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annotate liboctave/fRowVector.cc @ 8721:e9cb742df9eb

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imported patch sort3.diff
author Jaroslav Hajek <highegg@gmail.com>
date Wed, 11 Feb 2009 15:25:53 +0100
parents 82be108cc558
children eb63fbe60fab
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1 // RowVector manipulations.
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2 /*
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3
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4 Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2002, 2003,
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5 2004, 2005, 2006, 2007 John W. Eaton
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6
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7 This file is part of Octave.
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8
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9 Octave is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 3 of the License, or (at your
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12 option) any later version.
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13
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14 Octave is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with Octave; see the file COPYING. If not, see
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21 <http://www.gnu.org/licenses/>.
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22
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23 */
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24
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25 #ifdef HAVE_CONFIG_H
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26 #include <config.h>
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27 #endif
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28
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29 #include <iostream>
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30
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31 #include "Array-util.h"
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32 #include "f77-fcn.h"
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33 #include "functor.h"
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34 #include "lo-error.h"
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35 #include "mx-base.h"
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36 #include "mx-inlines.cc"
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37 #include "oct-cmplx.h"
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38
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39 // Fortran functions we call.
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40
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41 extern "C"
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42 {
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43 F77_RET_T
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44 F77_FUNC (sgemv, SGEMV) (F77_CONST_CHAR_ARG_DECL,
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45 const octave_idx_type&, const octave_idx_type&, const float&,
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46 const float*, const octave_idx_type&, const float*,
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47 const octave_idx_type&, const float&, float*, const octave_idx_type&
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48 F77_CHAR_ARG_LEN_DECL);
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49 F77_RET_T
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50 F77_FUNC (xsdot, XSDOT) (const octave_idx_type&, const float*, const octave_idx_type&,
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51 const float*, const octave_idx_type&, float&);
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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 FloatRowVector::operator == (const FloatRowVector& a) const
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58 {
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59 octave_idx_type len = length ();
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60 if (len != a.length ())
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61 return 0;
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62 return mx_inline_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 FloatRowVector::operator != (const FloatRowVector& 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 FloatRowVector&
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72 FloatRowVector::insert (const FloatRowVector& a, octave_idx_type c)
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73 {
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74 octave_idx_type a_len = a.length ();
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75
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76 if (c < 0 || c + a_len > 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 if (a_len > 0)
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83 {
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84 make_unique ();
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85
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86 for (octave_idx_type i = 0; i < a_len; i++)
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87 xelem (c+i) = a.elem (i);
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88 }
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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 FloatRowVector&
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94 FloatRowVector::fill (float val)
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95 {
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96 octave_idx_type len = length ();
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97
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98 if (len > 0)
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99 {
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100 make_unique ();
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101
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102 for (octave_idx_type i = 0; i < len; i++)
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103 xelem (i) = val;
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104 }
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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 FloatRowVector&
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110 FloatRowVector::fill (float val, octave_idx_type c1, octave_idx_type c2)
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111 {
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112 octave_idx_type len = length ();
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113
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114 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len)
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115 {
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116 (*current_liboctave_error_handler) ("range error for fill");
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117 return *this;
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118 }
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119
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120 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; }
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121
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122 if (c2 >= c1)
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123 {
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124 make_unique ();
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125
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126 for (octave_idx_type i = c1; i <= c2; i++)
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127 xelem (i) = val;
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128 }
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129
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130 return *this;
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131 }
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132
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133 FloatRowVector
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134 FloatRowVector::append (const FloatRowVector& a) const
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135 {
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136 octave_idx_type len = length ();
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137 octave_idx_type nc_insert = len;
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138 FloatRowVector retval (len + a.length ());
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139 retval.insert (*this, 0);
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140 retval.insert (a, nc_insert);
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141 return retval;
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142 }
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143
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144 FloatColumnVector
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145 FloatRowVector::transpose (void) const
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146 {
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147 return MArray<float>::transpose();
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148 }
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149
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150 FloatRowVector
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151 real (const FloatComplexRowVector& a)
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152 {
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153 octave_idx_type a_len = a.length ();
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154 FloatRowVector retval;
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155 if (a_len > 0)
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156 retval = FloatRowVector (mx_inline_real_dup (a.data (), a_len), a_len);
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157 return retval;
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158 }
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159
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160 FloatRowVector
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161 imag (const FloatComplexRowVector& a)
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162 {
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163 octave_idx_type a_len = a.length ();
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164 FloatRowVector retval;
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165 if (a_len > 0)
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166 retval = FloatRowVector (mx_inline_imag_dup (a.data (), a_len), a_len);
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167 return retval;
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168 }
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169
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170 FloatRowVector
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171 FloatRowVector::extract (octave_idx_type c1, octave_idx_type c2) const
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172 {
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173 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; }
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174
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175 octave_idx_type new_c = c2 - c1 + 1;
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176
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177 FloatRowVector result (new_c);
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178
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179 for (octave_idx_type i = 0; i < new_c; i++)
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180 result.xelem (i) = elem (c1+i);
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181
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182 return result;
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183 }
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184
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185 FloatRowVector
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186 FloatRowVector::extract_n (octave_idx_type r1, octave_idx_type n) const
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187 {
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188 FloatRowVector result (n);
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189
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190 for (octave_idx_type i = 0; i < n; i++)
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191 result.xelem (i) = elem (r1+i);
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192
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193 return result;
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194 }
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195
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196 // row vector by matrix -> row vector
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197
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198 FloatRowVector
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199 operator * (const FloatRowVector& v, const FloatMatrix& a)
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200 {
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201 FloatRowVector retval;
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202
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203 octave_idx_type len = v.length ();
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204
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205 octave_idx_type a_nr = a.rows ();
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206 octave_idx_type a_nc = a.cols ();
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207
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208 if (a_nr != len)
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209 gripe_nonconformant ("operator *", 1, len, a_nr, a_nc);
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210 else
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211 {
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212 if (len == 0)
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213 retval.resize (a_nc, 0.0);
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214 else
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215 {
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216 // Transpose A to form A'*x == (x'*A)'
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217
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218 octave_idx_type ld = a_nr;
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219
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220 retval.resize (a_nc);
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221 float *y = retval.fortran_vec ();
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222
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223 F77_XFCN (sgemv, SGEMV, (F77_CONST_CHAR_ARG2 ("T", 1),
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224 a_nr, a_nc, 1.0, a.data (),
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225 ld, v.data (), 1, 0.0, y, 1
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226 F77_CHAR_ARG_LEN (1)));
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227 }
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228 }
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229
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230 return retval;
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231 }
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232
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233 // other operations
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234
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235 FloatRowVector
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236 FloatRowVector::map (dmapper fcn) const
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237 {
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238 return MArray<float>::map<float> (func_ptr (fcn));
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239 }
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240
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241 FloatComplexRowVector
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242 FloatRowVector::map (cmapper fcn) const
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243 {
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244 return MArray<float>::map<FloatComplex> (func_ptr (fcn));
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245 }
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246
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247 float
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248 FloatRowVector::min (void) const
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249 {
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250 octave_idx_type len = length ();
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251 if (len == 0)
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252 return 0;
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253
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254 float res = elem (0);
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255
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256 for (octave_idx_type i = 1; i < len; i++)
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257 if (elem (i) < res)
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258 res = elem (i);
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259
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260 return res;
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261 }
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262
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263 float
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264 FloatRowVector::max (void) const
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parents:
diff changeset
265 {
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266 octave_idx_type len = length ();
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267 if (len == 0)
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268 return 0;
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diff changeset
269
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270 float res = elem (0);
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diff changeset
271
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272 for (octave_idx_type i = 1; i < len; i++)
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273 if (elem (i) > res)
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274 res = elem (i);
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275
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276 return res;
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277 }
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diff changeset
278
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diff changeset
279 std::ostream&
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diff changeset
280 operator << (std::ostream& os, const FloatRowVector& a)
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diff changeset
281 {
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282 // int field_width = os.precision () + 7;
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283
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284 for (octave_idx_type i = 0; i < a.length (); i++)
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285 os << " " /* setw (field_width) */ << a.elem (i);
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286 return os;
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diff changeset
287 }
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diff changeset
288
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diff changeset
289 std::istream&
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diff changeset
290 operator >> (std::istream& is, FloatRowVector& a)
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parents:
diff changeset
291 {
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diff changeset
292 octave_idx_type len = a.length();
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diff changeset
293
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diff changeset
294 if (len < 1)
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295 is.clear (std::ios::badbit);
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diff changeset
296 else
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diff changeset
297 {
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diff changeset
298 float tmp;
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diff changeset
299 for (octave_idx_type i = 0; i < len; i++)
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diff changeset
300 {
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301 is >> tmp;
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diff changeset
302 if (is)
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diff changeset
303 a.elem (i) = tmp;
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parents:
diff changeset
304 else
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parents:
diff changeset
305 break;
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parents:
diff changeset
306 }
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diff changeset
307 }
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parents:
diff changeset
308 return is;
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parents:
diff changeset
309 }
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310
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diff changeset
311 // other operations
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diff changeset
312
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diff changeset
313 FloatRowVector
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parents:
diff changeset
314 linspace (float x1, float x2, octave_idx_type n)
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diff changeset
315 {
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diff changeset
316 FloatRowVector retval;
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diff changeset
317
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diff changeset
318 if (n > 1)
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diff changeset
319 {
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diff changeset
320 retval.resize (n);
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diff changeset
321 float delta = (x2 - x1) / (n - 1);
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diff changeset
322 retval.elem (0) = x1;
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diff changeset
323 for (octave_idx_type i = 1; i < n-1; i++)
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diff changeset
324 retval.elem (i) = x1 + i * delta;
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diff changeset
325 retval.elem (n-1) = x2;
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diff changeset
326 }
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parents:
diff changeset
327 else
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parents:
diff changeset
328 {
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diff changeset
329 retval.resize (1);
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diff changeset
330 retval.elem (0) = x2;
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diff changeset
331 }
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diff changeset
332
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diff changeset
333 return retval;
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parents:
diff changeset
334 }
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diff changeset
335
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parents:
diff changeset
336 // row vector by column vector -> scalar
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parents:
diff changeset
337
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diff changeset
338 float
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parents:
diff changeset
339 operator * (const FloatRowVector& v, const FloatColumnVector& a)
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parents:
diff changeset
340 {
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diff changeset
341 float retval = 0.0;
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parents:
diff changeset
342
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diff changeset
343 octave_idx_type len = v.length ();
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parents:
diff changeset
344
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diff changeset
345 octave_idx_type a_len = a.length ();
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parents:
diff changeset
346
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diff changeset
347 if (len != a_len)
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parents:
diff changeset
348 gripe_nonconformant ("operator *", len, a_len);
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349 else if (len != 0)
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350 F77_FUNC (xsdot, XSDOT) (len, v.data (), 1, a.data (), 1, retval);
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351
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352 return retval;
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353 }
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354
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355 FloatComplex
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356 operator * (const FloatRowVector& v, const FloatComplexColumnVector& a)
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357 {
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358 FloatComplexRowVector tmp (v);
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359 return tmp * a;
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360 }
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361
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362 /*
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363 ;;; Local Variables: ***
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364 ;;; mode: C++ ***
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365 ;;; End: ***
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366 */