lapacke_shs_nancheck.c
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00001 /*****************************************************************************
00002   Copyright (c) 2010, Intel Corp.
00003   All rights reserved.
00004 
00005   Redistribution and use in source and binary forms, with or without
00006   modification, are permitted provided that the following conditions are met:
00007 
00008     * Redistributions of source code must retain the above copyright notice,
00009       this list of conditions and the following disclaimer.
00010     * Redistributions in binary form must reproduce the above copyright
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00012       documentation and/or other materials provided with the distribution.
00013     * Neither the name of Intel Corporation nor the names of its contributors
00014       may be used to endorse or promote products derived from this software
00015       without specific prior written permission.
00016 
00017   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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00028 ******************************************************************************
00029 * Contents: Native C interface to LAPACK utility function
00030 * Author: Intel Corporation
00031 * Created in February, 2010
00032 *****************************************************************************/
00033 #include "lapacke_utils.h"
00034 
00035 /* Check a matrix for NaN entries. */
00036 
00037 lapack_logical LAPACKE_shs_nancheck( int matrix_order, lapack_int n,
00038                                       const float *a,
00039                                       lapack_int lda )
00040 {
00041     lapack_logical subdiag_nans;
00042 
00043     if( a == NULL ) return (lapack_logical) 0;
00044 
00045     /* Check subdiagonal first */
00046     if( matrix_order == LAPACK_COL_MAJOR ) {
00047         subdiag_nans = LAPACKE_s_nancheck( n-1, &a[1], lda+1 );
00048     } else if ( matrix_order == LAPACK_ROW_MAJOR ) {
00049         subdiag_nans = LAPACKE_s_nancheck( n-1, &a[lda], lda+1 );
00050     } else {
00051         return (lapack_logical) 0;
00052     }
00053 
00054     /* Check upper triangular if subdiagonal has no NaNs. */
00055     return subdiag_nans || LAPACKE_str_nancheck( matrix_order, 'u', 'n',
00056                                                  n, a, lda);
00057 }


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