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//------------------------------------------------------------------------------
// GB_mex_reshape: reshape a matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_mex.h"
#define USAGE "C = GB_mex_reshape (A, nrows_new, ncols_new, by_col, in_place)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
GrB_Matrix_free_(&C) ; \
GB_mx_put_global (true) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix C = NULL, A = NULL ;
// check inputs
if (nargout > 1 || nargin != 5)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define FREE_DEEP_COPY GrB_Matrix_free_(&C) ;
uint64_t nrows_new = (uint64_t) mxGetScalar (pargin [1]) ;
uint64_t ncols_new = (uint64_t) mxGetScalar (pargin [2]) ;
bool by_col = (bool ) mxGetScalar (pargin [3]) ;
bool in_place = (bool ) mxGetScalar (pargin [4]) ;
// reshape the matrix
if (in_place)
{
// in-place reshape of C
#define GET_DEEP_COPY \
C = GB_mx_mxArray_to_Matrix (pargin [0], "C input", true, true) ;
GET_DEEP_COPY ;
if (C == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("C failed") ;
}
METHOD (GxB_Matrix_reshape (C, by_col, nrows_new, ncols_new, NULL)) ;
}
else
{
// C is a new matrix created from the input matrix A
#undef GET_DEEP_COPY
#define GET_DEEP_COPY ;
A = GB_mx_mxArray_to_Matrix (pargin [0], "A", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
METHOD (GxB_Matrix_reshapeDup (&C, A, by_col, nrows_new, ncols_new,
NULL)) ;
}
// return C as a struct and free the GraphBLAS C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C output", true) ;
FREE_ALL ;
}
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