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//------------------------------------------------------------------------------
// gbcat: matrix concatenation
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// gbcat is an interface to GxB_Matrix_concat.
// Usage:
// C = gbcat (Tiles, desc)
// where Tiles is a 2D cell array of matrices.
#include "gb_interface.h"
#define USAGE "usage: C = GrB.cat (Tiles, desc)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin >= 1 && nargin <= 2 && nargout <= 2, USAGE) ;
//--------------------------------------------------------------------------
// find the arguments
//--------------------------------------------------------------------------
mxArray *Matrix [6], *String [2], *Cell [2] ;
base_enum_t base ;
kind_enum_t kind ;
GxB_Format_Value fmt ;
int nmatrices, nstrings, ncells, sparsity ;
GrB_Descriptor desc ;
gb_get_mxargs (nargin, pargin, USAGE, Matrix, &nmatrices, String, &nstrings,
Cell, &ncells, &desc, &base, &kind, &fmt, &sparsity) ;
CHECK_ERROR (nmatrices > 0 || nstrings > 0 || ncells != 1, USAGE) ;
//--------------------------------------------------------------------------
// get the tiles
//--------------------------------------------------------------------------
mxArray *mxTiles = Cell [0] ;
int64_t m = mxGetM (mxTiles) ;
int64_t n = mxGetN (mxTiles) ;
GrB_Matrix *Tiles = mxMalloc (m * n * sizeof (GrB_Matrix)) ;
for (int64_t j = 0 ; j < n ; j++)
{
for (int64_t i = 0 ; i < m ; i++)
{
// get the Tiles {i,j} matrix.
// Tiles is row-major but mxTiles is column-major
Tiles [i*n+j] = gb_get_shallow (mxGetCell (mxTiles, i+j*m)) ;
}
}
//--------------------------------------------------------------------------
// determine the # of rows of C from Tiles {:,0}
//--------------------------------------------------------------------------
GrB_Index cnrows = 0 ;
for (int64_t i = 0 ; i < m ; i++)
{
GrB_Index anrows ;
OK (GrB_Matrix_nrows (&anrows, Tiles [i*n])) ;
cnrows += anrows ;
}
//--------------------------------------------------------------------------
// determine the # of columms of C from Tiles {0,:}
//--------------------------------------------------------------------------
GrB_Index cncols = 0 ;
for (int64_t j = 0 ; j < n ; j++)
{
GrB_Index ancols ;
OK (GrB_Matrix_ncols (&ancols, Tiles [j])) ;
cncols += ancols ;
}
//--------------------------------------------------------------------------
// determine the type of C
//--------------------------------------------------------------------------
GrB_Type ctype ;
OK (GxB_Matrix_type (&ctype, Tiles [0])) ;
for (int64_t k = 1 ; k < m*n ; k++)
{
GrB_Type atype ;
OK (GxB_Matrix_type (&atype, Tiles [k])) ;
ctype = gb_default_type (ctype, atype) ;
}
//--------------------------------------------------------------------------
// create the matrix C and set its format and sparsity
//--------------------------------------------------------------------------
fmt = gb_get_format (cnrows, cncols, NULL, NULL, fmt) ;
GrB_Matrix C = gb_new (ctype, cnrows, cncols, fmt, sparsity) ;
//--------------------------------------------------------------------------
// C = concatenate (Tiles)
//--------------------------------------------------------------------------
OK1 (C, GxB_Matrix_concat (C, Tiles, m, n, desc)) ;
//--------------------------------------------------------------------------
// free shallow copies
//--------------------------------------------------------------------------
for (int64_t k = 0 ; k < m*n ; k++)
{
OK (GrB_Matrix_free (&(Tiles [k]))) ;
}
OK (GrB_Descriptor_free (&desc)) ;
mxFree (Tiles) ;
//--------------------------------------------------------------------------
// export the output matrix C
//--------------------------------------------------------------------------
pargout [0] = gb_export (&C, kind) ;
pargout [1] = mxCreateDoubleScalar (kind) ;
GB_WRAPUP ;
}
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