lapacke_dorcsd2by1.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dorcsd2by1 (int matrix_layout, char jobu1, char jobu2, char jobv1t, lapack_int m, lapack_int p, lapack_int q, double *x11, lapack_int ldx11, double *x21, lapack_int ldx21, double *theta, double *u1, lapack_int ldu1, double *u2, lapack_int ldu2, double *v1t, lapack_int ldv1t)

Function Documentation

LAPACKE_dorcsd2by1()

lapack_int LAPACKE_dorcsd2by1	(	int	matrix_layout,
		char	jobu1,
		char	jobu2,
		char	jobv1t,
		lapack_int	m,
		lapack_int	p,
		lapack_int	q,
		double *	x11,
		lapack_int	ldx11,
		double *	x21,
		lapack_int	ldx21,
		double *	theta,
		double *	u1,
		lapack_int	ldu1,
		double *	u2,
		lapack_int	ldu2,
		double *	v1t,
		lapack_int	ldv1t )

Definition at line 35 of file lapacke_dorcsd2by1.c.

{
    lapack_int info = 0;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* work = NULL;
    double work_query;
    lapack_int nrows_x11, nrows_x21;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dorcsd2by1", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        nrows_x11 = p;
        nrows_x21 = m-p;
        if( LAPACKE_dge_nancheck( matrix_layout, nrows_x11, q, x11, ldx11 ) ) {
            return -8;
        }
 
        if( LAPACKE_dge_nancheck( matrix_layout, nrows_x21, q, x21, ldx21 ) ) {
            return -9;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,m-MIN(MIN(p,m-p),MIN(q,m-q))) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_dorcsd2by1_work( matrix_layout, jobu1, jobu2, jobv1t, m, p, q,
                                x11, ldx11, x21, ldx21, theta, u1, ldu1, u2,
                                ldu2, v1t, ldv1t, &work_query,
                                lwork, iwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dorcsd2by1_work( matrix_layout, jobu1, jobu2, jobv1t, m, p, q,
                                x11, ldx11, x21, ldx21, theta, u1, ldu1, u2,
                                ldu2, v1t, ldv1t, work, lwork, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dorcsd2by1", info );
    }
    return info;
}