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annotate liboctave/fRowVector.cc @ 11542:695141f1c05c ss-3-3-55

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snapshot 3.3.55
author John W. Eaton <jwe@octave.org>
date Sat, 15 Jan 2011 04:53:04 -0500
parents fd0a3ac60b0e
children 72c96de7a403
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1 // RowVector manipulations.
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2 /*
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3
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4 Copyright (C) 1994-2011 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 3 of the License, or (at your
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11 option) any 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, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <iostream>
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29
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30 #include "Array-util.h"
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31 #include "f77-fcn.h"
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32 #include "functor.h"
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33 #include "lo-error.h"
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34 #include "mx-base.h"
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35 #include "mx-inlines.cc"
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36 #include "oct-cmplx.h"
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37
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38 // Fortran functions we call.
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39
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40 extern "C"
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41 {
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42 F77_RET_T
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43 F77_FUNC (sgemv, SGEMV) (F77_CONST_CHAR_ARG_DECL,
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44 const octave_idx_type&, const octave_idx_type&,
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45 const float&, const float*,
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46 const octave_idx_type&, const float*,
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47 const octave_idx_type&, const float&,
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48 float*, const octave_idx_type&
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49 F77_CHAR_ARG_LEN_DECL);
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50 F77_RET_T
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51 F77_FUNC (xsdot, XSDOT) (const octave_idx_type&, const float*,
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52 const octave_idx_type&, const float*,
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53 const octave_idx_type&, float&);
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54 }
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55
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56 // Row Vector class.
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57
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58 bool
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59 FloatRowVector::operator == (const FloatRowVector& a) const
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60 {
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61 octave_idx_type len = length ();
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62 if (len != a.length ())
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63 return 0;
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64 return mx_inline_equal (len, data (), a.data ());
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65 }
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66
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67 bool
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68 FloatRowVector::operator != (const FloatRowVector& a) const
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69 {
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70 return !(*this == a);
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71 }
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72
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73 FloatRowVector&
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74 FloatRowVector::insert (const FloatRowVector& a, octave_idx_type c)
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75 {
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76 octave_idx_type a_len = a.length ();
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77
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78 if (c < 0 || c + a_len > length ())
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79 {
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80 (*current_liboctave_error_handler) ("range error for insert");
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81 return *this;
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82 }
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83
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84 if (a_len > 0)
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85 {
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86 make_unique ();
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87
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88 for (octave_idx_type i = 0; i < a_len; i++)
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89 xelem (c+i) = a.elem (i);
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90 }
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91
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92 return *this;
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93 }
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94
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95 FloatRowVector&
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96 FloatRowVector::fill (float val)
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97 {
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98 octave_idx_type len = length ();
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99
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100 if (len > 0)
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101 {
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102 make_unique ();
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103
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104 for (octave_idx_type i = 0; i < len; i++)
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105 xelem (i) = val;
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106 }
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107
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108 return *this;
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109 }
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110
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111 FloatRowVector&
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112 FloatRowVector::fill (float val, octave_idx_type c1, octave_idx_type c2)
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113 {
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114 octave_idx_type len = length ();
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115
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116 if (c1 < 0 || c2 < 0 || c1 >= len || c2 >= len)
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117 {
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118 (*current_liboctave_error_handler) ("range error for fill");
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119 return *this;
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120 }
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121
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122 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; }
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123
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124 if (c2 >= c1)
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125 {
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126 make_unique ();
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127
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128 for (octave_idx_type i = c1; i <= c2; i++)
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129 xelem (i) = val;
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130 }
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131
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132 return *this;
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133 }
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134
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135 FloatRowVector
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136 FloatRowVector::append (const FloatRowVector& a) const
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137 {
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138 octave_idx_type len = length ();
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139 octave_idx_type nc_insert = len;
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140 FloatRowVector retval (len + a.length ());
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141 retval.insert (*this, 0);
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142 retval.insert (a, nc_insert);
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143 return retval;
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144 }
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145
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146 FloatColumnVector
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147 FloatRowVector::transpose (void) const
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148 {
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149 return MArray<float>::transpose();
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150 }
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151
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152 FloatRowVector
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153 real (const FloatComplexRowVector& a)
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154 {
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155 return do_mx_unary_op<float, FloatComplex> (a, mx_inline_real);
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156 }
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157
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158 FloatRowVector
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159 imag (const FloatComplexRowVector& a)
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160 {
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161 return do_mx_unary_op<float, FloatComplex> (a, mx_inline_imag);
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162 }
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163
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164 FloatRowVector
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165 FloatRowVector::extract (octave_idx_type c1, octave_idx_type c2) const
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166 {
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167 if (c1 > c2) { octave_idx_type tmp = c1; c1 = c2; c2 = tmp; }
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168
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169 octave_idx_type new_c = c2 - c1 + 1;
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170
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171 FloatRowVector result (new_c);
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172
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173 for (octave_idx_type i = 0; i < new_c; i++)
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174 result.xelem (i) = elem (c1+i);
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175
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176 return result;
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177 }
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178
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179 FloatRowVector
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180 FloatRowVector::extract_n (octave_idx_type r1, octave_idx_type n) const
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181 {
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182 FloatRowVector result (n);
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183
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184 for (octave_idx_type i = 0; i < n; i++)
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185 result.xelem (i) = elem (r1+i);
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186
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187 return result;
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188 }
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189
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190 // row vector by matrix -> row vector
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191
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192 FloatRowVector
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193 operator * (const FloatRowVector& v, const FloatMatrix& a)
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194 {
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195 FloatRowVector retval;
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196
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197 octave_idx_type len = v.length ();
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198
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199 octave_idx_type a_nr = a.rows ();
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200 octave_idx_type a_nc = a.cols ();
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201
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202 if (a_nr != len)
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203 gripe_nonconformant ("operator *", 1, len, a_nr, a_nc);
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204 else
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205 {
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206 if (len == 0)
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207 retval.resize (a_nc, 0.0);
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208 else
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209 {
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210 // Transpose A to form A'*x == (x'*A)'
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211
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212 octave_idx_type ld = a_nr;
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213
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214 retval.resize (a_nc);
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215 float *y = retval.fortran_vec ();
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216
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217 F77_XFCN (sgemv, SGEMV, (F77_CONST_CHAR_ARG2 ("T", 1),
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218 a_nr, a_nc, 1.0, a.data (),
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219 ld, v.data (), 1, 0.0, y, 1
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220 F77_CHAR_ARG_LEN (1)));
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221 }
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222 }
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223
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224 return retval;
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225 }
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226
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227 // other operations
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228
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229 float
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230 FloatRowVector::min (void) const
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231 {
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232 octave_idx_type len = length ();
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233 if (len == 0)
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234 return 0;
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235
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236 float res = elem (0);
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237
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238 for (octave_idx_type i = 1; i < len; i++)
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239 if (elem (i) < res)
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240 res = elem (i);
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241
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242 return res;
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243 }
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244
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245 float
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246 FloatRowVector::max (void) const
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247 {
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248 octave_idx_type len = length ();
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249 if (len == 0)
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250 return 0;
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251
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252 float res = elem (0);
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253
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254 for (octave_idx_type i = 1; i < len; i++)
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255 if (elem (i) > res)
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256 res = elem (i);
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257
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258 return res;
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259 }
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260
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261 std::ostream&
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262 operator << (std::ostream& os, const FloatRowVector& a)
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263 {
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264 // int field_width = os.precision () + 7;
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265
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266 for (octave_idx_type i = 0; i < a.length (); i++)
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267 os << " " /* setw (field_width) */ << a.elem (i);
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268 return os;
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269 }
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270
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271 std::istream&
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272 operator >> (std::istream& is, FloatRowVector& a)
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273 {
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274 octave_idx_type len = a.length();
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275
8999
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276 if (len > 0)
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277 {
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278 float tmp;
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279 for (octave_idx_type i = 0; i < len; i++)
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280 {
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281 is >> tmp;
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282 if (is)
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283 a.elem (i) = tmp;
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284 else
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285 break;
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286 }
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287 }
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288 return is;
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289 }
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290
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291 // other operations
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292
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293 FloatRowVector
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294 linspace (float x1, float x2, octave_idx_type n)
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295 {
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296 if (n < 1) n = 1;
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297
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298 NoAlias<FloatRowVector> retval (n);
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299
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300 float delta = (x2 - x1) / (n - 1);
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301 retval(0) = x1;
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302 for (octave_idx_type i = 1; i < n-1; i++)
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303 retval(i) = x1 + i*delta;
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304 retval(n-1) = x2;
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305
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306 return retval;
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307 }
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308
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309 // row vector by column vector -> scalar
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310
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311 float
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312 operator * (const FloatRowVector& v, const FloatColumnVector& a)
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313 {
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314 float retval = 0.0;
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315
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316 octave_idx_type len = v.length ();
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317
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318 octave_idx_type a_len = a.length ();
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319
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320 if (len != a_len)
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321 gripe_nonconformant ("operator *", len, a_len);
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322 else if (len != 0)
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323 F77_FUNC (xsdot, XSDOT) (len, v.data (), 1, a.data (), 1, retval);
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324
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325 return retval;
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326 }
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327
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328 FloatComplex
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329 operator * (const FloatRowVector& v, const FloatComplexColumnVector& a)
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330 {
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331 FloatComplexRowVector tmp (v);
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332 return tmp * a;
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333 }