kopia lustrzana https://github.com/Dsplib/libdspl-2.0
79 wiersze
1.8 KiB
C
79 wiersze
1.8 KiB
C
/*
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* Copyright (c) 2015-2024 Sergey Bakhurin
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* Digital Signal Processing Library [http://dsplib.org]
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*
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* This file is part of libdspl-2.0.
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*
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* is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DSPL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <float.h>
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#include "dspl.h"
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#include "blas.h"
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#ifdef DOXYGEN_ENGLISH
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#endif
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#ifdef DOXYGEN_RUSSIAN
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#endif
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int DSPL_API matrix_svd(double* a, int n, int m,
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double* u, double* s, double* vt, int* info)
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{
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char jobz = 'A';
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double* work = NULL;
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int* iwork = NULL;
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int lwork, mn, mx, err;
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int pi;
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if(!a || !u || !s || !vt)
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return ERROR_PTR;
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if(n < 1 || m < 1)
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return ERROR_SIZE;
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if(n > m)
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{
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mn = m;
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mx = n;
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}
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else
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{
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mn = n;
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mx = m;
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}
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err = RES_OK;
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lwork = 4 * mn * mn + 6 * mn + mx;
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work = (double*) malloc(lwork*sizeof(double));
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iwork = (int*) malloc(8*mn*sizeof(int));
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dgesdd_(&jobz, &n, &m, a, &n, s, u, &n, vt, &m, work, &lwork, iwork, &pi);
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if(info)
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*info = pi;
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if(pi)
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err = ERROR_LAPACK;
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if(work)
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free(work);
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if(iwork)
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free(iwork);
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return err;
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}
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