Mercurial > hg > octave-nkf

annotate liboctave/array/dim-vector.cc @ 20762:f90c8372b7ba

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eliminate many more simple uses of error_state * Cell.cc, __ichol__.cc, __ilu__.cc, balance.cc, bsxfun.cc, colloc.cc, det.cc, dlmread.cc, dynamic-ld.cc, eig.cc, fft.cc, fft2.cc, fftn.cc, gcd.cc, getgrent.cc, getpwent.cc, givens.cc, hess.cc, input.cc, levenshtein.cc, load-path.cc, lookup.cc, ls-mat-ascii.cc, ls-mat4.cc, lsode.cc, lu.cc, max.cc, md5sum.cc, mex.cc, pager.cc, pinv.cc, pr-output.cc, qz.cc, schur.cc, sparse.cc, sqrtm.cc, str2double.cc, strfns.cc, sub2ind.cc, sysdep.cc, time.cc, toplev.cc, tril.cc, tsearch.cc, typecast.cc, __init_gnuplot__.cc, __magick_read__.cc, __osmesa_print__.cc, amd.cc, audiodevinfo.cc, dmperm.cc, fftw.cc, symrcm.cc, ov-base-diag.cc, ov-base-sparse.cc, ov-base.cc, ov-bool-sparse.cc, ov-builtin.cc, ov-complex.cc, ov-cx-diag.cc, ov-cx-mat.cc, ov-cx-sparse.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-float.cc, ov-flt-complex.cc, ov-flt-cx-diag.cc, ov-flt-cx-mat.cc, ov-flt-re-diag.cc, ov-flt-re-mat.cc, ov-lazy-idx.cc, ov-mex-fcn.cc, ov-perm.cc, ov-range.cc, ov-re-diag.cc, ov-re-mat.cc, ov-re-sparse.cc, ov-scalar.cc, ov-str-mat.cc, op-bm-b.cc, op-bm-bm.cc, op-sbm-b.cc, op-sbm-bm.cc, op-str-m.cc, op-str-s.cc, oct-parse.in.yy, pt-cbinop.cc, pt-colon.cc, pt-decl.cc, pt-exp.cc, pt-id.cc, pt-misc.cc, pt-select.cc, pt-unop.cc: Eliminate simple uses of error_state.
author John W. Eaton <jwe@octave.org>
date Mon, 05 Oct 2015 19:29:36 -0400
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1 /*
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2
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3 Copyright (C) 2003-2015 John W. Eaton
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4 Copyirght (C) 2009, 2010 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 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include <iostream>
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29
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30 #include "dim-vector.h"
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31
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32 // The maximum allowed value for a dimension extent. This will normally be a
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33 // tiny bit off the maximum value of octave_idx_type.
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34 // Currently 1 is subtracted to allow safe conversion of any 2D Array into
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35 // Sparse, but this offset may change in the future.
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36 octave_idx_type
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37 dim_vector::dim_max (void)
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38 {
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39 return std::numeric_limits<octave_idx_type>::max () - 1;
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40 }
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41
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42 void
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43 dim_vector::chop_all_singletons (void)
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44 {
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45 make_unique ();
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46
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47 int j = 0;
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48 int l = ndims ();
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49
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50 for (int i = 0; i < l; i++)
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51 {
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52 if (rep[i] != 1)
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53 rep[j++] = rep[i];
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54 }
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55
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56 if (j == 1)
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57 rep[1] = 1;
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58
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59 ndims () = j > 2 ? j : 2;
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60 }
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61
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62 std::string
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63 dim_vector::str (char sep) const
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64 {
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65 std::ostringstream buf;
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66
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67 for (int i = 0; i < length (); i++)
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68 {
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69 buf << elem (i);
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70
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71 if (i < length () - 1)
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72 buf << sep;
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73 }
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74
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75 std::string retval = buf.str ();
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76
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77 return retval;
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78 }
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79
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80 int
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81 dim_vector::num_ones (void) const
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82 {
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83 int retval = 0;
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84
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85 for (int i = 0; i < length (); i++)
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86 if (elem (i) == 1)
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87 retval++;
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88
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89 return retval;
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90 }
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91
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92 octave_idx_type
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93 dim_vector::safe_numel (void) const
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94 {
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95 octave_idx_type idx_max = dim_max ();
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96 octave_idx_type n = 1;
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97 int n_dims = length ();
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98
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99 for (int i = 0; i < n_dims; i++)
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100 {
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101 n *= rep[i];
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102 if (rep[i] != 0)
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103 idx_max /= rep[i];
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104 if (idx_max <= 0)
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105 throw std::bad_alloc ();
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106 }
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107
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108 return n;
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109 }
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110
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111 dim_vector
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112 dim_vector::squeeze (void) const
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113 {
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114 dim_vector new_dims = *this;
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115
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116 bool dims_changed = 1;
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117
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118 int k = 0;
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119
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120 for (int i = 0; i < length (); i++)
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121 {
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122 if (elem (i) == 1)
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123 dims_changed = true;
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124 else
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125 new_dims(k++) = elem (i);
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126 }
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127
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128 if (dims_changed)
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129 {
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130 if (k == 0)
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131 new_dims = dim_vector (1, 1);
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132 else if (k == 1)
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133 {
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134 // There is one non-singleton dimension, so we need
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135 // to decide the correct orientation.
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136
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137 if (elem (0) == 1)
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138 {
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139 // The original dimension vector had a leading
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140 // singleton dimension.
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141
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142 octave_idx_type tmp = new_dims(0);
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143
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144 new_dims.resize (2);
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145
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146 new_dims(0) = 1;
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147 new_dims(1) = tmp;
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148 }
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149 else
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150 {
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151 // The first element of the original dimension vector
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152 // was not a singleton dimension.
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153
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154 new_dims.resize (2);
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155
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156 new_dims(1) = 1;
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157 }
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158 }
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159 else
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160 new_dims.resize (k);
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161 }
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162
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163 return new_dims;
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164 }
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165
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166 // This is the rule for cat(). cat (dim, A, B) works if one
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167 // of the following holds, in this order:
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168 //
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169 // 1. size (A, k) == size (B, k) for all k != dim.
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170 // In this case, size (C, dim) = size (A, dim) + size (B, dim) and
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171 // other sizes remain intact.
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172 //
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173 // 2. A is 0x0, in which case B is the result
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174 // 3. B is 0x0, in which case A is the result
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175
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176 bool
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177 dim_vector::concat (const dim_vector& dvb, int dim)
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178 {
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179 int orig_nd = ndims ();
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180 int ndb = dvb.ndims ();
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181 int new_nd = dim < ndb ? ndb : dim + 1;
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182 if (new_nd > orig_nd)
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183 resize (new_nd, 1);
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184 else
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185 new_nd = orig_nd;
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186
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187 make_unique ();
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188
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189 bool match = true;
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190
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191 for (int i = 0; i < ndb; i++)
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192 {
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193 if (i != dim && rep[i] != dvb(i))
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194 {
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195 match = false;
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196 break;
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197 }
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198 }
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199
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200 for (int i = ndb; i < new_nd; i++)
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201 {
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202 if (i != dim && rep[i] != 1)
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203 {
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204 match = false;
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205 break;
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206 }
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207 }
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208
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209 if (match)
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210 rep[dim] += (dim < ndb ? dvb(dim) : 1);
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211 else
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212 {
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213 // Dimensions don't match. The only allowed fix is
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214 // to omit 0x0.
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215 if (ndb == 2 && dvb(0) == 0 && dvb(1) == 0)
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216 match = true;
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217 else if (orig_nd == 2 && rep[0] == 0 && rep[1] == 0)
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218 {
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219 *this = dvb;
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220 match = true;
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221 }
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222 }
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223
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224 chop_trailing_singletons ();
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225
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226 return match;
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227 }
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228
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229 // Rules for horzcat/vertcat are yet looser.
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230 // two arrays A, B can be concatenated
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231 // horizontally (dim = 2) or vertically (dim = 1) if one of the
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232 // following holds, in this order:
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233 //
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234 // 1. cat (dim, A, B) works
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235 //
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236 // 2. A, B are 2D and one of them is an empty vector, in which
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237 // case the result is the other one except if both of them
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238 // are empty vectors, in which case the result is 0x0.
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239
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240 bool
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241 dim_vector::hvcat (const dim_vector& dvb, int dim)
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242 {
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243 if (concat (dvb, dim))
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244 return true;
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245 else if (length () == 2 && dvb.length () == 2)
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246 {
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247 bool e2dv = rep[0] + rep[1] == 1;
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248 bool e2dvb = dvb(0) + dvb(1) == 1;
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249 if (e2dvb)
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250 {
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251 if (e2dv)
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252 *this = dim_vector ();
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253 return true;
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254 }
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255 else if (e2dv)
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256 {
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257 *this = dvb;
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258 return true;
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259 }
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260 }
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261
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262 return false;
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263 }
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264
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265 dim_vector
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266 dim_vector::redim (int n) const
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267 {
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268 int n_dims = length ();
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269
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270 if (n_dims == n)
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271 return *this;
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272 else if (n_dims < n)
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273 {
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274 dim_vector retval = alloc (n);
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275
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276 for (int i = 0; i < n_dims; i++)
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277 retval.rep[i] = rep[i];
10683
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278
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279 for (int i = n_dims; i < n; i++)
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280 retval.rep[i] = 1;
10683
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281
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282 return retval;
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283 }
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284 else
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285 {
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286 if (n < 1) n = 1;
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287
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288 dim_vector retval = alloc (n);
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289
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290 retval.rep[1] = 1;
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291
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292 for (int i = 0; i < n-1; i++)
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293 retval.rep[i] = rep[i];
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294
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295 int k = rep[n-1];
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296 for (int i = n; i < n_dims; i++)
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297 k *= rep[i];
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298
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299 retval.rep[n-1] = k;
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300
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301 return retval;
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302 }
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303 }