LAPACK 3.11.0
LAPACK: Linear Algebra PACKage
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lapacke_dtp_nancheck.c
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1/*****************************************************************************
2 Copyright (c) 2014, Intel Corp.
3 All rights reserved.
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6 modification, are permitted provided that the following conditions are met:
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11 notice, this list of conditions and the following disclaimer in the
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28******************************************************************************
29* Contents: Native C interface to LAPACK utility function
30* Author: Intel Corporation
31*****************************************************************************/
32#include "lapacke_utils.h"
33
34/* Check a matrix for NaN entries.
35 * Since matrix in packed format stored continuously it just required to
36 * check 1d array for NaNs. It doesn't depend upon uplo or matrix_layout.
37 */
38
39lapack_logical LAPACKE_dtp_nancheck( int matrix_layout, char uplo, char diag,
40 lapack_int n,
41 const double *ap )
42{
43 lapack_int i, len;
44 lapack_logical colmaj, upper, unit;
45
46 if( ap == NULL ) return (lapack_logical) 0;
47
48 colmaj = ( matrix_layout == LAPACK_COL_MAJOR );
49 upper = LAPACKE_lsame( uplo, 'u' );
50 unit = LAPACKE_lsame( diag, 'u' );
51
52 if( ( !colmaj && ( matrix_layout != LAPACK_ROW_MAJOR ) ) ||
53 ( !upper && !LAPACKE_lsame( uplo, 'l' ) ) ||
54 ( !unit && !LAPACKE_lsame( diag, 'n' ) ) ) {
55 /* Just exit if any of input parameters are wrong */
56 return (lapack_logical) 0;
57 }
58
59 if( unit ) {
60 /* Unit case, diagonal should be excluded from the check for NaN. */
61
62 /* Since col_major upper and row_major lower are equal,
63 * and col_major lower and row_major upper are equals too -
64 * using one code for equal cases. XOR( colmaj, upper )
65 */
66 if( ( colmaj || upper ) && !( colmaj && upper ) ) {
67 for( i = 1; i < n; i++ )
68 if( LAPACKE_d_nancheck( i, &ap[ ((size_t)i+1)*i/2 ], 1 ) )
69 return (lapack_logical) 1;
70 } else {
71 for( i = 0; i < n-1; i++ )
72 if( LAPACKE_d_nancheck( n-i-1,
73 &ap[ (size_t)i+1 + i*((size_t)2*n-i+1)/2 ], 1 ) )
74 return (lapack_logical) 1;
75 }
76 return (lapack_logical) 0;
77 } else {
78 /* Non-unit case - just check whole array for NaNs. */
79 len = n*(n+1)/2;
80 return LAPACKE_d_nancheck( len, ap, 1 );
81 }
82}
#define lapack_int
Definition: lapack.h:87
#define lapack_logical
Definition: lapack.h:103
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
lapack_logical LAPACKE_dtp_nancheck(int matrix_layout, char uplo, char diag, lapack_int n, const double *ap)
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
lapack_logical LAPACKE_d_nancheck(lapack_int n, const double *x, lapack_int incx)