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annotate src/ov-flt-re-diag.cc @ 8834:8dd69187c4a2

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specialize sqrt for diagonal matrices
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 20 Feb 2009 21:49:26 +0100
parents 095ae5e0a831
children eb63fbe60fab
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1 /*
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2
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3 Copyright (C) 2008 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "byte-swap.h"
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28
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29 #include "ov-flt-re-diag.h"
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30 #include "ov-base-diag.cc"
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31 #include "ov-float.h"
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32 #include "ov-flt-re-mat.h"
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33 #include "ls-utils.h"
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34
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35 template class octave_base_diag<FloatDiagMatrix, FloatMatrix>;
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36
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37 DEFINE_OCTAVE_ALLOCATOR (octave_float_diag_matrix);
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38
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39 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_float_diag_matrix,
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40 "float diagonal matrix", "single");
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41
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42 static octave_base_value *
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43 default_numeric_conversion_function (const octave_base_value& a)
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44 {
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45 CAST_CONV_ARG (const octave_float_diag_matrix&);
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46
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47 return new octave_float_matrix (v.float_matrix_value ());
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48 }
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49
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50 octave_base_value::type_conv_info
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51 octave_float_diag_matrix::numeric_conversion_function (void) const
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52 {
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53 return octave_base_value::type_conv_info (default_numeric_conversion_function,
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54 octave_float_matrix::static_type_id ());
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55 }
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56
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57 octave_base_value *
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58 octave_float_diag_matrix::try_narrowing_conversion (void)
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59 {
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60 octave_base_value *retval = 0;
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61
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62 // FIXME: the proxy mechanism of DiagArray2 causes problems here.
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63 if (matrix.nelem () == 1)
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64 retval = new octave_float_scalar (float (matrix (0, 0)));
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65
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66 return retval;
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67 }
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68
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69 DiagMatrix
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70 octave_float_diag_matrix::diag_matrix_value (bool) const
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71 {
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72 return DiagMatrix (matrix);
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73 }
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74
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75 FloatDiagMatrix
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76 octave_float_diag_matrix::float_diag_matrix_value (bool) const
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77 {
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78 return matrix;
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79 }
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80
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81 ComplexDiagMatrix
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82 octave_float_diag_matrix::complex_diag_matrix_value (bool) const
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83 {
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84 return ComplexDiagMatrix (matrix);
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85 }
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86
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87 FloatComplexDiagMatrix
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88 octave_float_diag_matrix::float_complex_diag_matrix_value (bool) const
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89 {
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90 return FloatComplexDiagMatrix (matrix);
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91 }
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92
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93 octave_value
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94 octave_float_diag_matrix::abs (void) const
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95 {
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96 return matrix.abs ();
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97 }
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98
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99 octave_value
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100 octave_float_diag_matrix::real (void) const
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101 {
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102 return matrix;
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103 }
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104
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105 octave_value
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106 octave_float_diag_matrix::conj (void) const
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107 {
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108 return matrix;
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109 }
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110
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111 octave_value
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112 octave_float_diag_matrix::imag (void) const
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113 {
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114 return DiagMatrix (matrix.rows (), matrix.cols (), 0.0f);
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115 }
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116
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117 octave_value
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118 octave_float_diag_matrix::sqrt (void) const
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119 {
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120 octave_value retval;
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121
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122 static FloatNDArray::dmapper dsqrt = ::sqrtf;
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123 static FloatNDArray::cmapper csqrt = std::sqrt;
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124
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125 FloatColumnVector dvec = matrix.diag ();
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126 if (FloatMatrix (dvec).any_element_is_negative ())
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127 retval = FloatComplexDiagMatrix (dvec.map (csqrt));
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128 else
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129 retval = FloatDiagMatrix (dvec.map (dsqrt));
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130
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131 retval.resize (dims ());
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132
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133 return retval;
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134 }
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135
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136 bool
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137 octave_float_diag_matrix::save_binary (std::ostream& os,
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138 bool& /* save_as_floats*/)
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139 {
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140
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141 int32_t r = matrix.rows (), c = matrix.cols ();
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142 os.write (reinterpret_cast<char *> (&r), 4);
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143 os.write (reinterpret_cast<char *> (&c), 4);
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144
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145 FloatMatrix m = FloatMatrix (matrix.diag ());
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146 save_type st = LS_FLOAT;
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147 if (matrix.length () > 8192) // FIXME -- make this configurable.
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148 {
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149 float max_val, min_val;
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150 if (m.all_integers (max_val, min_val))
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151 st = get_save_type (max_val, min_val);
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152 }
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153
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154 const float *mtmp = m.data ();
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155 write_floats (os, mtmp, st, m.numel ());
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156
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157 return true;
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158 }
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159
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160 bool
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161 octave_float_diag_matrix::load_binary (std::istream& is, bool swap,
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162 oct_mach_info::float_format fmt)
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163 {
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164 int32_t r, c;
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165 char tmp;
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166 if (! (is.read (reinterpret_cast<char *> (&r), 4)
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167 && is.read (reinterpret_cast<char *> (&c), 4)
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168 && is.read (reinterpret_cast<char *> (&tmp), 1)))
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169 return false;
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170 if (swap)
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171 {
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172 swap_bytes<4> (&r);
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173 swap_bytes<4> (&c);
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174 }
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175
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176 FloatDiagMatrix m (r, c);
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177 float *re = m.fortran_vec ();
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178 octave_idx_type len = m.length ();
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179 read_floats (is, re, static_cast<save_type> (tmp), len, swap, fmt);
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180 if (error_state || ! is)
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181 return false;
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182 matrix = m;
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183
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184 return true;
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185 }
8398
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186
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187 bool
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188 octave_float_diag_matrix::chk_valid_scalar (const octave_value& val,
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189 float& x) const
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190 {
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191 bool retval = val.is_real_scalar ();
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192 if (retval)
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193 x = val.float_value ();
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194 return retval;
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195 }