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//------------------------------------------------------------------------------
// GraphBLAS/Demo/Include/get_matrix.c: get matrix from file, or create random
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Creates a symmetric matrix, either from a file or by creating a random
// matrix. If reading from a file, the file is assumed to be 0-based.
#include "graphblas_demos.h"
#undef FREE_ALL
#define FREE_ALL \
GrB_Matrix_free (&A) ; \
GrB_Descriptor_free (&desc) ; \
GrB_Matrix_free (&Mask) ;
GrB_Info get_matrix // get a matrix from stdin, or create random one
(
GrB_Matrix *A_output, // matrix to create
int argc, // command-line arguments
char **argv,
bool no_self_edges, // if true, ensure the matrix has no self-edges
bool boolean, // if true, file is read as GrB_BOOL, else GrB_FP64
bool spones, // if true, return all entries equal to 1
uint64_t *state // random state, revised on output
)
{
GrB_Info info ;
GrB_Index nrows = 1, ncols = 1, ntuples = 1, nvals ;
GrB_Matrix A = NULL ;
GrB_Matrix Mask = NULL ;
GrB_Descriptor desc = NULL ;
int kind = 0 ;
if (argc > 2)
{
//----------------------------------------------------------------------
// create a random matrix
//----------------------------------------------------------------------
kind = strtol (argv [1], NULL, 0) ;
if (kind == 0)
{
//------------------------------------------------------------------
// random pattern
//------------------------------------------------------------------
// usage: ./main 0 nrows ncols ntuples method
int method = 0 ; // 0:setElement, 1:build
if (argc > 2) nrows = strtol (argv [2], NULL, 0) ;
if (argc > 3) ncols = strtol (argv [3], NULL, 0) ;
if (argc > 4) ntuples = strtol (argv [4], NULL, 0) ;
if (argc > 5) method = strtol (argv [5], NULL, 0) ;
OK (random_matrix (&A, true, no_self_edges,
nrows, ncols, ntuples, method, false, state)) ;
// printf format warnings can vary with different compilers, so
// punt and type cast to double
GrB_Matrix_nvals (&nvals, A) ;
printf ( "random %.16g by %.16g, nz: %.16g, method %d\n",
(double) nrows, (double) ncols, (double) nvals, method) ;
fprintf (stderr, "random %.16g by %.16g, nz: %.16g, method %d\n",
(double) nrows, (double) ncols, (double) nvals, method) ;
}
else
{
//------------------------------------------------------------------
// Wathen matrix
//------------------------------------------------------------------
// usage: ./main 1 nx ny method
int method = 0 ; // 0 to 3
int64_t nx = 4, ny = 4 ;
if (argc > 2) nx = strtol (argv [2], NULL, 0) ;
if (argc > 3) ny = strtol (argv [3], NULL, 0) ;
if (argc > 4) method = strtol (argv [4], NULL, 0) ;
OK (wathen (&A, nx, ny, false, method, NULL, state)) ;
// remove the self edges from the matrix
if (no_self_edges)
{
OK (GrB_Matrix_select_UINT64 (A, NULL, NULL, GrB_OFFDIAG, A,
0, NULL)) ;
}
GrB_Matrix_nrows (&nrows, A) ;
OK (GrB_Matrix_nvals (&nvals, A)) ;
printf ("Wathen: nx %.16g ny %.16g n %.16g nz %.16g method %d\n",
(double) nx, (double) ny, (double) nrows,
(double) nvals, method) ;
fprintf (stderr,
"Wathen: nx %.16g ny %.16g n %.16g nz %.16g method %d\n",
(double) nx, (double) ny, (double) nrows,
(double) nvals, method) ;
}
}
else
{
//----------------------------------------------------------------------
// read a 0-based or 1-based matrix from stdin
//----------------------------------------------------------------------
// usage: ./main < file
// ./main 0 < file
// ./main 1 < file
//
// default is 0-based, for the matrices in the Matrix/ folder
bool one_based = false ;
if (argc > 1) one_based = strtol (argv [1], NULL, 0) ;
OK (read_matrix (&A, stdin, true, no_self_edges, one_based, boolean,
false)) ;
OK (GrB_Matrix_nrows (&nrows, A)) ;
OK (GrB_Matrix_ncols (&ncols, A)) ;
OK (GrB_Matrix_nvals (&nvals, A)) ;
printf ("matrix %.16g by %.16g, %.16g entries, from stdin\n",
(double) nrows, (double) ncols, (double) nvals) ;
fprintf (stderr, "matrix %.16g by %.16g, %.16g entries, from stdin\n",
(double) nrows, (double) ncols, (double) nvals) ;
}
//--------------------------------------------------------------------------
// replace all values with 1 if spones is true
//--------------------------------------------------------------------------
if (spones)
{
// A<A,struct> = 1
OK (GrB_Matrix_assign_BOOL (A, A, NULL, true,
GrB_ALL, nrows, GrB_ALL, ncols, GrB_DESC_S)) ;
}
//--------------------------------------------------------------------------
// print and return result
//--------------------------------------------------------------------------
*A_output = A ;
A = NULL ;
return (GrB_SUCCESS) ;
}
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