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// SuiteSparse/MATLAB_Tools/spok/spok.c
// SPOK, Copyright (c) 2008-2011, Timothy A Davis. All Rights Reserved.
// SPDX-License-Identifier: BSD-3-clause
#include "spok.h"
/* check the validity of a MATLAB sparse matrix */
SPOK_INT spok
(
/* inputs, not modified */
SPOK_INT m, /* number of rows */
SPOK_INT n, /* number of columns */
SPOK_INT nzmax, /* max # of entries */
SPOK_INT *Ap, /* size n+1, column pointers */
SPOK_INT *Ai, /* size nz = Ap [n], row indices */
double *Ax, /* double matrices always have Ax */
double *Az, /* imaginary matrices always have Az */
char *As, /* logical matrices always have As */
/* outputs, not defined on input */
SPOK_INT *p_njumbled, /* # of jumbled row indices (-1 if not computed) */
SPOK_INT *p_nzeros /* number of explicit zeros (-1 if not computed) */
)
{
double x, z ;
SPOK_INT i, j, p, pend, njumbled, nzeros, ilast ;
char s ;
/* ---------------------------------------------------------------------- */
/* in case of early return */
/* ---------------------------------------------------------------------- */
if (p_njumbled != NULL)
{
*p_njumbled = -1 ;
}
if (p_nzeros != NULL)
{
*p_nzeros = -1 ;
}
/* ---------------------------------------------------------------------- */
/* check the dimensions */
/* ---------------------------------------------------------------------- */
if (m < 0)
{
return (SPOK_FATAL_M) ;
}
if (n < 0)
{
return (SPOK_FATAL_N) ;
}
if (nzmax < 1)
{
/* note that nzmax cannot be zero */
return (SPOK_FATAL_NZMAX) ;
}
/* ---------------------------------------------------------------------- */
/* check the column pointers */
/* ---------------------------------------------------------------------- */
if (Ap == NULL || Ap [0] != 0)
{
/* column pointers invalid */
return (SPOK_FATAL_P) ;
}
for (j = 0 ; j < n ; j++)
{
p = Ap [j] ;
pend = Ap [j+1] ;
if (pend < p || pend > nzmax)
{
/* column pointers not monotonically non-decreasing */
return (SPOK_FATAL_P) ;
}
}
/* ---------------------------------------------------------------------- */
/* check the row indices and numerical values */
/* ---------------------------------------------------------------------- */
if (Ai == NULL)
{
/* row indices not present */
return (SPOK_FATAL_I) ;
}
njumbled = 0 ;
nzeros = 0 ;
for (j = 0 ; j < n ; j++)
{
ilast = -1 ;
for (p = Ap [j] ; p < Ap [j+1] ; p++)
{
i = Ai [p] ;
if (i < 0 || i >= m)
{
/* row indices out of range */
return (SPOK_FATAL_I) ;
}
if (i <= ilast)
{
/* row indices unsorted, or duplicates present */
njumbled++ ;
}
s = (As == NULL) ? 0 : As [p] ;
x = (Ax == NULL) ? 0 : Ax [p] ;
z = (Az == NULL) ? 0 : Az [p] ;
if (s == 0 && x == 0 && z == 0)
{
/* an explicit zero is present */
nzeros++ ;
}
ilast = i ;
}
}
/* ---------------------------------------------------------------------- */
/* return results */
/* ---------------------------------------------------------------------- */
if (p_njumbled != NULL)
{
*p_njumbled = njumbled ;
}
if (p_nzeros != NULL)
{
*p_nzeros = nzeros ;
}
return ((njumbled > 0 || nzeros > 0) ? SPOK_WARNING : SPOK_OK) ;
}
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