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Implement diag \ sparse and sparse / diag. Not pretty, but somewhat efficient and preserves sparsity.
author Jason Riedy <jason@acm.org>
date Mon, 09 Mar 2009 17:49:14 -0400
parents f4f4d65faaa0
children 1bba53c0a38d
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8964
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1 /*
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2
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3 Copyright (C) 2009 Jason Riedy
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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 "gripes.h"
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28 #include "oct-obj.h"
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29 #include "ov.h"
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30 #include "ov-typeinfo.h"
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31 #include "ops.h"
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32
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33 #include "ov-re-diag.h"
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34 #include "ov-re-sparse.h"
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35
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36 #include "sparse-xdiv.h"
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37
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38 // diagonal matrix by sparse matrix ops
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39
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40 DEFBINOP (mul_dm_sm, diag_matrix, sparse_matrix)
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41 {
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42 CAST_BINOP_ARGS (const octave_diag_matrix&, const octave_sparse_matrix&);
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43
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44 if (v2.rows() == 1 && v2.columns() == 1)
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45 // If v2 is a scalar in disguise, return a diagonal matrix rather than
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46 // a sparse matrix.
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47 {
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48 double d = v2.scalar_value ();
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49
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50 return octave_value (v1.diag_matrix_value () * d);
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51 }
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52 else
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53 {
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54 MatrixType typ = v2.matrix_type ();
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55 SparseMatrix ret = v1.diag_matrix_value () * v2.sparse_matrix_value ();
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56 octave_value out = octave_value (ret);
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57 typ.mark_as_unsymmetric ();
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58 out.matrix_type (typ);
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59 return out;
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60 }
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61 }
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62
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63 DEFBINOP (ldiv_dm_sm, diag_matrix, sparse_matrix)
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64 {
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65 CAST_BINOP_ARGS (const octave_diag_matrix&, const octave_sparse_matrix&);
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66
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67 MatrixType typ = v2.matrix_type ();
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68 return xleftdiv (v1.diag_matrix_value (), v2.sparse_matrix_value (), typ);
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69 }
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70
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71 // sparse matrix by diagonal matrix ops
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72
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73 DEFBINOP (mul_sm_dm, sparse_matrix, diag_matrix)
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74 {
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75 CAST_BINOP_ARGS (const octave_sparse_matrix&, const octave_diag_matrix&);
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76
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77 if (v1.rows() == 1 && v1.columns() == 1)
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78 // If v1 is a scalar in disguise, return a diagonal matrix rather than
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79 // a sparse matrix.
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80 {
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81 double d = v1.scalar_value ();
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82
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83 return octave_value (d * v2.diag_matrix_value ());
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84 }
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85 else
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86 {
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87 MatrixType typ = v1.matrix_type ();
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88 SparseMatrix ret = v1.sparse_matrix_value () * v2.diag_matrix_value ();
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89 octave_value out = octave_value (ret);
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90 typ.mark_as_unsymmetric ();
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91 out.matrix_type (typ);
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92 return out;
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93 }
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94 }
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95
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96 DEFBINOP (div_sm_dm, sparse_matrix, diag_matrix)
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97 {
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98 CAST_BINOP_ARGS (const octave_sparse_matrix&, const octave_diag_matrix&);
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99
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100 if (v2.rows() == 1 && v2.columns() == 1)
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101 {
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102 double d = v2.scalar_value ();
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103
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104 if (d == 0.0)
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105 gripe_divide_by_zero ();
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106
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107 return octave_value (v1.sparse_matrix_value () / d);
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108 }
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109 else
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110 {
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111 MatrixType typ = v2.matrix_type ();
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112 return xdiv (v1.sparse_matrix_value (), v2.diag_matrix_value (), typ);
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113 }
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114 }
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115
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116 void
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117 install_dm_sm_ops (void)
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118 {
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119 INSTALL_BINOP (op_mul, octave_diag_matrix, octave_sparse_matrix,
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120 mul_dm_sm);
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121
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122 INSTALL_BINOP (op_ldiv, octave_diag_matrix, octave_sparse_matrix, ldiv_dm_sm);
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123
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124 INSTALL_BINOP (op_mul, octave_sparse_matrix, octave_diag_matrix,
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125 mul_sm_dm);
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126
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127 INSTALL_BINOP (op_div, octave_sparse_matrix, octave_diag_matrix, div_sm_dm);
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128 }