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annotate src/ov-lazy-idx.cc @ 14138:72c96de7a403 stable

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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents 12df7854fa7c
children
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1 /*
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2
14138
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3 Copyright (C) 2010-2012 VZLU Prague
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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 "ov-lazy-idx.h"
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28 #include "ops.h"
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29 #include "ov-scalar.h"
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30 #include "ls-oct-ascii.h"
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31 #include "ls-oct-binary.h"
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32
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33 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_lazy_index, "lazy_index", "double");
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34
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35 static octave_base_value *
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36 default_numeric_conversion_function (const octave_base_value& a)
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37 {
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38 CAST_CONV_ARG (const octave_lazy_index&);
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39
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40 return v.full_value ().clone ();
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41 }
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42
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43 octave_base_value::type_conv_info
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44 octave_lazy_index::numeric_conversion_function (void) const
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45 {
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46 return octave_base_value::type_conv_info (default_numeric_conversion_function,
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47 octave_matrix::static_type_id ());
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48 }
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49
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50 octave_base_value *
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51 octave_lazy_index::try_narrowing_conversion (void)
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52 {
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53 octave_base_value *retval = 0;
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54
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55 switch (index.length (0))
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56 {
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57 case 1:
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58 retval = new octave_scalar (static_cast<double> (index(0) + 1));
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59 break;
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60
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61 case 0:
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62 retval = new octave_matrix (NDArray (index.orig_dimensions ()));
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63 break;
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64
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65 default:
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66 break;
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67 }
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68
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69 return retval;
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70 }
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71
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72 octave_value
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73 octave_lazy_index::reshape (const dim_vector& new_dims) const
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74 {
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75 return idx_vector (index.as_array ().reshape (new_dims),
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76 index.extent (0));
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77 }
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78
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79 octave_value
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80 octave_lazy_index::permute (const Array<int>& vec, bool inv) const
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81 {
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82 // If the conversion has already been made, forward the operation.
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83 if (value.is_defined ())
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84 return value.permute (vec, inv);
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85 else
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86 return idx_vector (index.as_array ().permute (vec, inv),
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87 index.extent (0));
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88 }
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89
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90 octave_value
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91 octave_lazy_index::squeeze (void) const
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92 {
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93 return idx_vector (index.as_array ().squeeze (),
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94 index.extent (0));
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95 }
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96
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97 octave_value
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98 octave_lazy_index::sort (octave_idx_type dim, sortmode mode) const
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99 {
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100 const dim_vector odims = index.orig_dimensions ();
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101 // index_vector can employ a more efficient sorting algorithm.
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102 if (mode == ASCENDING && odims.length () == 2
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103 && (dim >= 0 && dim <= 1) && odims (1-dim) == 1)
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104 return index_vector ().sorted ();
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105 else
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106 return idx_vector (index.as_array ().sort (dim, mode),
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107 index.extent (0));
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108 }
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109
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110 octave_value
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111 octave_lazy_index::sort (Array<octave_idx_type> &sidx, octave_idx_type dim,
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112 sortmode mode) const
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113 {
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114 const dim_vector odims = index.orig_dimensions ();
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115 // index_vector can employ a more efficient sorting algorithm.
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116 if (mode == ASCENDING && odims.length () == 2
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117 && (dim >= 0 && dim <= 1) && odims (1-dim) == 1)
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118 return index_vector ().sorted (sidx);
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119 else
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120 return idx_vector (index.as_array ().sort (sidx, dim, mode),
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121 index.extent (0));
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122 }
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123
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124 sortmode
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125 octave_lazy_index::is_sorted (sortmode mode) const
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126 {
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127 if (index.is_range ())
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128 {
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129 // Avoid the array conversion.
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130 octave_idx_type inc = index.increment ();
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131 if (inc == 0)
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132 return (mode == UNSORTED ? ASCENDING : mode);
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133 else if (inc > 0)
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134 return (mode == DESCENDING ? UNSORTED : ASCENDING);
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135 else
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136 return (mode == ASCENDING ? UNSORTED : DESCENDING);
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137 }
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138 else
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139 return index.as_array ().is_sorted (mode);
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140 }
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141
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142 Array<octave_idx_type>
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143 octave_lazy_index::sort_rows_idx (sortmode mode) const
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144 {
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145 return index.as_array ().sort_rows_idx (mode);
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146 }
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147
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148 sortmode
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149 octave_lazy_index::is_sorted_rows (sortmode mode) const
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150 {
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151 return index.as_array ().is_sorted_rows (mode);
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152 }
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153
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154 static const std::string value_save_tag ("index_value");
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155
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156 bool octave_lazy_index::save_ascii (std::ostream& os)
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157 {
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158 return save_ascii_data (os, make_value (), value_save_tag, false, 0);
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159 }
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160
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161 bool octave_lazy_index::load_ascii (std::istream& is)
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162 {
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163 bool dummy;
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164
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165 std::string nm = read_ascii_data (is, std::string (), dummy, value, 0);
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166
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167 if (nm != value_save_tag)
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168 error ("lazy_index: corrupted data on load");
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169 else
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170 index = value.index_vector ();
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171
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172 return ! error_state;
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173 }
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174
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175
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176 bool octave_lazy_index::save_binary (std::ostream& os, bool& save_as_floats)
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177 {
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178 return save_binary_data (os, make_value (), value_save_tag,
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179 std::string (), false, save_as_floats);
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180 }
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181
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182 bool octave_lazy_index::load_binary (std::istream& is, bool swap,
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183 oct_mach_info::float_format fmt)
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184 {
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185 bool dummy;
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186 std::string doc;
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187
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188 std::string nm = read_binary_data (is, swap, fmt, std::string (),
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189 dummy, value, doc);
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190
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191 if (nm != value_save_tag)
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192 error ("lazy_index: corrupted data on load");
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193 else
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194 index = value.index_vector ();
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195
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196 return ! error_state;
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197 }