annotate liboctave/oct-convn.cc @ 11586:12df7854fa7c

strip trailing whitespace from source files
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:24:59 -0500
parents 57632dea2446
children 72c96de7a403
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2010-2011 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 <iostream>
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28 #include <algorithm>
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29
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30 #include "f77-fcn.h"
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31
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32 #include "oct-convn.h"
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33 #include "oct-locbuf.h"
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34
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35 // 2d convolution with a matrix kernel.
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36 template <class T, class R>
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37 static void
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38 convolve_2d (const T *a, octave_idx_type ma, octave_idx_type na,
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39 const R *b, octave_idx_type mb, octave_idx_type nb,
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40 T *c, bool inner);
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41
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42 // Forward instances to our Fortran implementations.
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43 #define FORWARD_IMPL(T,R,f,F) \
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44 extern "C" \
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45 F77_RET_T \
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46 F77_FUNC (f##conv2o, F##CONV2O) (const octave_idx_type&, \
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47 const octave_idx_type&, \
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48 const T*, const octave_idx_type&, \
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49 const octave_idx_type&, const R*, T *); \
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50 \
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51 extern "C" \
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52 F77_RET_T \
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53 F77_FUNC (f##conv2i, F##CONV2I) (const octave_idx_type&, \
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54 const octave_idx_type&, \
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55 const T*, const octave_idx_type&, \
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56 const octave_idx_type&, const R*, T *); \
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57 \
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58 template <> void \
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59 convolve_2d<T, R> (const T *a, octave_idx_type ma, octave_idx_type na, \
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60 const R *b, octave_idx_type mb, octave_idx_type nb, \
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61 T *c, bool inner) \
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62 { \
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63 if (inner) \
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64 F77_XFCN (f##conv2i, F##CONV2I, (ma, na, a, mb, nb, b, c)); \
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65 else \
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66 F77_XFCN (f##conv2o, F##CONV2O, (ma, na, a, mb, nb, b, c)); \
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67 }
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68
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69 FORWARD_IMPL (double, double, d, D)
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70 FORWARD_IMPL (float, float, s, S)
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71 FORWARD_IMPL (Complex, Complex, z, Z)
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72 FORWARD_IMPL (FloatComplex, FloatComplex, c, C)
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73 FORWARD_IMPL (Complex, double, zd, ZD)
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74 FORWARD_IMPL (FloatComplex, float, cs, CS)
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75
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76 template <class T, class R>
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77 void convolve_nd (const T *a, const dim_vector& ad, const dim_vector& acd,
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78 const R *b, const dim_vector& bd, const dim_vector& bcd,
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79 T *c, const dim_vector& ccd, int nd, bool inner)
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80 {
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81 if (nd == 2)
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82 convolve_2d<T, R> (a, ad(0), ad(1), b, bd(0), bd(1), c, inner);
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83 else
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84 {
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85 octave_idx_type ma = acd(nd-2), na = ad(nd-1), mb = bcd(nd-2), nb = bd(nd-1);
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86 octave_idx_type ldc = ccd(nd-2);
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87 if (inner)
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88 {
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89 for (octave_idx_type ja = 0; ja < na - nb + 1; ja++)
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90 for (octave_idx_type jb = 0; jb < nb; jb++)
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91 convolve_nd<T, R> (a + ma*(ja + jb), ad, acd, b + mb*jb, bd, bcd,
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92 c + ldc*ja, ccd, nd-1, inner);
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93 }
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94 else
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95 {
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96 for (octave_idx_type ja = 0; ja < na; ja++)
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97 for (octave_idx_type jb = 0; jb < nb; jb++)
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98 convolve_nd<T, R> (a + ma*ja, ad, acd, b + mb*jb, bd, bcd,
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99 c + ldc*(ja+jb), ccd, nd-1, inner);
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100 }
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101 }
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102 }
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103
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104 // Arbitrary convolutor.
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105 // The 2nd array is assumed to be the smaller one.
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106 template <class T, class R>
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107 static MArray<T>
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108 convolve (const MArray<T>& a, const MArray<R>& b,
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109 convn_type ct)
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110 {
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111 if (a.is_empty () || b.is_empty ())
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112 return MArray<T> ();
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113
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114 int nd = std::max (a.ndims (), b.ndims ());
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115 const dim_vector adims = a.dims ().redim (nd), bdims = b.dims ().redim (nd);
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116 dim_vector cdims = dim_vector::alloc (nd);
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117
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118 for (int i = 0; i < nd; i++)
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119 {
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120 if (ct == convn_valid)
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121 cdims(i) = std::max (adims(i) - bdims(i) + 1,
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122 static_cast<octave_idx_type> (0));
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123 else
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124 cdims(i) = std::max (adims(i) + bdims(i) - 1,
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125 static_cast<octave_idx_type> (0));
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126 }
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127
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128 MArray<T> c (cdims, T());
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129
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130 convolve_nd<T, R> (a.fortran_vec (), adims, adims.cumulative (),
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131 b.fortran_vec (), bdims, bdims.cumulative (),
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132 c.fortran_vec (), cdims.cumulative (), nd, ct == convn_valid);
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133
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134 if (ct == convn_same)
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135 {
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136 // Pick the relevant part.
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137 Array<idx_vector> sidx (dim_vector (nd, 1));
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138
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139 for (int i = 0; i < nd; i++)
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140 sidx(i) = idx_vector::make_range ((bdims(i)-1)/2, 1, adims(i));
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141 c = c.index (sidx);
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142 }
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143
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144 return c;
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145 }
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146
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147 #define CONV_DEFS(TPREF, RPREF) \
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148 TPREF ## NDArray \
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149 convn (const TPREF ## NDArray& a, const RPREF ## NDArray& b, convn_type ct) \
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150 { \
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151 return convolve (a, b, ct); \
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152 } \
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153 TPREF ## Matrix \
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154 convn (const TPREF ## Matrix& a, const RPREF ## Matrix& b, convn_type ct) \
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155 { \
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156 return convolve (a, b, ct); \
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157 } \
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158 TPREF ## Matrix \
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159 convn (const TPREF ## Matrix& a, const RPREF ## ColumnVector& c, \
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160 const RPREF ## RowVector& r, convn_type ct) \
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161 { \
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162 return convolve (a, c * r, ct); \
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163 }
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164
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165 CONV_DEFS ( , )
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166 CONV_DEFS (Complex, )
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167 CONV_DEFS (Complex, Complex)
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168 CONV_DEFS (Float, Float)
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169 CONV_DEFS (FloatComplex, Float)
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170 CONV_DEFS (FloatComplex, FloatComplex)