld, v.data (), 1, 0.0, y, 1, 1L)); |
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465 |
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466 if (f77_exception_encountered) |
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467 (*current_liboctave_error_handler) |
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468 ("unrecoverable error in zgemv"); |
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469 } |
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458
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470 } |
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471 |
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1947
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472 return retval; |
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458
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473 } |
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474 |
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1205
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475 ComplexRowVector |
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476 operator * (const RowVector& v, const ComplexMatrix& a) |
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477 { |
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478 ComplexRowVector tmp (v); |
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479 return tmp * a; |
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480 } |
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481 |
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458
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482 // row vector by row vector -> row vector operations |
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483 |
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484 ComplexRowVector |
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485 operator + (const ComplexRowVector& v, const RowVector& a) |
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486 { |
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487 int len = v.length (); |
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2386
|
488 |
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489 int a_len = a.length (); |
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490 |
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|
491 if (len != a_len) |
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458
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492 { |
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2386
|
493 gripe_nonconformant ("operator +", len, a_len); |
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458
|
494 return ComplexRowVector (); |
|
|
495 } |
|
|
496 |
|
|
497 if (len == 0) |
|
|
498 return ComplexRowVector (0); |
|
|
499 |
|
|
500 return ComplexRowVector (add (v.data (), a.data (), len), len); |
|
|
501 } |
|
|
502 |
|
|
503 ComplexRowVector |
|
|
504 operator - (const ComplexRowVector& v, const RowVector& a) |
|
|
505 { |
|
|
506 int len = v.length (); |
|
2386
|
507 |
|
|
508 int a_len = a.length (); |
|
|
509 |
|
|
510 if (len != a_len) |
|
458
|
511 { |
|
2386
|
512 gripe_nonconformant ("operator -", len, a_len); |
|
458
|
513 return ComplexRowVector (); |
|
|
514 } |
|
|
515 |
|
|
516 if (len == 0) |
|
|
517 return ComplexRowVector (0); |
|
|
518 |
|
|
519 return ComplexRowVector (subtract (v.data (), a.data (), len), len); |
|
|
520 } |
|
|
521 |
|
|
522 ComplexRowVector |
|
1205
|
523 operator + (const RowVector& v, const ComplexRowVector& a) |
|
|
524 { |
|
|
525 int len = v.length (); |
|
2386
|
526 |
|
|
527 int a_len = a.length (); |
|
|
528 |
|
|
529 if (len != a_len) |
|
1205
|
530 { |
|
2386
|
531 gripe_nonconformant ("operator +", len, a_len); |
|
1205
|
532 return ComplexRowVector (); |
|
|
533 } |
|
|
534 |
|
|
535 if (len == 0) |
|
|
536 return ComplexRowVector (0); |
|
|
537 |
|
|
538 return ComplexRowVector (add (v.data (), a.data (), len), len); |
|
|
539 } |
|
|
540 |
|
|
541 ComplexRowVector |
|
|
542 operator - (const RowVector& v, const ComplexRowVector& a) |
|
|
543 { |
|
|
544 int len = v.length (); |
|
2386
|
545 |
|
|
546 int a_len = a.length (); |
|
|
547 |
|
|
548 if (len != a_len) |
|
1205
|
549 { |
|
2386
|
550 gripe_nonconformant ("operator -", len, a_len); |
|
1205
|
551 return ComplexRowVector (); |
|
|
552 } |
|
|
553 |
|
|
554 if (len == 0) |
|
|
555 return ComplexRowVector (0); |
|
|
556 |
|
|
557 return ComplexRowVector (subtract (v.data (), a.data (), len), len); |
|
|
558 } |
|
|
559 |
|
|
560 ComplexRowVector |
|
458
|
561 product (const ComplexRowVector& v, const RowVector& a) |
|
|
562 { |
|
|
563 int len = v.length (); |
|
2386
|
564 |
|
|
565 int a_len = a.length (); |
|
|
566 |
|
|
567 if (len != a_len) |
|
458
|
568 { |
|
2386
|
569 gripe_nonconformant ("product", len, a_len); |
|
458
|
570 return ComplexRowVector (); |
|
|
571 } |
|
|
572 |
|
|
573 if (len == 0) |
|
|
574 return ComplexRowVector (0); |
|
|
575 |
|
|
576 return ComplexRowVector (multiply (v.data (), a.data (), len), len); |
|
|
577 } |
|
|
578 |
|
|
579 ComplexRowVector |
|
|
580 quotient (const ComplexRowVector& v, const RowVector& a) |
|
|
581 { |
|
|
582 int len = v.length (); |
|
2386
|
583 |
|
|
584 int a_len = a.length (); |
|
|
585 |
|
|
586 if (len != a_len) |
|
458
|
587 { |
|
2386
|
588 gripe_nonconformant ("quotient", len, a_len); |
|
458
|
589 return ComplexRowVector (); |
|
|
590 } |
|
|
591 |
|
|
592 if (len == 0) |
|
|
593 return ComplexRowVector (0); |
|
|
594 |
|
|
595 return ComplexRowVector (divide (v.data (), a.data (), len), len); |
|
|
596 } |
|
|
597 |
|
1205
|
598 ComplexRowVector |
|
|
599 product (const RowVector& v, const ComplexRowVector& a) |
|
|
600 { |
|
|
601 int len = v.length (); |
|
2386
|
602 |
|
|
603 int a_len = a.length (); |
|
|
604 |
|
|
605 if (len != a_len) |
|
1205
|
606 { |
|
2386
|
607 gripe_nonconformant ("product", len, a_len); |
|
1205
|
608 return ComplexRowVector (); |
|
|
609 } |
|
|
610 |
|
|
611 if (len == 0) |
|
|
612 return ComplexRowVector (0); |
|
|
613 |
|
|
614 return ComplexRowVector (multiply (v.data (), a.data (), len), len); |
|
|
615 } |
|
|
616 |
|
|
617 ComplexRowVector |
|
|
618 quotient (const RowVector& v, const ComplexRowVector& a) |
|
|
619 { |
|
|
620 int len = v.length (); |
|
2386
|
621 |
|
|
622 int a_len = a.length (); |
|
|
623 |
|
|
624 if (len != a_len) |
|
1205
|
625 { |
|
2386
|
626 gripe_nonconformant ("quotient", len, a_len); |
|
1205
|
627 return ComplexRowVector (); |
|
|
628 } |
|
|
629 |
|
|
630 if (len == 0) |
|
|
631 return ComplexRowVector (0); |
|
|
632 |
|
|
633 return ComplexRowVector (divide (v.data (), a.data (), len), len); |
|
|
634 } |
|
|
635 |
|
458
|
636 // other operations |
|
|
637 |
|
|
638 ComplexRowVector |
|
|
639 map (c_c_Mapper f, const ComplexRowVector& a) |
|
|
640 { |
|
|
641 ComplexRowVector b (a); |
|
|
642 b.map (f); |
|
|
643 return b; |
|
|
644 } |
|
|
645 |
|
|
646 void |
|
|
647 ComplexRowVector::map (c_c_Mapper f) |
|
|
648 { |
|
|
649 for (int i = 0; i < length (); i++) |
|
|
650 elem (i) = f (elem (i)); |
|
|
651 } |
|
|
652 |
|
|
653 Complex |
|
|
654 ComplexRowVector::min (void) const |
|
|
655 { |
|
|
656 int len = length (); |
|
|
657 if (len == 0) |
|
|
658 return Complex (0.0); |
|
|
659 |
|
|
660 Complex res = elem (0); |
|
|
661 double absres = abs (res); |
|
|
662 |
|
|
663 for (int i = 1; i < len; i++) |
|
|
664 if (abs (elem (i)) < absres) |
|
|
665 { |
|
|
666 res = elem (i); |
|
|
667 absres = abs (res); |
|
|
668 } |
|
|
669 |
|
|
670 return res; |
|
|
671 } |
|
|
672 |
|
|
673 Complex |
|
|
674 ComplexRowVector::max (void) const |
|
|
675 { |
|
|
676 int len = length (); |
|
|
677 if (len == 0) |
|
|
678 return Complex (0.0); |
|
|
679 |
|
|
680 Complex res = elem (0); |
|
|
681 double absres = abs (res); |
|
|
682 |
|
|
683 for (int i = 1; i < len; i++) |
|
|
684 if (abs (elem (i)) > absres) |
|
|
685 { |
|
|
686 res = elem (i); |
|
|
687 absres = abs (res); |
|
|
688 } |
|
|
689 |
|
|
690 return res; |
|
|
691 } |
|
|
692 |
|
|
693 // i/o |
|
|
694 |
|
|
695 ostream& |
|
|
696 operator << (ostream& os, const ComplexRowVector& a) |
|
|
697 { |
|
|
698 // int field_width = os.precision () + 7; |
|
|
699 for (int i = 0; i < a.length (); i++) |
|
|
700 os << " " /* setw (field_width) */ << a.elem (i); |
|
|
701 return os; |
|
|
702 } |
|
|
703 |
|
|
704 istream& |
|
|
705 operator >> (istream& is, ComplexRowVector& a) |
|
|
706 { |
|
|
707 int len = a.length(); |
|
|
708 |
|
|
709 if (len < 1) |
|
|
710 is.clear (ios::badbit); |
|
|
711 else |
|
|
712 { |
|
|
713 Complex tmp; |
|
|
714 for (int i = 0; i < len; i++) |
|
|
715 { |
|
|
716 is >> tmp; |
|
|
717 if (is) |
|
|
718 a.elem (i) = tmp; |
|
|
719 else |
|
|
720 break; |
|
|
721 } |
|
|
722 } |
|
532
|
723 return is; |
|
458
|
724 } |
|
|
725 |
|
1205
|
726 // row vector by column vector -> scalar |
|
|
727 |
|
|
728 // row vector by column vector -> scalar |
|
|
729 |
|
|
730 Complex |
|
|
731 operator * (const ComplexRowVector& v, const ColumnVector& a) |
|
|
732 { |
|
|
733 ComplexColumnVector tmp (a); |
|
|
734 return v * tmp; |
|
|
735 } |
|
|
736 |
|
|
737 Complex |
|
|
738 operator * (const ComplexRowVector& v, const ComplexColumnVector& a) |
|
|
739 { |
|
|
740 int len = v.length (); |
|
2386
|
741 |
|
|
742 int a_len = a.length (); |
|
|
743 |
|
|
744 if (len != a_len) |
|
1205
|
745 { |
|
2386
|
746 gripe_nonconformant ("operator *", len, a_len); |
|
1205
|
747 return 0.0; |
|
|
748 } |
|
|
749 |
|
|
750 Complex retval (0.0, 0.0); |
|
|
751 |
|
|
752 for (int i = 0; i < len; i++) |
|
|
753 retval += v.elem (i) * a.elem (i); |
|
|
754 |
|
|
755 return retval; |
|
|
756 } |
|
|
757 |
|
|
758 // other operations |
|
|
759 |
|
|
760 ComplexRowVector |
|
|
761 linspace (const Complex& x1, const Complex& x2, int n) |
|
|
762 { |
|
|
763 ComplexRowVector retval; |
|
|
764 |
|
|
765 if (n > 0) |
|
|
766 { |
|
|
767 retval.resize (n); |
|
|
768 Complex delta = (x2 - x1) / (n - 1); |
|
|
769 retval.elem (0) = x1; |
|
|
770 for (int i = 1; i < n-1; i++) |
|
|
771 retval.elem (i) = x1 + i * delta; |
|
|
772 retval.elem (n-1) = x2; |
|
|
773 } |
|
|
774 |
|
|
775 return retval; |
|
|
776 } |
|
|
777 |
|
458
|
778 /* |
|
|
779 ;;; Local Variables: *** |
|
|
780 ;;; mode: C++ *** |
|
|
781 ;;; End: *** |
|
|
782 */ |
