lapacke_dge_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_dge_nancheck( int matrix_layout, lapack_int m,
                                      lapack_int n,
                                      const double *a,
                                      lapack_int lda )
{
    lapack_int i, j;

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

    if( matrix_layout == LAPACK_COL_MAJOR ) {
        for( j = 0; j < n; j++ ) {
            for( i = 0; i < MIN( m, lda ); i++ ) {
                if( LAPACK_DISNAN( a[i+(size_t)j*lda] ) )
                    return (lapack_logical) 1;
            }
        }
    } else if ( matrix_layout == LAPACK_ROW_MAJOR ) {
        for( i = 0; i < m; i++ ) {
            for( j = 0; j < MIN( n, lda ); j++ ) {
                if( LAPACK_DISNAN( a[(size_t)i*lda+j] ) )
                    return (lapack_logical) 1;
            }
        }
    }
    return (lapack_logical) 0;
}