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annotate liboctave/array/DiagArray2.h @ 17524:534247e14b03

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Merge the official development
author LYH <lyh.kernel@gmail.com>
date Fri, 27 Sep 2013 03:01:11 +0800
parents 3e101e8b3dac
children
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1 // Template array classes
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2 /*
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3
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4 Copyright (C) 1996-2012 John W. Eaton
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5 Copyright (C) 2008-2009 Jaroslav Hajek
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6 Copyright (C) 2010 VZLU Prague
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7
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8 This file is part of Octave.
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9
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10 Octave is free software; you can redistribute it and/or modify it
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11 under the terms of the GNU General Public License as published by the
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12 Free Software Foundation; either version 3 of the License, or (at your
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13 option) any later version.
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14
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15 Octave is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 for more details.
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19
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20 You should have received a copy of the GNU General Public License
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21 along with Octave; see the file COPYING. If not, see
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22 <http://www.gnu.org/licenses/>.
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23
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24 */
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25
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26 #if !defined (octave_DiagArray2_h)
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27 #define octave_DiagArray2_h 1
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28
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29 #include <cassert>
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30 #include <cstdlib>
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31
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32 #include "Array.h"
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33
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34 // Array<T> is inherited privately so that some methods, like index, don't
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35 // produce unexpected results.
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36
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37 template <class T>
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38 class
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39 DiagArray2 : protected Array<T>
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40 {
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41 protected:
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42 octave_idx_type d1, d2;
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43
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44 public:
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45
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46 using typename Array<T>::element_type;
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47
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48 DiagArray2 (void)
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49 : Array<T> (), d1 (0), d2 (0) { }
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50
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51 DiagArray2 (octave_idx_type r, octave_idx_type c)
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52 : Array<T> (dim_vector (std::min (r, c), 1)), d1 (r), d2 (c) { }
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53
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54 DiagArray2 (octave_idx_type r, octave_idx_type c, const T& val)
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55 : Array<T> (dim_vector (std::min (r, c), 1), val), d1 (r), d2 (c) { }
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56
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57 explicit DiagArray2 (const Array<T>& a)
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58 : Array<T> (a.as_column ()), d1 (a.numel ()), d2 (a.numel ()) { }
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59
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60 DiagArray2 (const Array<T>& a, octave_idx_type r, octave_idx_type c);
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61
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62 DiagArray2 (const DiagArray2<T>& a)
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63 : Array<T> (a), d1 (a.d1), d2 (a.d2) { }
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64
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65 template <class U>
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66 DiagArray2 (const DiagArray2<U>& a)
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67 : Array<T> (a.extract_diag ()), d1 (a.dim1 ()), d2 (a.dim2 ()) { }
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68
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69 ~DiagArray2 (void) { }
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70
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71 DiagArray2<T>& operator = (const DiagArray2<T>& a)
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72 {
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73 if (this != &a)
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74 {
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75 Array<T>::operator = (a);
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76 d1 = a.d1;
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77 d2 = a.d2;
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78 }
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79
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80 return *this;
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81 }
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82
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83 octave_idx_type dim1 (void) const { return d1; }
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84 octave_idx_type dim2 (void) const { return d2; }
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85
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86 octave_idx_type rows (void) const { return dim1 (); }
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87 octave_idx_type cols (void) const { return dim2 (); }
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88 octave_idx_type columns (void) const { return dim2 (); }
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89
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90 octave_idx_type diag_length (void) const { return Array<T>::length (); }
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91 // FIXME: a dangerous ambiguity?
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92 octave_idx_type length (void) const { return Array<T>::length (); }
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93 octave_idx_type nelem (void) const { return dim1 () * dim2 (); }
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94 octave_idx_type numel (void) const { return nelem (); }
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95
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96 size_t byte_size (void) const { return Array<T>::byte_size (); }
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97
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98 dim_vector dims (void) const { return dim_vector (d1, d2); }
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99
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100 Array<T> diag (octave_idx_type k = 0) const GCC_ATTR_DEPRECATED;
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101 Array<T> extract_diag (octave_idx_type k = 0) const;
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102 DiagArray2<T> build_diag_matrix () const
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103 {
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104 return DiagArray2<T> (array_value ());
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105 }
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106
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107 // Warning: the non-const two-index versions will silently ignore assignments
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108 // to off-diagonal elements.
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109
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110 T elem (octave_idx_type r, octave_idx_type c) const
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111 {
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112 return (r == c) ? Array<T>::elem (r) : T (0);
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113 }
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114
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115 T& elem (octave_idx_type r, octave_idx_type c)
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116 {
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117 static T zero (0);
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118 return (r == c) ? Array<T>::elem (r) : zero;
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119 }
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120
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121 T dgelem (octave_idx_type i) const
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122 { return Array<T>::elem (i); }
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123
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124 T& dgelem (octave_idx_type i)
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125 { return Array<T>::elem (i); }
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126
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127 T checkelem (octave_idx_type r, octave_idx_type c) const
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128 {
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129 return check_idx (r, c) ? elem (r, c) : T (0);
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130 }
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131
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132 T operator () (octave_idx_type r, octave_idx_type c) const
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133 {
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134 #if defined (BOUNDS_CHECKING)
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135 return checkelem (r, c);
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136 #else
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137 return elem (r, c);
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138 #endif
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139 }
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140
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141 T& checkelem (octave_idx_type r, octave_idx_type c)
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142 {
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143 static T zero (0);
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144 return check_idx (r, c) ? elem (r, c) : zero;
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145 }
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146
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147 T& operator () (octave_idx_type r, octave_idx_type c)
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148 {
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149 #if defined (BOUNDS_CHECKING)
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150 return checkelem (r, c);
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151 #else
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152 return elem (r, c);
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153 #endif
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154 }
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155
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156 // No checking.
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157
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158 T xelem (octave_idx_type r, octave_idx_type c) const
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159 {
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160 return (r == c) ? Array<T>::xelem (r) : T (0);
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161 }
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162
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163 T& dgxelem (octave_idx_type i)
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164 { return Array<T>::xelem (i); }
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165
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166 T dgxelem (octave_idx_type i) const
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167 { return Array<T>::xelem (i); }
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168
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169 void resize (octave_idx_type n, octave_idx_type m, const T& rfv);
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170 void resize (octave_idx_type n, octave_idx_type m)
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171 {
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172 resize (n, m, Array<T>::resize_fill_value ());
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173 }
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174
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175 DiagArray2<T> transpose (void) const;
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176 DiagArray2<T> hermitian (T (*fcn) (const T&) = 0) const;
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177
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178 Array<T> array_value (void) const;
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179
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180 const T *data (void) const { return Array<T>::data (); }
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181
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182 const T *fortran_vec (void) const { return Array<T>::fortran_vec (); }
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183
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184 T *fortran_vec (void) { return Array<T>::fortran_vec (); }
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185
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186 void print_info (std::ostream& os, const std::string& prefix) const
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187 { Array<T>::print_info (os, prefix); }
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188
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189 private:
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190
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191 bool check_idx (octave_idx_type r, octave_idx_type c) const;
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192 };
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193
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194 #endif