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//------------------------------------------------------------------------------
// GB_mex_split: C = split (Tiles)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_mex.h"
#define USAGE "C = GB_mex_split (A, ms, ns)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
mxFree (Tiles) ; \
GB_mx_put_global (true) ; \
}
#define OK(method) \
{ \
info = method ; \
if (info != GrB_SUCCESS) \
{ \
printf ("%d at %d\n", info, __LINE__) ; \
mexErrMsgTxt ("failed") ; \
} \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
GrB_Info info ;
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL ;
GrB_Matrix *Tiles = NULL ;
// check inputs
if (nargout > 1 || nargin != 3)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [0], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get ms (deep copy)
if (mxGetClassID (pargin [1]) != mxDOUBLE_CLASS)
{
mexErrMsgTxt ("ms must be double") ;
}
double *ms_double = mxGetDoubles (pargin [1]) ;
GrB_Index m = mxGetNumberOfElements (pargin [1]) ;
GrB_Index *Tile_nrows = mxMalloc (m * sizeof (GrB_Index)) ;
for (int64_t k = 0 ; k < m ; k++)
{
Tile_nrows [k] = (GrB_Index) (ms_double [k]) ;
}
// get ns (deep copy)
if (mxGetClassID (pargin [2]) != mxDOUBLE_CLASS)
{
mexErrMsgTxt ("ns must be double") ;
}
double *ns_double = mxGetDoubles (pargin [2]) ;
GrB_Index n = mxGetNumberOfElements (pargin [2]) ;
GrB_Index *Tile_ncols = mxMalloc (n * sizeof (GrB_Index)) ;
for (int64_t k = 0 ; k < n ; k++)
{
Tile_ncols [k] = (GrB_Index) (ns_double [k]) ;
}
// create Tiles
Tiles = mxCalloc (m * n, sizeof (GrB_Matrix)) ;
// construct the empty Tiles array
#define GET_DEEP_COPY \
memset (Tiles, 0, m * n * sizeof (GrB_Matrix)) ;
#define FREE_DEEP_COPY \
for (int64_t k = 0 ; k < m*n ; k++) \
{ \
GrB_Matrix_free (&(Tiles [k])) ; \
}
// Tiles = split (A, ms, ns)
METHOD (GxB_Matrix_split (Tiles, m, n, Tile_nrows, Tile_ncols, A, NULL)) ;
// return C as a cell array and free the GraphBLAS tiles
pargout [0] = mxCreateCellMatrix (m, n) ;
for (int64_t j = 0 ; j < n ; j++)
{
for (int64_t i = 0 ; i < m ; i++)
{
mxArray *T = GB_mx_Matrix_to_mxArray (&(Tiles [i*n+j]),
"Tile output", true) ;
mxSetCell (pargout [0], i+j*m, T) ;
}
}
FREE_ALL ;
}
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