lapacke_dsteqr.c

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******************************************************************************
* Contents: Native high-level C interface to LAPACK function dsteqr
* Author: Intel Corporation
* Generated October, 2010
*****************************************************************************/

#include "lapacke.h"
#include "lapacke_utils.h"

lapack_int LAPACKE_dsteqr( int matrix_order, char compz, lapack_int n,
                           double* d, double* e, double* z, lapack_int ldz )
{
    lapack_int info = 0;
    /* Additional scalars declarations for work arrays */
    lapack_int lwork;
    double* work = NULL;
    if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dsteqr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    /* Optionally check input matrices for NaNs */
    if( LAPACKE_d_nancheck( n, d, 1 ) ) {
        return -4;
    }
    if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
        return -5;
    }
    if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
        if( LAPACKE_dge_nancheck( matrix_order, n, n, z, ldz ) ) {
            return -6;
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( compz, 'n' ) ) {
        lwork = 1;
    } else {
        lwork = MAX(1,2*n-2);
    }
    /* Allocate memory for working array(s) */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dsteqr_work( matrix_order, compz, n, d, e, z, ldz, work );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dsteqr", info );
    }
    return info;
}