lapacke_dtrexc.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dtrexc (int matrix_layout, char compq, lapack_int n, double *t, lapack_int ldt, double *q, lapack_int ldq, lapack_int *ifst, lapack_int *ilst)

Function Documentation

LAPACKE_dtrexc()

lapack_int LAPACKE_dtrexc	(	int	matrix_layout,
		char	compq,
		lapack_int	n,
		double *	t,
		lapack_int	ldt,
		double *	q,
		lapack_int	ldq,
		lapack_int *	ifst,
		lapack_int *	ilst )

Definition at line 35 of file lapacke_dtrexc.c.

{
    lapack_int info = 0;
    double* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dtrexc", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_lsame( compq, 'v' ) ) {
            if( LAPACKE_dge_nancheck( matrix_layout, n, n, q, ldq ) ) {
                return -6;
            }
        }
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, t, ldt ) ) {
            return -4;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    work = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dtrexc_work( matrix_layout, compq, n, t, ldt, q, ldq, ifst,
                                ilst, work );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dtrexc", info );
    }
    return info;
}