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//------------------------------------------------------------------------------
// gbextracttuples: extract all entries from a GraphBLAS matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Usage:
// [I J X] = GrB.extracttuples (A)
// [I J X] = GrB.extracttuples (A, desc)
// The desciptor is optional. If present, it must be a struct.
// desc.base = 'zero-based': I and J are returned as 0-based int64 indices
// desc.base = 'one-based int': I and J are returned as 1-based int64 indices
// desc.base = 'one-based': I and J are returned as 1-based double indices
// desc.base = 'default': 'one-based', unless max(size(A)) > flintmax,
// in which case 'one-based int' is used.
#include "gb_interface.h"
#define USAGE "usage: [I,J,X] = GrB.extracttuples (A, desc)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin >= 1 && nargin <= 2 && nargout <= 3, USAGE) ;
//--------------------------------------------------------------------------
// get the optional descriptor
//--------------------------------------------------------------------------
base_enum_t base = BASE_DEFAULT ;
kind_enum_t kind = KIND_FULL ; // ignored
GxB_Format_Value fmt = GxB_NO_FORMAT ; // ignored
int sparsity = 0 ; // ignored
GrB_Descriptor desc = NULL ;
if (nargin > 1)
{
desc = gb_mxarray_to_descriptor (pargin [nargin-1], &kind, &fmt,
&sparsity, &base) ;
}
OK (GrB_Descriptor_free (&desc)) ;
//--------------------------------------------------------------------------
// get the matrix
//--------------------------------------------------------------------------
GrB_Matrix A = gb_get_shallow (pargin [0]) ;
GrB_Index nvals ;
OK (GrB_Matrix_nvals (&nvals, A)) ;
GrB_Type xtype ;
OK (GxB_Matrix_type (&xtype, A)) ;
//--------------------------------------------------------------------------
// determine what to extract
//--------------------------------------------------------------------------
bool extract_I = true ;
bool extract_J = (nargout > 1) ;
bool extract_X = (nargout > 2) ;
//--------------------------------------------------------------------------
// allocate I and J
//--------------------------------------------------------------------------
GrB_Index s = MAX (nvals, 1) ;
GrB_Index *I = extract_I ? mxMalloc (s * sizeof (GrB_Index)) : NULL ;
GrB_Index *J = extract_J ? mxMalloc (s * sizeof (GrB_Index)) : NULL ;
//--------------------------------------------------------------------------
// extract the tuples and export X
//--------------------------------------------------------------------------
if (xtype == GrB_BOOL)
{
bool *X = extract_X ? mxMalloc (s * sizeof (bool)) : NULL ;
OK (GrB_Matrix_extractTuples_BOOL (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_BOOL) ;
}
}
else if (xtype == GrB_INT8)
{
int8_t *X = extract_X ? mxMalloc (s * sizeof (int8_t)) : NULL ;
OK (GrB_Matrix_extractTuples_INT8 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_INT8) ;
}
}
else if (xtype == GrB_INT16)
{
int16_t *X = extract_X ? mxMalloc (s * sizeof (int16_t)) : NULL ;
OK (GrB_Matrix_extractTuples_INT16 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_INT16) ;
}
}
else if (xtype == GrB_INT32)
{
int32_t *X = extract_X ? mxMalloc (s * sizeof (int32_t)) : NULL ;
OK (GrB_Matrix_extractTuples_INT32 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_INT32) ;
}
}
else if (xtype == GrB_INT64)
{
int64_t *X = extract_X ? mxMalloc (s * sizeof (int64_t)) : NULL ;
OK (GrB_Matrix_extractTuples_INT64 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_INT64) ;
}
}
else if (xtype == GrB_UINT8)
{
uint8_t *X = extract_X ? mxMalloc (s * sizeof (uint8_t)) : NULL ;
OK (GrB_Matrix_extractTuples_UINT8 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_UINT8) ;
}
}
else if (xtype == GrB_UINT16)
{
uint16_t *X = extract_X ? mxMalloc (s * sizeof (uint16_t)) : NULL ;
OK (GrB_Matrix_extractTuples_UINT16 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_UINT16) ;
}
}
else if (xtype == GrB_UINT32)
{
uint32_t *X = extract_X ? mxMalloc (s * sizeof (uint32_t)) : NULL ;
OK (GrB_Matrix_extractTuples_UINT32 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_UINT32) ;
}
}
else if (xtype == GrB_UINT64)
{
uint64_t *X = extract_X ? mxMalloc (s * sizeof (uint64_t)) : NULL ;
OK (GrB_Matrix_extractTuples_UINT64 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_UINT64) ;
}
}
else if (xtype == GrB_FP32)
{
float *X = extract_X ? mxMalloc (s * sizeof (float)) : NULL ;
OK (GrB_Matrix_extractTuples_FP32 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_FP32) ;
}
}
else if (xtype == GrB_FP64)
{
double *X = extract_X ? mxMalloc (s * sizeof (double)) : NULL ;
OK (GrB_Matrix_extractTuples_FP64 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GrB_FP64) ;
}
}
else if (xtype == GxB_FC32)
{
GxB_FC32_t *X = extract_X ? mxMalloc (s * sizeof (GxB_FC32_t)) : NULL ;
OK (GxB_Matrix_extractTuples_FC32 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GxB_FC32) ;
}
}
else if (xtype == GxB_FC64)
{
GxB_FC64_t *X = extract_X ? mxMalloc (s * sizeof (GxB_FC64_t)) : NULL ;
OK (GxB_Matrix_extractTuples_FC64 (I, J, X, &nvals, A)) ;
if (extract_X)
{
pargout [2] = gb_export_to_mxfull ((void **) (&X), nvals, 1,
GxB_FC64) ;
}
}
else
{
ERROR ("unsupported type") ;
}
//--------------------------------------------------------------------------
// determine if zero-based or one-based
//--------------------------------------------------------------------------
if (base == BASE_DEFAULT)
{
GrB_Index nrows, ncols ;
OK (GrB_Matrix_nrows (&nrows, A)) ;
OK (GrB_Matrix_ncols (&ncols, A)) ;
if (MAX (nrows, ncols) > FLINTMAX)
{
// the matrix is too large for I and J to be returned as double
base = BASE_1_INT64 ;
}
else
{
// this is the typical case
base = BASE_1_DOUBLE ;
}
}
//--------------------------------------------------------------------------
// free workspace
//--------------------------------------------------------------------------
OK (GrB_Matrix_free (&A)) ;
//--------------------------------------------------------------------------
// export I and J
//--------------------------------------------------------------------------
if (base == BASE_0_INT64)
{
//----------------------------------------------------------------------
// export I and J in their native zero-based integer format
//----------------------------------------------------------------------
if (extract_I)
{
pargout [0] = gb_export_to_mxfull ((void **) (&I), nvals, 1,
GrB_INT64) ;
}
if (extract_J)
{
pargout [1] = gb_export_to_mxfull ((void **) (&J), nvals, 1,
GrB_INT64) ;
}
}
else if (base == BASE_1_DOUBLE)
{
//----------------------------------------------------------------------
// export I and J as double one-based integers
//----------------------------------------------------------------------
if (extract_I)
{
double *I_double = mxMalloc (s * sizeof (double)) ;
GB_helper1 (I_double, I, (int64_t) nvals) ;
gb_mxfree ((void **) (&I)) ;
pargout [0] = gb_export_to_mxfull ((void **) (&I_double), nvals, 1,
GrB_FP64) ;
}
if (extract_J)
{
double *J_double = mxMalloc (s * sizeof (double)) ;
GB_helper1 (J_double, J, (int64_t) nvals) ;
gb_mxfree ((void **) (&J)) ;
pargout [1] = gb_export_to_mxfull ((void **) (&J_double), nvals, 1,
GrB_FP64) ;
}
}
else if (base == BASE_1_INT64)
{
//----------------------------------------------------------------------
// export I and J as int64 one-based integers
//----------------------------------------------------------------------
if (extract_I)
{
GB_helper1i ((int64_t *) I, (int64_t) nvals) ;
pargout [0] = gb_export_to_mxfull ((void **) (&I), nvals, 1,
GrB_INT64) ;
}
if (extract_J)
{
GB_helper1i ((int64_t *) J, (int64_t) nvals) ;
pargout [1] = gb_export_to_mxfull ((void **) (&J), nvals, 1,
GrB_INT64) ;
}
}
GB_WRAPUP ;
}
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