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annotate liboctave/fDiagMatrix.cc @ 7924:4976f66d469b

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miscellaneous cleanup
author John W. Eaton <jwe@octave.org>
date Fri, 11 Jul 2008 17:59:28 -0400
parents 82be108cc558
children 8b1a2555c4e2
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1 // FloatDiagMatrix manipulations.
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2 /*
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3
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4 Copyright (C) 1994, 1995, 1996, 1997, 2000, 2001, 2002, 2003, 2004,
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5 2005, 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 "lo-error.h"
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33 #include "mx-base.h"
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34 #include "mx-inlines.cc"
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35 #include "oct-cmplx.h"
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36
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37 // Diagonal Matrix class.
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38
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39 bool
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40 FloatDiagMatrix::operator == (const FloatDiagMatrix& a) const
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41 {
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42 if (rows () != a.rows () || cols () != a.cols ())
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43 return 0;
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44
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45 return mx_inline_equal (data (), a.data (), length ());
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46 }
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47
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48 bool
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49 FloatDiagMatrix::operator != (const FloatDiagMatrix& a) const
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50 {
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51 return !(*this == a);
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52 }
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53
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54 FloatDiagMatrix&
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55 FloatDiagMatrix::fill (float val)
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56 {
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57 for (octave_idx_type i = 0; i < length (); i++)
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58 elem (i, i) = val;
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59 return *this;
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60 }
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61
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62 FloatDiagMatrix&
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63 FloatDiagMatrix::fill (float val, octave_idx_type beg, octave_idx_type end)
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64 {
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65 if (beg < 0 || end >= length () || end < beg)
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66 {
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67 (*current_liboctave_error_handler) ("range error for fill");
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68 return *this;
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69 }
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70
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71 for (octave_idx_type i = beg; i <= end; i++)
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72 elem (i, i) = val;
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73
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74 return *this;
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75 }
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76
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77 FloatDiagMatrix&
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78 FloatDiagMatrix::fill (const FloatColumnVector& a)
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79 {
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80 octave_idx_type len = length ();
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81 if (a.length () != len)
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82 {
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83 (*current_liboctave_error_handler) ("range error for fill");
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84 return *this;
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85 }
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86
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87 for (octave_idx_type i = 0; i < len; i++)
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88 elem (i, 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 FloatDiagMatrix&
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94 FloatDiagMatrix::fill (const FloatRowVector& a)
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95 {
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96 octave_idx_type len = length ();
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97 if (a.length () != len)
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98 {
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99 (*current_liboctave_error_handler) ("range error for fill");
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100 return *this;
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101 }
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102
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103 for (octave_idx_type i = 0; i < len; i++)
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104 elem (i, 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 FloatDiagMatrix&
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110 FloatDiagMatrix::fill (const FloatColumnVector& a, octave_idx_type beg)
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111 {
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112 octave_idx_type a_len = a.length ();
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113 if (beg < 0 || beg + a_len >= length ())
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114 {
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115 (*current_liboctave_error_handler) ("range error for fill");
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116 return *this;
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117 }
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118
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119 for (octave_idx_type i = 0; i < a_len; i++)
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120 elem (i+beg, i+beg) = a.elem (i);
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121
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122 return *this;
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123 }
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124
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125 FloatDiagMatrix&
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126 FloatDiagMatrix::fill (const FloatRowVector& a, octave_idx_type beg)
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127 {
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128 octave_idx_type a_len = a.length ();
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129 if (beg < 0 || beg + a_len >= length ())
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130 {
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131 (*current_liboctave_error_handler) ("range error for fill");
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132 return *this;
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133 }
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134
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135 for (octave_idx_type i = 0; i < a_len; i++)
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136 elem (i+beg, i+beg) = a.elem (i);
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137
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138 return *this;
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139 }
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140
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141 FloatDiagMatrix
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142 real (const FloatComplexDiagMatrix& a)
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143 {
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144 FloatDiagMatrix retval;
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145 octave_idx_type a_len = a.length ();
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146 if (a_len > 0)
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147 retval = FloatDiagMatrix (mx_inline_real_dup (a.data (), a_len), a.rows (),
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148 a.cols ());
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149 return retval;
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150 }
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151
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152 FloatDiagMatrix
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153 imag (const FloatComplexDiagMatrix& a)
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154 {
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155 FloatDiagMatrix retval;
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156 octave_idx_type a_len = a.length ();
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157 if (a_len > 0)
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158 retval = FloatDiagMatrix (mx_inline_imag_dup (a.data (), a_len), a.rows (),
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159 a.cols ());
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160 return retval;
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161 }
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162
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163 FloatMatrix
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164 FloatDiagMatrix::extract (octave_idx_type r1, octave_idx_type c1, octave_idx_type r2, octave_idx_type c2) const
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165 {
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166 if (r1 > r2) { octave_idx_type tmp = r1; r1 = r2; r2 = tmp; }
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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_r = r2 - r1 + 1;
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170 octave_idx_type new_c = c2 - c1 + 1;
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171
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172 FloatMatrix result (new_r, new_c);
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173
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174 for (octave_idx_type j = 0; j < new_c; j++)
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175 for (octave_idx_type i = 0; i < new_r; i++)
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176 result.elem (i, j) = elem (r1+i, c1+j);
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177
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178 return result;
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179 }
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180
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181 // extract row or column i.
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182
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183 FloatRowVector
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184 FloatDiagMatrix::row (octave_idx_type i) const
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185 {
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186 octave_idx_type r = rows ();
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187 octave_idx_type c = cols ();
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188 if (i < 0 || i >= r)
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189 {
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190 (*current_liboctave_error_handler) ("invalid row selection");
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191 return FloatRowVector ();
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192 }
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193
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194 FloatRowVector retval (c, 0.0);
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195 if (r <= c || (r > c && i < c))
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196 retval.elem (i) = elem (i, i);
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197
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198 return retval;
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199 }
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200
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201 FloatRowVector
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202 FloatDiagMatrix::row (char *s) const
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203 {
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204 if (! s)
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205 {
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206 (*current_liboctave_error_handler) ("invalid row selection");
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207 return FloatRowVector ();
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208 }
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209
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210 char c = *s;
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211 if (c == 'f' || c == 'F')
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212 return row (static_cast<octave_idx_type>(0));
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213 else if (c == 'l' || c == 'L')
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214 return row (rows () - 1);
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215 else
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216 {
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217 (*current_liboctave_error_handler) ("invalid row selection");
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218 return FloatRowVector ();
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219 }
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220 }
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221
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222 FloatColumnVector
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223 FloatDiagMatrix::column (octave_idx_type i) const
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224 {
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225 octave_idx_type r = rows ();
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226 octave_idx_type c = cols ();
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227 if (i < 0 || i >= c)
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228 {
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229 (*current_liboctave_error_handler) ("invalid column selection");
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230 return FloatColumnVector ();
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231 }
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232
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233 FloatColumnVector retval (r, 0.0);
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234 if (r >= c || (r < c && i < r))
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235 retval.elem (i) = elem (i, i);
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236
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237 return retval;
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238 }
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239
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240 FloatColumnVector
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241 FloatDiagMatrix::column (char *s) const
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242 {
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243 if (! s)
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244 {
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245 (*current_liboctave_error_handler) ("invalid column selection");
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246 return FloatColumnVector ();
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247 }
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248
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249 char c = *s;
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250 if (c == 'f' || c == 'F')
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251 return column (static_cast<octave_idx_type>(0));
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252 else if (c == 'l' || c == 'L')
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253 return column (cols () - 1);
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254 else
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255 {
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256 (*current_liboctave_error_handler) ("invalid column selection");
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257 return FloatColumnVector ();
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258 }
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259 }
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260
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261 FloatDiagMatrix
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262 FloatDiagMatrix::inverse (void) const
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263 {
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264 int info;
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265 return inverse (info);
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266 }
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267
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268 FloatDiagMatrix
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269 FloatDiagMatrix::inverse (int &info) const
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270 {
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271 octave_idx_type r = rows ();
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272 octave_idx_type c = cols ();
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273 octave_idx_type len = length ();
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274 if (r != c)
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275 {
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276 (*current_liboctave_error_handler) ("inverse requires square matrix");
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277 return FloatDiagMatrix ();
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278 }
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279
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280 FloatDiagMatrix retval (r, c);
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281
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282 info = 0;
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283 for (octave_idx_type i = 0; i < len; i++)
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diff changeset
284 {
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285 if (elem (i, i) == 0.0)
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286 {
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287 info = -1;
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288 return *this;
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289 }
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290 else
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291 retval.elem (i, i) = 1.0 / elem (i, i);
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292 }
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293
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294 return retval;
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295 }
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296
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297 // diagonal matrix by diagonal matrix -> diagonal matrix operations
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diff changeset
298
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299 // diagonal matrix by diagonal matrix -> diagonal matrix operations
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300
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301 FloatDiagMatrix
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302 operator * (const FloatDiagMatrix& a, const FloatDiagMatrix& b)
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303 {
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304 octave_idx_type a_nr = a.rows ();
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305 octave_idx_type a_nc = a.cols ();
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diff changeset
306
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307 octave_idx_type b_nr = b.rows ();
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308 octave_idx_type b_nc = b.cols ();
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309
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310 if (a_nc != b_nr)
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diff changeset
311 {
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312 gripe_nonconformant ("operaotr *", a_nr, a_nc, b_nr, b_nc);
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313 return FloatDiagMatrix ();
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314 }
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315
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316 if (a_nr == 0 || a_nc == 0 || b_nc == 0)
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317 return FloatDiagMatrix (a_nr, a_nc, 0.0);
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diff changeset
318
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319 FloatDiagMatrix c (a_nr, b_nc);
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diff changeset
320
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321 octave_idx_type len = a_nr < b_nc ? a_nr : b_nc;
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diff changeset
322
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diff changeset
323 for (octave_idx_type i = 0; i < len; i++)
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diff changeset
324 {
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diff changeset
325 float a_element = a.elem (i, i);
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326 float b_element = b.elem (i, i);
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diff changeset
327
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diff changeset
328 if (a_element == 0.0 || b_element == 0.0)
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diff changeset
329 c.elem (i, i) = 0.0;
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330 else if (a_element == 1.0)
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diff changeset
331 c.elem (i, i) = b_element;
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332 else if (b_element == 1.0)
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diff changeset
333 c.elem (i, i) = a_element;
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diff changeset
334 else
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diff changeset
335 c.elem (i, i) = a_element * b_element;
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336 }
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diff changeset
337
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338 return c;
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diff changeset
339 }
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340
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341 // other operations
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342
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diff changeset
343 FloatColumnVector
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diff changeset
344 FloatDiagMatrix::diag (octave_idx_type k) const
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345 {
7924
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346 FloatColumnVector d;
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347
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348 octave_idx_type nnr = rows ();
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349 octave_idx_type nnc = cols ();
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350
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351 if (nnr == 0 || nnc == 0)
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352 return d;
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353
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354 if (k > 0)
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355 nnc -= k;
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356 else if (k < 0)
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357 nnr += k;
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358
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359 if (nnr > 0 && nnc > 0)
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360 {
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361 octave_idx_type ndiag = (nnr < nnc) ? nnr : nnc;
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362
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363 d.resize (ndiag);
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364
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365 if (k > 0)
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366 {
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367 for (octave_idx_type i = 0; i < ndiag; i++)
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368 d.elem (i) = elem (i, i+k);
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369 }
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370 else if ( k < 0)
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371 {
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372 for (octave_idx_type i = 0; i < ndiag; i++)
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373 d.elem (i) = elem (i-k, i);
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374 }
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375 else
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376 {
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377 for (octave_idx_type i = 0; i < ndiag; i++)
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378 d.elem (i) = elem (i, i);
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379 }
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380 }
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381 else
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382 (*current_liboctave_error_handler)
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383 ("diag: requested diagonal out of range");
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384
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385 return d;
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386 }
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387
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388 std::ostream&
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389 operator << (std::ostream& os, const FloatDiagMatrix& a)
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390 {
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391 // int field_width = os.precision () + 7;
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392
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393 for (octave_idx_type i = 0; i < a.rows (); i++)
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394 {
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395 for (octave_idx_type j = 0; j < a.cols (); j++)
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396 {
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397 if (i == j)
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398 os << " " /* setw (field_width) */ << a.elem (i, i);
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399 else
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400 os << " " /* setw (field_width) */ << 0.0;
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401 }
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402 os << "\n";
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403 }
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404 return os;
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405 }
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406
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407 /*
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408 ;;; Local Variables: ***
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409 ;;; mode: C++ ***
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410 ;;; End: ***
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411 */