lapacke_dhs_nancheck.c

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* Contents: Native C interface to LAPACK utility function
* Author: Intel Corporation
* Created in February, 2010
*****************************************************************************/
#include "lapacke_utils.h"

/* Check a matrix for NaN entries. */

lapack_logical LAPACKE_dhs_nancheck( int matrix_layout, lapack_int n,
                                      const double *a,
                                      lapack_int lda )
{
    lapack_logical subdiag_nans;

    if( a == NULL ) return (lapack_logical) 0;

    /* Check subdiagonal first */
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        subdiag_nans = LAPACKE_d_nancheck( n-1, &a[1], lda+1 );
    } else if ( matrix_layout == LAPACK_ROW_MAJOR ) {
        subdiag_nans = LAPACKE_d_nancheck( n-1, &a[lda], lda+1 );
    } else {
        return (lapack_logical) 0;
    }

    /* Check upper triangular if subdiagonal has no NaNs. */
    return subdiag_nans || LAPACKE_dtr_nancheck( matrix_layout, 'u', 'n',
                                                 n, a, lda);
}