LAPACK  3.5.0
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lapacke_sgesdd_work.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_sgesdd_work (int matrix_order, char jobz, lapack_int m, lapack_int n, float *a, lapack_int lda, float *s, float *u, lapack_int ldu, float *vt, lapack_int ldvt, float *work, lapack_int lwork, lapack_int *iwork)

Function/Subroutine Documentation

lapack_int LAPACKE_sgesdd_work ( int  matrix_order,
char  jobz,
lapack_int  m,
lapack_int  n,
float *  a,
lapack_int  lda,
float *  s,
float *  u,
lapack_int  ldu,
float *  vt,
lapack_int  ldvt,
float *  work,
lapack_int  lwork,
lapack_int iwork 
)

Definition at line 36 of file lapacke_sgesdd_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_sgesdd( &jobz, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt, work,
&lwork, iwork, &info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int nrows_u = ( LAPACKE_lsame( jobz, 'a' ) ||
LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && m<n) ) ? m : 1;
lapack_int ncols_u = ( LAPACKE_lsame( jobz, 'a' ) ||
( LAPACKE_lsame( jobz, 'o' ) && m<n) ) ? m :
( LAPACKE_lsame( jobz, 's' ) ? MIN(m,n) : 1);
lapack_int nrows_vt = ( LAPACKE_lsame( jobz, 'a' ) ||
( LAPACKE_lsame( jobz, 'o' ) && m<n) ) ? n :
( LAPACKE_lsame( jobz, 's' ) ? MIN(m,n) : 1);
lapack_int lda_t = MAX(1,m);
lapack_int ldu_t = MAX(1,nrows_u);
lapack_int ldvt_t = MAX(1,nrows_vt);
float* a_t = NULL;
float* u_t = NULL;
float* vt_t = NULL;
/* Check leading dimension(s) */
if( lda < n ) {
info = -6;
LAPACKE_xerbla( "LAPACKE_sgesdd_work", info );
return info;
}
if( ldu < ncols_u ) {
info = -9;
LAPACKE_xerbla( "LAPACKE_sgesdd_work", info );
return info;
}
if( ldvt < n ) {
info = -11;
LAPACKE_xerbla( "LAPACKE_sgesdd_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( lwork == -1 ) {
LAPACK_sgesdd( &jobz, &m, &n, a, &lda_t, s, u, &ldu_t, vt, &ldvt_t,
work, &lwork, iwork, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
if( a_t == NULL ) {
goto exit_level_0;
}
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
u_t = (float*)
LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,ncols_u) );
if( u_t == NULL ) {
goto exit_level_1;
}
}
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
vt_t = (float*)LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
if( vt_t == NULL ) {
goto exit_level_2;
}
}
/* Transpose input matrices */
LAPACKE_sge_trans( matrix_order, m, n, a, lda, a_t, lda_t );
/* Call LAPACK function and adjust info */
LAPACK_sgesdd( &jobz, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
&ldvt_t, work, &lwork, iwork, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
u, ldu );
}
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
ldvt );
}
/* Release memory and exit */
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m>=n) ) ) {
LAPACKE_free( vt_t );
}
exit_level_2:
if( LAPACKE_lsame( jobz, 'a' ) || LAPACKE_lsame( jobz, 's' ) ||
( LAPACKE_lsame( jobz, 'o' ) && (m<n) ) ) {
LAPACKE_free( u_t );
}
exit_level_1:
LAPACKE_free( a_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_sgesdd_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_sgesdd_work", info );
}
return info;
}

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