LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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lapacke_dtgsna.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_dtgsna (int matrix_order, char job, char howmny, const lapack_logical *select, lapack_int n, const double *a, lapack_int lda, const double *b, lapack_int ldb, const double *vl, lapack_int ldvl, const double *vr, lapack_int ldvr, double *s, double *dif, lapack_int mm, lapack_int *m)

Function/Subroutine Documentation

lapack_int LAPACKE_dtgsna ( int  matrix_order,
char  job,
char  howmny,
const lapack_logical select,
lapack_int  n,
const double *  a,
lapack_int  lda,
const double *  b,
lapack_int  ldb,
const double *  vl,
lapack_int  ldvl,
const double *  vr,
lapack_int  ldvr,
double *  s,
double *  dif,
lapack_int  mm,
lapack_int m 
)

Definition at line 36 of file lapacke_dtgsna.c.

{
lapack_int info = 0;
lapack_int lwork = -1;
lapack_int* iwork = NULL;
double* work = NULL;
double work_query;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_dtgsna", -1 );
return -1;
}
#ifndef LAPACK_DISABLE_NAN_CHECK
/* Optionally check input matrices for NaNs */
if( LAPACKE_dge_nancheck( matrix_order, n, n, a, lda ) ) {
return -6;
}
if( LAPACKE_dge_nancheck( matrix_order, n, n, b, ldb ) ) {
return -8;
}
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
if( LAPACKE_dge_nancheck( matrix_order, n, mm, vl, ldvl ) ) {
return -10;
}
}
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'e' ) ) {
if( LAPACKE_dge_nancheck( matrix_order, n, mm, vr, ldvr ) ) {
return -12;
}
}
#endif
/* Allocate memory for working array(s) */
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n+6) );
if( iwork == NULL ) {
goto exit_level_0;
}
}
/* Query optimal working array(s) size */
info = LAPACKE_dtgsna_work( matrix_order, job, howmny, select, n, a, lda, b,
ldb, vl, ldvl, vr, ldvr, s, dif, mm, m,
&work_query, lwork, iwork );
if( info != 0 ) {
goto exit_level_1;
}
lwork = (lapack_int)work_query;
/* Allocate memory for work arrays */
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
if( work == NULL ) {
goto exit_level_1;
}
}
/* Call middle-level interface */
info = LAPACKE_dtgsna_work( matrix_order, job, howmny, select, n, a, lda, b,
ldb, vl, ldvl, vr, ldvr, s, dif, mm, m, work,
lwork, iwork );
/* Release memory and exit */
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
LAPACKE_free( work );
}
exit_level_1:
if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'v' ) ) {
LAPACKE_free( iwork );
}
exit_level_0:
if( info == LAPACK_WORK_MEMORY_ERROR ) {
LAPACKE_xerbla( "LAPACKE_dtgsna", info );
}
return info;
}

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