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//------------------------------------------------------------------------------
// gb_export_to_mxsparse: export a GrB_Matrix to a built-in sparse matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// The input GrB_Matrix A is exported to a built-in sparse mxArray S, and freed.
// The input GrB_Matrix A may be shallow or deep. The output is a standard
// built-in sparse matrix as an mxArray.
#include "gb_interface.h"
mxArray *gb_export_to_mxsparse // return exported built-in sparse matrix S
(
GrB_Matrix *A_handle // matrix to export; freed on output
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
CHECK_ERROR (A_handle == NULL || (*A_handle) == NULL, "internal error 2") ;
//--------------------------------------------------------------------------
// typecast to a native built-in sparse type and free A
//--------------------------------------------------------------------------
GrB_Matrix T ; // T will always be deep
GrB_Type type ;
OK (GxB_Matrix_type (&type, *A_handle)) ;
GxB_Format_Value fmt ;
OK (GxB_Matrix_Option_get (*A_handle, GxB_FORMAT, &fmt)) ;
if (fmt == GxB_BY_COL &&
(type == GrB_BOOL || type == GrB_FP64 || type == GxB_FC64))
{
//----------------------------------------------------------------------
// A is already in a native built-in sparse matrix type, by column
//----------------------------------------------------------------------
if (GB_is_shallow (*A_handle))
{
// A is shallow so make a deep copy
OK (GrB_Matrix_dup (&T, *A_handle)) ;
OK (GrB_Matrix_free (A_handle)) ;
}
else
{
// A is already deep; just transplant it into T
T = (*A_handle) ;
(*A_handle) = NULL ;
}
}
else
{
//----------------------------------------------------------------------
// typecast A to logical, double or double complex, and format by column
//----------------------------------------------------------------------
// Built-in sparse matrices can only be logical, double, or double
// complex. These correspond to GrB_BOOL, GrB_FP64, and GxB_FC64,
// respectively. A is typecasted to logical, double or double complex,
// and converted to CSC format if not already in that format.
if (type == GxB_FC32 || type == GxB_FC64)
{
// typecast to double complex, by col
type = GxB_FC64 ;
}
else if (type == GrB_BOOL)
{
// typecast to logical, by col
type = GrB_BOOL ;
}
else
{
// typecast to double, by col
type = GrB_FP64 ;
}
T = gb_typecast (*A_handle, type, GxB_BY_COL, GxB_SPARSE) ;
OK (GrB_Matrix_free (A_handle)) ;
}
// ensure T is deep
CHECK_ERROR (GB_is_shallow (T), "internal error 7") ;
//--------------------------------------------------------------------------
// drop zeros from T
//--------------------------------------------------------------------------
OK1 (T, GxB_Matrix_select (T, NULL, NULL, GxB_NONZERO, T, NULL, NULL)) ;
//--------------------------------------------------------------------------
// create the new built-in sparse matrix
//--------------------------------------------------------------------------
GrB_Index nrows, ncols, nvals ;
OK (GrB_Matrix_nvals (&nvals, T)) ;
OK (GrB_Matrix_nrows (&nrows, T)) ;
OK (GrB_Matrix_ncols (&ncols, T)) ;
mxArray *S ;
if (nvals == 0)
{
//----------------------------------------------------------------------
// allocate an empty sparse matrix of the right type and size
//----------------------------------------------------------------------
if (type == GrB_BOOL)
{
S = mxCreateSparseLogicalMatrix (nrows, ncols, 1) ;
}
else if (type == GxB_FC64)
{
S = mxCreateSparse (nrows, ncols, 1, mxCOMPLEX) ;
}
else
{
S = mxCreateSparse (nrows, ncols, 1, mxREAL) ;
}
OK (GrB_Matrix_free (&T)) ;
}
else
{
//----------------------------------------------------------------------
// export the content of T as a sparse CSC matrix
//----------------------------------------------------------------------
GrB_Index Tp_size, Ti_size, Tx_size, type_size ;
uint64_t *Tp, *Ti ;
void *Tx ;
// pass jumbled as NULL to indicate the matrix must be sorted
// pass iso as NULL to indicate it cannot be uniform valued
OK (GxB_Matrix_export_CSC (&T, &type, &nrows, &ncols,
&Tp, &Ti, &Tx, &Tp_size, &Ti_size, &Tx_size, NULL, NULL, NULL)) ;
CHECK_ERROR (Ti_size == 0, "internal error 8") ;
CHECK_ERROR (Tp == NULL || Ti == NULL || Tx == NULL,
"internal error 9") ;
//----------------------------------------------------------------------
// allocate an empty sparse matrix of the right type, then set content
//----------------------------------------------------------------------
if (type == GrB_BOOL)
{
S = mxCreateSparseLogicalMatrix (0, 0, 1) ;
type_size = 1 ;
}
else if (type == GxB_FC64)
{
S = mxCreateSparse (0, 0, 1, mxCOMPLEX) ;
type_size = 16 ;
}
else // type == GrB_FP64
{
S = mxCreateSparse (0, 0, 1, mxREAL) ;
type_size = 8 ;
}
// set the size
mxSetM (S, nrows) ;
mxSetN (S, ncols) ;
int64_t nzmax = GB_IMIN (Ti_size / sizeof (int64_t),
Tx_size / type_size) ;
mxSetNzmax (S, nzmax) ;
// set the column pointers
void *p = mxGetJc (S) ; gb_mxfree (&p) ;
mxSetJc (S, (mwIndex *) Tp) ;
// set the row indices
p = mxGetIr (S) ; gb_mxfree (&p) ;
mxSetIr (S, (mwIndex *) Ti) ;
// set the values
// use mxGetData and mxSetData (best for Octave, fine for MATLAB)
p = mxGetData (S) ; gb_mxfree (&p) ;
mxSetData (S, Tx) ;
}
//--------------------------------------------------------------------------
// return the new built-in sparse matrix
//--------------------------------------------------------------------------
return (S) ;
}
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