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annotate liboctave/dim-vector.h @ 9511:cc1fd3084cb2

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implement dim_vector::first_non_singleton
author Jaroslav Hajek <highegg@gmail.com>
date Mon, 10 Aug 2009 14:20:48 +0200
parents b096d11237be
children 11844593875a
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1 /*
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2
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3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 John W. Eaton
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4 Copyirght (C) 2009 VZLU Prague
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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 #if !defined (octave_dim_vector_h)
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25 #define octave_dim_vector_h 1
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26
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27 #include <cassert>
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28
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29 #include <sstream>
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30 #include <string>
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31
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32 #include "lo-error.h"
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33 #include "oct-types.h"
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34
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35 // Rationale: This implementation is more tricky than Array, but the big plus
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36 // is that dim_vector requires only one allocation instead of two.
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37 // It is (slightly) patterned after GCC's basic_string implementation.
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38 // rep is a pointer to an array of memory, comprising count, length,
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39 // and the data:
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40 // <count>
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41 // <ndims>
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42 // rep --> <dims[0]>
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43 // <dims[1]>
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44 // ...
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45 //
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46 // The inlines count(), ndims() recover this data
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47 // from the rep. rep points to the beginning of dims to grant
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48 // faster access (internally, reinterpret_cast is a no-op).
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49
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50 class
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51 dim_vector
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52 {
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53 private:
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54
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55 octave_idx_type *rep;
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56
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57 octave_idx_type& ndims() const
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58 { return rep[-1]; }
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59
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60 octave_idx_type& count() const
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61 { return rep[-2]; }
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62
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63 // Constructs a new rep with count = 1 and ndims given.
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64 static octave_idx_type *newrep (int ndims)
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65 {
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66 octave_idx_type *r = new octave_idx_type[ndims + 2];
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67 *r++ = 1; *r++ = ndims;
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68 return r;
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69 }
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70
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71 // Clones this->rep.
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72 octave_idx_type *clonerep (void)
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73 {
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74 int l = ndims();
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75 octave_idx_type *r = new octave_idx_type[l + 2];
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76 *r++ = 1; *r++ = l;
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77 for (int i = 0; i < l; i++)
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78 r[i] = rep[i];
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79 return r;
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80 }
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81
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82 // Clones & resizes this->rep to length n, filling by given value.
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83 octave_idx_type *resizerep (int n, octave_idx_type fill_value)
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84 {
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85 int l = ndims();
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86 if (n < 2) n = 2;
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87 octave_idx_type *r = new octave_idx_type[n + 2];
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88 *r++ = 1; *r++ = n;
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89 if (l > n) l = n;
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90 int j;
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91 for (j = 0; j < l; j++)
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92 r[j] = rep[j];
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93 for (; j < n; j++)
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94 r[j] = fill_value;
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95 return r;
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96 }
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97
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98 // Frees the rep.
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99 void freerep (void)
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100 {
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101 assert (count() == 0);
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102 delete [] (rep - 2);
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103 }
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104
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105 void make_unique (void)
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106 {
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107 if (count() > 1)
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108 {
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109 --count();
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110 rep = clonerep ();
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111 }
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112 }
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113
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114 public:
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115
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116 explicit dim_vector (octave_idx_type n)
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117 : rep (newrep (2))
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118 {
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119 rep[0] = n;
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120 rep[1] = 1;
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121 }
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122
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123 explicit dim_vector (octave_idx_type r, octave_idx_type c)
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124 : rep (newrep (2))
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125 {
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126 rep[0] = r;
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127 rep[1] = c;
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128 }
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129
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130 explicit dim_vector (octave_idx_type r, octave_idx_type c, octave_idx_type p)
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131 : rep (newrep (3))
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132 {
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133 rep[0] = r;
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134 rep[1] = c;
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135 rep[2] = p;
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136 }
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137
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138 octave_idx_type& elem (int i)
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139 {
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140 assert (i >= 0 && i < ndims());
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141 make_unique ();
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142 return rep[i];
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143 }
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144
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145 octave_idx_type elem (int i) const
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146 {
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147 assert (i >= 0 && i < ndims());
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148 return rep[i];
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149 }
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150
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151 void chop_trailing_singletons (void)
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152 {
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153 make_unique ();
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154 int l = ndims();
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155 for (int i = l - 1; i > 1; i--)
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156 {
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157 if (rep[i] == 1)
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158 l--;
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159 else
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160 break;
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161 }
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162 ndims() = l;
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163 }
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164
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165 void chop_all_singletons (void)
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166 {
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167 make_unique ();
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168 int j = 0;
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169 int l = ndims();
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170
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171 for (int i = 0; i < l; i++)
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172 {
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173 if (rep[i] != 1)
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174 rep[j++] = rep[i];
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175 }
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176
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177 if (j == 1)
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178 rep[1] = 1;
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179
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180 ndims() = j > 2 ? j : 2;
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181 }
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182
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183 private:
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184
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185 static octave_idx_type *nil_rep (void)
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186 {
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187 static dim_vector zv (0, 0);
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188 return zv.rep;
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189 }
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190
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191 explicit dim_vector (octave_idx_type *r)
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192 : rep (r) { }
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193
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194 public:
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195
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196 explicit dim_vector (void)
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197 : rep (nil_rep ()) { count()++; }
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198
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199 dim_vector (const dim_vector& dv)
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200 : rep (dv.rep) { count()++; }
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201
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202 static dim_vector alloc (int n)
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203 {
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204 return dim_vector (newrep (n < 2 ? 2 : n));
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205 }
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206
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207 dim_vector& operator = (const dim_vector& dv)
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208 {
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209 if (&dv != this)
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210 {
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211 if (--count() <= 0)
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212 freerep ();
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213
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214 rep = dv.rep;
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215 count()++;
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216 }
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217
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218 return *this;
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219 }
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220
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221 ~dim_vector (void)
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222 {
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223 if (--count() <= 0)
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224 freerep ();
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225 }
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226
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227 int length (void) const { return ndims(); }
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228
5275
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229 octave_idx_type& operator () (int i) { return elem (i); }
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230
5275
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231 octave_idx_type operator () (int i) const { return elem (i); }
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232
4887
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233 void resize (int n, int fill_value = 0)
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234 {
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235 int len = length ();
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236
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237 if (n != len)
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238 {
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239 octave_idx_type *r = resizerep (n, fill_value);
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240
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241 if (--count() <= 0)
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242 freerep ();
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243
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244 rep = r;
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245 }
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246 }
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247
4559
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248 std::string str (char sep = 'x') const
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249 {
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diff changeset
250 std::ostringstream buf;
4543
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251
4548
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252 for (int i = 0; i < length (); i++)
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253 {
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254 buf << elem (i);
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255
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256 if (i < length () - 1)
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diff changeset
257 buf << sep;
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258 }
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259
5765
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260 std::string retval = buf.str ();
4543
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261
4548
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diff changeset
262 return retval;
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diff changeset
263 }
4543
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diff changeset
264
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diff changeset
265 bool all_zero (void) const
4548
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266 {
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267 bool retval = true;
4543
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268
4548
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269 for (int i = 0; i < length (); i++)
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270 {
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271 if (elem (i) != 0)
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diff changeset
272 {
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273 retval = false;
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diff changeset
274 break;
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diff changeset
275 }
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276 }
4543
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277
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278 return retval;
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279 }
4559
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diff changeset
280
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diff changeset
281 bool any_zero (void) const
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diff changeset
282 {
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diff changeset
283 bool retval = false;
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diff changeset
284
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diff changeset
285 for (int i = 0; i < length (); i++)
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diff changeset
286 {
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diff changeset
287 if (elem (i) == 0)
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diff changeset
288 {
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diff changeset
289 retval = true;
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diff changeset
290 break;
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diff changeset
291 }
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diff changeset
292 }
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diff changeset
293
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diff changeset
294 return retval;
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diff changeset
295 }
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diff changeset
296
4635
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297 int
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diff changeset
298 num_ones (void) const
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diff changeset
299 {
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diff changeset
300 int retval = 0;
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diff changeset
301
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diff changeset
302 for (int i = 0; i < length (); i++)
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diff changeset
303 if (elem (i) == 1)
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diff changeset
304 retval++;
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diff changeset
305
f2cd320cbf6e [project @ 2003-11-20 01:48:23 by jwe]
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diff changeset
306 return retval;
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diff changeset
307 }
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diff changeset
308
4655
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diff changeset
309 bool
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diff changeset
310 all_ones (void) const
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diff changeset
311 {
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diff changeset
312 return (num_ones () == length ());
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diff changeset
313 }
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diff changeset
314
4567
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315 // This is the number of elements that a matrix with this dimension
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diff changeset
316 // vector would have, NOT the number of dimensions (elements in the
fc30061d01da [project @ 2003-10-29 20:11:15 by jwe]
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diff changeset
317 // dimension vector).
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diff changeset
318
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diff changeset
319 octave_idx_type numel (int n = 0) const
4567
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diff changeset
320 {
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diff changeset
321 int n_dims = length ();
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diff changeset
322
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diff changeset
323 octave_idx_type retval = 1;
4567
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diff changeset
324
9027
9a46ba093db4 generalize dim_vector::numel
Jaroslav Hajek <highegg@gmail.com>
parents: 8950
diff changeset
325 for (int i = n; i < n_dims; i++)
4567
fc30061d01da [project @ 2003-10-29 20:11:15 by jwe]
jwe
parents: 4565
diff changeset
326 retval *= elem (i);
fc30061d01da [project @ 2003-10-29 20:11:15 by jwe]
jwe
parents: 4565
diff changeset
327
fc30061d01da [project @ 2003-10-29 20:11:15 by jwe]
jwe
parents: 4565
diff changeset
328 return retval;
fc30061d01da [project @ 2003-10-29 20:11:15 by jwe]
jwe
parents: 4565
diff changeset
329 }
4673
6639c2574023 [project @ 2003-12-10 16:11:54 by jwe]
jwe
parents: 4655
diff changeset
330
8290
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
331 bool any_neg (void) const
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
332 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
333 int n_dims = length (), i;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
334 for (i = 0; i < n_dims; i++)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
335 if (elem (i) < 0) break;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
336 return i < n_dims;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
337 }
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
338
4735
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
339 dim_vector squeeze (void) const
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
340 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
341 dim_vector new_dims = *this;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
342
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
343 bool dims_changed = 1;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
344
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
345 int k = 0;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
346
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
347 for (int i = 0; i < length (); i++)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
348 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
349 if (elem (i) == 1)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
350 dims_changed = true;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
351 else
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
352 new_dims(k++) = elem (i);
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
353 }
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
354
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
355 if (dims_changed)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
356 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
357 if (k == 0)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
358 new_dims = dim_vector (1, 1);
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
359 else if (k == 1)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
360 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
361 // There is one non-singleton dimension, so we need
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
362 // to decide the correct orientation.
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
363
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
364 if (elem (0) == 1)
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
365 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
366 // The original dimension vector had a leading
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
367 // singleton dimension.
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
368
5275
23b37da9fd5b [project @ 2005-04-08 16:07:35 by jwe]
jwe
parents: 5105
diff changeset
369 octave_idx_type tmp = new_dims(0);
4735
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
370
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
371 new_dims.resize (2);
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
372
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
373 new_dims(0) = 1;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
374 new_dims(1) = tmp;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
375 }
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
376 else
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
377 {
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
378 // The first element of the original dimension vector
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
379 // was not a singleton dimension.
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
380
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
381 new_dims.resize (2);
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
382
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
383 new_dims(1) = 1;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
384 }
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
385 }
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
386 else
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
387 new_dims.resize(k);
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
388 }
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
389
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
390 return new_dims;
24c7bc6354ba [project @ 2004-02-05 17:26:28 by jwe]
jwe
parents: 4673
diff changeset
391 }
4915
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
392
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
393 bool concat (const dim_vector& dvb, int dim = 0)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
394 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
395 if (all_zero ())
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
396 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
397 *this = dvb;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
398 return true;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
399 }
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
400
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
401 if (dvb.all_zero ())
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
402 return true;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
403
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
404 int na = length ();
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
405 int nb = dvb.length ();
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
406
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
407 // Find the max and min value of na and nb
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
408 int n_max = na > nb ? na : nb;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
409 int n_min = na < nb ? na : nb;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
410
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
411 // The elements of the dimension vectors can only differ
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
412 // if the dim variable differs from the actual dimension
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
413 // they differ.
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
414
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
415 for (int i = 0; i < n_min; i++)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
416 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
417 if (elem(i) != dvb(i) && dim != i)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
418 return false;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
419 }
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
420
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
421 // Ditto.
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
422 for (int i = n_min; i < n_max; i++)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
423 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
424 if (na > n_min)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
425 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
426 if (elem(i) != 1 && dim != i)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
427 return false;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
428 }
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
429 else
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
430 {
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
431 if (dvb(i) != 1 && dim != i)
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
432 return false;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
433 }
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
434 }
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
435
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
436 // If we want to add the dimension vectors at a dimension
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
437 // larger than both, then we need to set n_max to this number
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
438 // so that we resize *this to the right dimension.
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
439
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
440 n_max = n_max > (dim + 1) ? n_max : (dim + 1);
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
441
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
442 // Resize *this to the appropriate dimensions.
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
443
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
444 if (n_max > na)
9507
b096d11237be dim_vector improvements
Jaroslav Hajek <highegg@gmail.com>
parents: 9420
diff changeset
445 resize (n_max, 1);
4915
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
446
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
447 // Larger or equal since dim has been decremented by one.
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
448
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
449 if (dim >= nb)
4940
954cc2ba6a49 [project @ 2004-08-24 19:30:31 by jwe]
jwe
parents: 4915
diff changeset
450 elem (dim)++;
4915
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
451 else
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
452 elem (dim) += dvb(dim);
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
453
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
454 return true;
c638c144d4da [project @ 2004-07-23 19:01:22 by jwe]
jwe
parents: 4887
diff changeset
455 }
8290
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
456
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
457 // Forces certain dimensionality, preserving numel (). Missing dimensions are
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
458 // set to 1, redundant are folded into the trailing one. If n = 1, the result
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
459 // is 2d and the second dim is 1 (dim_vectors are always at least 2D).
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
460 // If the original dimensions were all zero, the padding value is zero.
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
461 dim_vector redim (int n) const
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
462 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
463 int n_dims = length ();
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
464 if (n_dims == n)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
465 return *this;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
466 else
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
467 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
468 dim_vector retval;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
469 retval.resize (n == 1 ? 2 : n, 1);
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
470
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
471 bool zeros = true;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
472 for (int i = 0; i < n && i < n_dims; i++)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
473 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
474 retval(i) = elem (i);
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
475 zeros = zeros && elem (i) == 0;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
476 }
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
477
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
478 if (n < n_dims)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
479 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
480 octave_idx_type k = 1;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
481 for (int i = n; i < n_dims; i++)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
482 k *= elem (i);
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
483 retval(n - 1) *= k;
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
484 }
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
485 else if (zeros)
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
486 {
7cbe01c21986 improve dense array indexing
Jaroslav Hajek <highegg@gmail.com>
parents: 7017
diff changeset
487 for (int i = n_dims; i < n; i++)
7cbe01c21986 improve dense array indexing
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488 retval.elem (i) = 0;
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489 }
7cbe01c21986 improve dense array indexing
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parents: 7017
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490
7cbe01c21986 improve dense array indexing
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parents: 7017
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491 return retval;
7cbe01c21986 improve dense array indexing
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492 }
7cbe01c21986 improve dense array indexing
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493 }
8721
e9cb742df9eb imported patch sort3.diff
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494
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495 bool is_vector (void) const
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496 {
e9cb742df9eb imported patch sort3.diff
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497 return (length () == 2 && (elem (0) == 1 || elem (1) == 1));
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498 }
e9cb742df9eb imported patch sort3.diff
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parents: 8290
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499
9511
cc1fd3084cb2 implement dim_vector::first_non_singleton
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500 int first_non_singleton (int def = 0) const
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501 {
cc1fd3084cb2 implement dim_vector::first_non_singleton
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502 for (int i = 0; i < length (); i++)
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503 {
cc1fd3084cb2 implement dim_vector::first_non_singleton
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504 if (elem (i) != 1)
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505 return i;
cc1fd3084cb2 implement dim_vector::first_non_singleton
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506 }
cc1fd3084cb2 implement dim_vector::first_non_singleton
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parents: 9507
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507
cc1fd3084cb2 implement dim_vector::first_non_singleton
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508 return def;
cc1fd3084cb2 implement dim_vector::first_non_singleton
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parents: 9507
diff changeset
509 }
cc1fd3084cb2 implement dim_vector::first_non_singleton
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parents: 9507
diff changeset
510
4513
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
jwe
parents:
diff changeset
511 };
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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512
4543
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jwe
parents: 4532
diff changeset
513 static inline bool
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jwe
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diff changeset
514 operator == (const dim_vector& a, const dim_vector& b)
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diff changeset
515 {
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diff changeset
516 bool retval = true;
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diff changeset
517
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diff changeset
518 int a_len = a.length ();
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diff changeset
519 int b_len = b.length ();
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parents: 4532
diff changeset
520
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diff changeset
521 if (a_len != b_len)
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522 retval = false;
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
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523 else
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diff changeset
524 {
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diff changeset
525 for (int i = 0; i < a_len; i++)
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jwe
parents: 4532
diff changeset
526 {
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
527 if (a(i) != b(i))
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
528 {
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
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529 retval = false;
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530 break;
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jwe
parents: 4532
diff changeset
531 }
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
532 }
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
533 }
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
534
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
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parents: 4532
diff changeset
535 return retval;
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
536 }
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
537
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
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parents: 4532
diff changeset
538 static inline bool
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
539 operator != (const dim_vector& a, const dim_vector& b)
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
540 {
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
541 return ! operator == (a, b);
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
jwe
parents: 4532
diff changeset
542 }
79df15d4470c [project @ 2003-10-18 03:53:52 by jwe]
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diff changeset
543
4513
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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544 #endif
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
jwe
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545
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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diff changeset
546 /*
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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547 ;;; Local Variables: ***
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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548 ;;; mode: C++ ***
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
jwe
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549 ;;; End: ***
508238e65af7 [project @ 2003-09-19 21:40:57 by jwe]
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diff changeset
550 */