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//------------------------------------------------------------------------------
// gbnvals: number of entries in a GraphBLAS matrix struct
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// The input may be either a GraphBLAS matrix struct or a standard built-in
// sparse matrix.
// Usage
// nvals = gbnvals (X)
#include "gb_interface.h"
#define USAGE "usage: nvals = gbnvals (X)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin == 1 && nargout <= 1, USAGE) ;
//--------------------------------------------------------------------------
// get a shallow copy of the matrix
//--------------------------------------------------------------------------
GrB_Matrix X = gb_get_shallow (pargin [0]) ;
//--------------------------------------------------------------------------
// get the # of entries in the matrix
//--------------------------------------------------------------------------
GrB_Index nvals ;
OK (GrB_Matrix_nvals (&nvals, X)) ;
//--------------------------------------------------------------------------
// free the shallow copy and return the result
//--------------------------------------------------------------------------
double anvals ;
if (nvals == INT64_MAX)
{
GrB_Index nrows, ncols ;
OK (GrB_Matrix_nrows (&nrows, X)) ;
OK (GrB_Matrix_ncols (&ncols, X)) ;
anvals = ((double) nrows) * ((double) ncols) ;
}
else
{
anvals = (double) nvals ;
}
pargout [0] = mxCreateDoubleScalar (anvals) ;
OK (GrB_Matrix_free (&X)) ;
GB_WRAPUP ;
}
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