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

lapack_int LAPACKE_dtgexc_work (int matrix_order, lapack_logical wantq, lapack_logical wantz, lapack_int n, double *a, lapack_int lda, double *b, lapack_int ldb, double *q, lapack_int ldq, double *z, lapack_int ldz, lapack_int *ifst, lapack_int *ilst, double *work, lapack_int lwork)

Function/Subroutine Documentation

lapack_int LAPACKE_dtgexc_work ( int  matrix_order,
lapack_logical  wantq,
lapack_logical  wantz,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  b,
lapack_int  ldb,
double *  q,
lapack_int  ldq,
double *  z,
lapack_int  ldz,
lapack_int ifst,
lapack_int ilst,
double *  work,
lapack_int  lwork 
)

Definition at line 36 of file lapacke_dtgexc_work.c.

{
lapack_int info = 0;
if( matrix_order == LAPACK_COL_MAJOR ) {
/* Call LAPACK function and adjust info */
LAPACK_dtgexc( &wantq, &wantz, &n, a, &lda, b, &ldb, q, &ldq, z, &ldz,
ifst, ilst, work, &lwork, &info );
if( info < 0 ) {
info = info - 1;
}
} else if( matrix_order == LAPACK_ROW_MAJOR ) {
lapack_int lda_t = MAX(1,n);
lapack_int ldb_t = MAX(1,n);
lapack_int ldq_t = MAX(1,n);
lapack_int ldz_t = MAX(1,n);
double* a_t = NULL;
double* b_t = NULL;
double* q_t = NULL;
double* z_t = NULL;
/* Check leading dimension(s) */
if( lda < n ) {
info = -6;
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
return info;
}
if( ldb < n ) {
info = -8;
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
return info;
}
if( ldq < n ) {
info = -10;
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
return info;
}
if( ldz < n ) {
info = -12;
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
return info;
}
/* Query optimal working array(s) size if requested */
if( lwork == -1 ) {
LAPACK_dtgexc( &wantq, &wantz, &n, a, &lda_t, b, &ldb_t, q, &ldq_t,
z, &ldz_t, ifst, ilst, work, &lwork, &info );
return (info < 0) ? (info - 1) : info;
}
/* Allocate memory for temporary array(s) */
a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
if( a_t == NULL ) {
goto exit_level_0;
}
b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
if( b_t == NULL ) {
goto exit_level_1;
}
if( wantq ) {
q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
if( q_t == NULL ) {
goto exit_level_2;
}
}
if( wantz ) {
z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
if( z_t == NULL ) {
goto exit_level_3;
}
}
/* Transpose input matrices */
LAPACKE_dge_trans( matrix_order, n, n, a, lda, a_t, lda_t );
LAPACKE_dge_trans( matrix_order, n, n, b, ldb, b_t, ldb_t );
if( wantq ) {
LAPACKE_dge_trans( matrix_order, n, n, q, ldq, q_t, ldq_t );
}
if( wantz ) {
LAPACKE_dge_trans( matrix_order, n, n, z, ldz, z_t, ldz_t );
}
/* Call LAPACK function and adjust info */
LAPACK_dtgexc( &wantq, &wantz, &n, a_t, &lda_t, b_t, &ldb_t, q_t,
&ldq_t, z_t, &ldz_t, ifst, ilst, work, &lwork, &info );
if( info < 0 ) {
info = info - 1;
}
/* Transpose output matrices */
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
if( wantq ) {
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
}
if( wantz ) {
LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
}
/* Release memory and exit */
if( wantz ) {
LAPACKE_free( z_t );
}
exit_level_3:
if( wantq ) {
LAPACKE_free( q_t );
}
exit_level_2:
LAPACKE_free( b_t );
exit_level_1:
LAPACKE_free( a_t );
exit_level_0:
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
}
} else {
info = -1;
LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
}
return info;
}

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