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- /* linalg/multiply.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- /* Author: G. Jungman */
- #include "gsl__config.h"
- #include <stdlib.h>
- #include "gsl_math.h"
- #include "gsl_linalg.h"
- #define SWAP_SIZE_T(a, b) do { size_t swap_tmp = a; a = b; b = swap_tmp; } while(0)
- int
- gsl_linalg_matmult (const gsl_matrix * A, const gsl_matrix * B, gsl_matrix * C)
- {
- if (A->size2 != B->size1 || A->size1 != C->size1 || B->size2 != C->size2)
- {
- GSL_ERROR ("matrix sizes are not conformant", GSL_EBADLEN);
- }
- else
- {
- double a, b;
- double temp;
- size_t i, j, k;
- for (i = 0; i < C->size1; i++)
- {
- for (j = 0; j < C->size2; j++)
- {
- a = gsl_matrix_get (A, i, 0);
- b = gsl_matrix_get (B, 0, j);
- temp = a * b;
- for (k = 1; k < A->size2; k++)
- {
- a = gsl_matrix_get (A, i, k);
- b = gsl_matrix_get (B, k, j);
- temp += a * b;
- }
- gsl_matrix_set (C, i, j, temp);
- }
- }
- return GSL_SUCCESS;
- }
- }
- int
- gsl_linalg_matmult_mod (const gsl_matrix * A, gsl_linalg_matrix_mod_t modA,
- const gsl_matrix * B, gsl_linalg_matrix_mod_t modB,
- gsl_matrix * C)
- {
- if (modA == GSL_LINALG_MOD_NONE && modB == GSL_LINALG_MOD_NONE)
- {
- return gsl_linalg_matmult (A, B, C);
- }
- else
- {
- size_t dim1_A = A->size1;
- size_t dim2_A = A->size2;
- size_t dim1_B = B->size1;
- size_t dim2_B = B->size2;
- size_t dim1_C = C->size1;
- size_t dim2_C = C->size2;
- if (modA & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (dim1_A, dim2_A);
- if (modB & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (dim1_B, dim2_B);
- if (dim2_A != dim1_B || dim1_A != dim1_C || dim2_B != dim2_C)
- {
- GSL_ERROR ("matrix sizes are not conformant", GSL_EBADLEN);
- }
- else
- {
- double a, b;
- double temp;
- size_t i, j, k;
- size_t a1, a2, b1, b2;
- for (i = 0; i < dim1_C; i++)
- {
- for (j = 0; j < dim2_C; j++)
- {
- a1 = i;
- a2 = 0;
- b1 = 0;
- b2 = j;
- if (modA & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (a1, a2);
- if (modB & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (b1, b2);
- a = gsl_matrix_get (A, a1, a2);
- b = gsl_matrix_get (B, b1, b2);
- temp = a * b;
- for (k = 1; k < dim2_A; k++)
- {
- a1 = i;
- a2 = k;
- b1 = k;
- b2 = j;
- if (modA & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (a1, a2);
- if (modB & GSL_LINALG_MOD_TRANSPOSE)
- SWAP_SIZE_T (b1, b2);
- a = gsl_matrix_get (A, a1, a2);
- b = gsl_matrix_get (B, b1, b2);
- temp += a * b;
- }
- gsl_matrix_set (C, i, j, temp);
- }
- }
- return GSL_SUCCESS;
- }
- }
- }
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