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

lapack_int LAPACKE_shseqr_work (int matrix_order, char job, char compz, lapack_int n, lapack_int ilo, lapack_int ihi, float *h, lapack_int ldh, float *wr, float *wi, float *z, lapack_int ldz, float *work, lapack_int lwork)

Function/Subroutine Documentation

lapack_int LAPACKE_shseqr_work ( int  matrix_order,
char  job,
char  compz,
lapack_int  n,
lapack_int  ilo,
lapack_int  ihi,
float *  h,
lapack_int  ldh,
float *  wr,
float *  wi,
float *  z,
lapack_int  ldz,
float *  work,
lapack_int  lwork 
)

Definition at line 36 of file lapacke_shseqr_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh, wr, wi, z, &ldz,
work, &lwork, &info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int ldh_t = MAX(1,n);
lapack_int ldz_t = MAX(1,n);
float* h_t = NULL;
float* z_t = NULL;
/* Check leading dimension(s) */
if( ldh < n ) {
info = -8;
LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
return info;
}
if( ldz < n ) {
info = -12;
LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( lwork == -1 ) {
LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h, &ldh_t, wr, wi, z,
&ldz_t, work, &lwork, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
h_t = (float*)LAPACKE_malloc( sizeof(float) * ldh_t * MAX(1,n) );
if( h_t == NULL ) {
goto exit_level_0;
}
if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
z_t = (float*)LAPACKE_malloc( sizeof(float) * ldz_t * MAX(1,n) );
if( z_t == NULL ) {
goto exit_level_1;
}
}
/* Transpose input matrices */
LAPACKE_sge_trans( matrix_order, n, n, h, ldh, h_t, ldh_t );
if( LAPACKE_lsame( compz, 'v' ) ) {
LAPACKE_sge_trans( matrix_order, n, n, z, ldz, z_t, ldz_t );
}
/* Call LAPACK function and adjust info */
LAPACK_shseqr( &job, &compz, &n, &ilo, &ihi, h_t, &ldh_t, wr, wi, z_t,
&ldz_t, work, &lwork, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, h_t, ldh_t, h, ldh );
if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
}
/* Release memory and exit */
if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
LAPACKE_free( z_t );
}
exit_level_1:
LAPACKE_free( h_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_shseqr_work", info );
}
return info;
}

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