Mercurial > octave
annotate libinterp/corefcn/kron.cc @ 33623:4517f929c59d bytecode-interpreter tip
maint: Merge default to bytecode-interpreter
author | Arun Giridhar <arungiridhar@gmail.com> |
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date | Fri, 24 May 2024 16:22:41 -0400 |
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1 //////////////////////////////////////////////////////////////////////// |
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2 // |
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3 // Copyright (C) 2002-2024 The Octave Project Developers |
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4 // |
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5 // See the file COPYRIGHT.md in the top-level directory of this |
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6 // distribution or <https://octave.org/copyright/>. |
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7 // |
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8 // This file is part of Octave. |
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9 // |
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10 // Octave is free software: you can redistribute it and/or modify it |
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11 // under the terms of the GNU General Public License as published by |
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12 // the Free Software Foundation, either version 3 of the License, or |
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13 // (at your option) any later version. |
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14 // |
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15 // Octave is distributed in the hope that it will be useful, but |
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 // GNU General Public License for more details. |
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19 // |
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20 // You should have received a copy of the GNU General Public License |
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21 // along with Octave; see the file COPYING. If not, see |
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22 // <https://www.gnu.org/licenses/>. |
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23 // |
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24 //////////////////////////////////////////////////////////////////////// |
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26 #if defined (HAVE_CONFIG_H) |
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27 # include "config.h" |
3910 | 28 #endif |
29 | |
30 #include "dMatrix.h" | |
10461 | 31 #include "fMatrix.h" |
3910 | 32 #include "CMatrix.h" |
10461 | 33 #include "fCMatrix.h" |
34 | |
35 #include "dSparse.h" | |
36 #include "CSparse.h" | |
37 | |
38 #include "dDiagMatrix.h" | |
39 #include "fDiagMatrix.h" | |
40 #include "CDiagMatrix.h" | |
41 #include "fCDiagMatrix.h" | |
42 | |
43 #include "PermMatrix.h" | |
44 | |
45 #include "mx-inlines.cc" | |
4153 | 46 #include "quit.h" |
3910 | 47 |
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48 #include "defun.h" |
3910 | 49 #include "error.h" |
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50 #include "ovl.h" |
3910 | 51 |
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52 OCTAVE_BEGIN_NAMESPACE(octave) |
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53 |
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54 template <typename R, typename T> |
10461 | 55 static MArray<T> |
56 kron (const MArray<R>& a, const MArray<T>& b) | |
57 { | |
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58 panic_unless (a.ndims () == 2); |
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59 panic_unless (b.ndims () == 2); |
10461 | 60 |
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61 octave_idx_type nra = a.rows (); |
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62 octave_idx_type nrb = b.rows (); |
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63 octave_idx_type nca = a.cols (); |
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64 octave_idx_type ncb = b.cols (); |
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66 MArray<T> c (dim_vector (nra*nrb, nca*ncb)); |
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67 T *cv = c.rwdata (); |
10461 | 68 |
69 for (octave_idx_type ja = 0; ja < nca; ja++) | |
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70 { |
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71 octave_quit (); |
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72 for (octave_idx_type jb = 0; jb < ncb; jb++) |
10461 | 73 { |
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74 for (octave_idx_type ia = 0; ia < nra; ia++) |
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75 { |
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76 mx_inline_mul (nrb, cv, a(ia, ja), b.data () + nrb*jb); |
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77 cv += nrb; |
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78 } |
10461 | 79 } |
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80 } |
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81 |
10461 | 82 return c; |
83 } | |
84 | |
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85 template <typename R, typename T> |
10461 | 86 static MArray<T> |
87 kron (const MDiagArray2<R>& a, const MArray<T>& b) | |
88 { | |
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89 panic_unless (b.ndims () == 2); |
10461 | 90 |
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91 octave_idx_type nra = a.rows (); |
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92 octave_idx_type nrb = b.rows (); |
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93 octave_idx_type dla = a.diag_length (); |
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94 octave_idx_type nca = a.cols (); |
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95 octave_idx_type ncb = b.cols (); |
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96 |
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97 MArray<T> c (dim_vector (nra*nrb, nca*ncb), T ()); |
10461 | 98 |
99 for (octave_idx_type ja = 0; ja < dla; ja++) | |
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100 { |
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101 octave_quit (); |
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102 for (octave_idx_type jb = 0; jb < ncb; jb++) |
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103 { |
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104 mx_inline_mul (nrb, &c.xelem (ja*nrb, ja*ncb + jb), a.dgelem (ja), |
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105 b.data () + nrb*jb); |
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106 } |
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107 } |
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109 return c; | |
110 } | |
3910 | 111 |
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112 template <typename T> |
10461 | 113 static MSparse<T> |
114 kron (const MSparse<T>& A, const MSparse<T>& B) | |
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115 { |
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116 octave_idx_type idx = 0; |
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117 MSparse<T> C (A.rows () * B.rows (), A.columns () * B.columns (), |
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118 A.nnz () * B.nnz ()); |
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119 |
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120 C.cidx (0) = 0; |
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121 |
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122 for (octave_idx_type Aj = 0; Aj < A.columns (); Aj++) |
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123 { |
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124 octave_quit (); |
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125 for (octave_idx_type Bj = 0; Bj < B.columns (); Bj++) |
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126 { |
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127 for (octave_idx_type Ai = A.cidx (Aj); Ai < A.cidx (Aj+1); Ai++) |
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128 { |
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129 octave_idx_type Ci = A.ridx (Ai) * B.rows (); |
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130 const T v = A.data (Ai); |
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131 |
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132 for (octave_idx_type Bi = B.cidx (Bj); Bi < B.cidx (Bj+1); Bi++) |
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133 { |
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134 C.data (idx) = v * B.data (Bi); |
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135 C.ridx (idx++) = Ci + B.ridx (Bi); |
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136 } |
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137 } |
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138 C.cidx (Aj * B.columns () + Bj + 1) = idx; |
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139 } |
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140 } |
10461 | 141 |
142 return C; | |
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143 } |
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144 |
10461 | 145 static PermMatrix |
146 kron (const PermMatrix& a, const PermMatrix& b) | |
147 { | |
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148 octave_idx_type na = a.rows (); |
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149 octave_idx_type nb = b.rows (); |
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150 const Array<octave_idx_type>& pa = a.col_perm_vec (); |
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151 const Array<octave_idx_type>& pb = b.col_perm_vec (); |
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152 Array<octave_idx_type> res_perm (dim_vector (na * nb, 1)); |
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153 octave_idx_type rescol = 0; |
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154 for (octave_idx_type i = 0; i < na; i++) |
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156 octave_idx_type a_add = pa(i) * nb; |
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157 for (octave_idx_type j = 0; j < nb; j++) |
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158 res_perm.xelem (rescol++) = a_add + pb(j); |
10461 | 159 } |
160 | |
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161 return PermMatrix (res_perm, true); |
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163 |
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164 template <typename MTA, typename MTB> |
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166 do_kron (const octave_value& a, const octave_value& b) | |
167 { | |
168 MTA am = octave_value_extract<MTA> (a); | |
169 MTB bm = octave_value_extract<MTB> (b); | |
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170 |
10461 | 171 return octave_value (kron (am, bm)); |
172 } | |
173 | |
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174 octave_value |
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175 dispatch_kron (const octave_value& a, const octave_value& b) |
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176 { |
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177 octave_value retval; |
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178 if (a.is_perm_matrix () && b.is_perm_matrix ()) |
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179 retval = do_kron<PermMatrix, PermMatrix> (a, b); |
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180 else if (a.issparse () || b.issparse ()) |
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181 { |
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182 if (a.iscomplex () || b.iscomplex ()) |
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183 retval = do_kron<SparseComplexMatrix, SparseComplexMatrix> (a, b); |
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184 else |
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185 retval = do_kron<SparseMatrix, SparseMatrix> (a, b); |
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186 } |
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187 else if (a.is_diag_matrix ()) |
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188 { |
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189 if (b.is_diag_matrix () && a.rows () == a.columns () |
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190 && b.rows () == b.columns ()) |
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191 { |
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192 // We have two diagonal matrices, the product of those will be |
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193 // another diagonal matrix. To do that efficiently, extract |
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194 // the diagonals as vectors and compute the product. That |
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195 // will be another vector, which we then use to construct a |
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196 // diagonal matrix object. Note that this will fail if our |
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197 // digaonal matrix object is modified to allow the nonzero |
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198 // values to be stored off of the principal diagonal (i.e., if |
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199 // diag ([1,2], 3) is modified to return a diagonal matrix |
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200 // object instead of a full matrix object). |
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201 |
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202 octave_value tmp = dispatch_kron (a.diag (), b.diag ()); |
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203 retval = tmp.diag (); |
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204 } |
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205 else if (a.is_single_type () || b.is_single_type ()) |
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206 { |
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207 if (a.iscomplex ()) |
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208 retval = do_kron<FloatComplexDiagMatrix, FloatComplexMatrix> (a, b); |
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209 else if (b.iscomplex ()) |
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210 retval = do_kron<FloatDiagMatrix, FloatComplexMatrix> (a, b); |
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211 else |
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212 retval = do_kron<FloatDiagMatrix, FloatMatrix> (a, b); |
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213 } |
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214 else |
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215 { |
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216 if (a.iscomplex ()) |
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217 retval = do_kron<ComplexDiagMatrix, ComplexMatrix> (a, b); |
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218 else if (b.iscomplex ()) |
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219 retval = do_kron<DiagMatrix, ComplexMatrix> (a, b); |
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220 else |
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221 retval = do_kron<DiagMatrix, Matrix> (a, b); |
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222 } |
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223 } |
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224 else if (a.is_single_type () || b.is_single_type ()) |
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225 { |
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226 if (a.iscomplex ()) |
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227 retval = do_kron<FloatComplexMatrix, FloatComplexMatrix> (a, b); |
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228 else if (b.iscomplex ()) |
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229 retval = do_kron<FloatMatrix, FloatComplexMatrix> (a, b); |
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230 else |
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231 retval = do_kron<FloatMatrix, FloatMatrix> (a, b); |
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232 } |
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233 else |
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234 { |
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235 if (a.iscomplex ()) |
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236 retval = do_kron<ComplexMatrix, ComplexMatrix> (a, b); |
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237 else if (b.iscomplex ()) |
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238 retval = do_kron<Matrix, ComplexMatrix> (a, b); |
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239 else |
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240 retval = do_kron<Matrix, Matrix> (a, b); |
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241 } |
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242 return retval; |
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243 } |
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244 |
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246 DEFUN (kron, args, , |
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247 doc: /* -*- texinfo -*- |
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248 @deftypefn {} {@var{C} =} kron (@var{A}, @var{B}) |
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249 @deftypefnx {} {@var{C} =} kron (@var{A1}, @var{A2}, @dots{}) |
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250 Form the Kronecker product of two or more matrices. |
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251 |
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252 This is defined block by block as |
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253 |
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254 @example |
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255 c = [ a(i,j)*b ] |
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256 @end example |
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257 |
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258 For example: |
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259 |
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260 @example |
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261 @group |
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262 kron (1:4, ones (3, 1)) |
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263 @result{} 1 2 3 4 |
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264 1 2 3 4 |
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265 1 2 3 4 |
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266 @end group |
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267 @end example |
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268 |
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269 If there are more than two input arguments @var{A1}, @var{A2}, @dots{}, |
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270 @var{An} the Kronecker product is computed as |
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271 |
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272 @example |
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273 kron (kron (@var{A1}, @var{A2}), @dots{}, @var{An}) |
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274 @end example |
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275 |
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276 @noindent |
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277 Since the Kronecker product is associative, this is well-defined. |
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278 @seealso{tensorprod} |
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279 @end deftypefn */) |
3910 | 280 { |
281 int nargin = args.length (); | |
282 | |
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283 if (nargin < 2) |
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284 print_usage (); |
3910 | 285 |
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286 octave_value retval; |
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287 |
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288 octave_value a = args(0); |
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289 octave_value b = args(1); |
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290 |
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291 retval = dispatch_kron (a, b); |
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292 |
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293 for (octave_idx_type i = 2; i < nargin; i++) |
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294 retval = dispatch_kron (retval, args(i)); |
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295 |
3910 | 296 return retval; |
297 } | |
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298 |
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299 /* |
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300 %!test |
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301 %! x = ones (2); |
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302 %! assert (kron (x, x), ones (4)); |
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303 |
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304 %!shared x, y, z, p1, p2, d1, d2 |
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305 %! x = [1, 2]; |
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306 %! y = [-1, -2]; |
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307 %! z = [1, 2, 3, 4; 1, 2, 3, 4; 1, 2, 3, 4]; |
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308 %! p1 = eye (3)([2, 3, 1], :); ## Permutation matrix |
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309 %! p2 = [0 1 0; 0 0 1; 1 0 0]; ## Non-permutation equivalent |
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310 %! d1 = diag ([1 2 3]); ## Diag type matrix |
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311 %! d2 = [1 0 0; 0 2 0; 0 0 3]; ## Non-diag equivalent |
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312 %!assert (kron (1:4, ones (3, 1)), z) |
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313 %!assert (kron (single (1:4), ones (3, 1)), single (z)) |
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314 %!assert (kron (sparse (1:4), ones (3, 1)), sparse (z)) |
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315 %!assert (kron (complex (1:4), ones (3, 1)), z) |
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316 %!assert (kron (complex (single (1:4)), ones (3, 1)), single (z)) |
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317 %!assert (kron (x, y, z), kron (kron (x, y), z)) |
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318 %!assert (kron (x, y, z), kron (x, kron (y, z))) |
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319 %!assert (kron (p1, p1), kron (p2, p2)) |
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320 %!assert (kron (p1, p2), kron (p2, p1)) |
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321 %!assert (kron (d1, d1), kron (d2, d2)) |
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322 %!assert (kron (d1, d2), kron (d2, d1)) |
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323 |
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324 %!assert (kron (diag ([1, 2]), diag ([3, 4])), diag ([3, 4, 6, 8])) |
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325 |
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326 ## Test for two diag matrices. |
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327 ## See the comments above in dispatch_kron for this case. |
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328 %!test |
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329 %! expected = zeros (16, 16); |
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330 %! expected (1, 11) = 3; |
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331 %! expected (2, 12) = 4; |
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332 %! expected (5, 15) = 6; |
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333 %! expected (6, 16) = 8; |
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334 %! assert (kron (diag ([1, 2], 2), diag ([3, 4], 2)), expected); |
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335 */ |
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336 |
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337 OCTAVE_END_NAMESPACE(octave) |