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//------------------------------------------------------------------------------
// GB_mex_edit: add/remove entries from a matrix
//------------------------------------------------------------------------------
// 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_edit (C, I, J, X, Action)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&C) ; \
GB_mx_put_global (true) ; \
}
#define OK(method) \
{ \
info = method ; \
if (info != GrB_SUCCESS) \
{ \
mexErrMsgTxt ("fail") ; \
} \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
GrB_Matrix C = NULL ;
GrB_Index *I = NULL, ni = 0, I_range [3] ;
GrB_Index *J = NULL, nj = 0, J_range [3] ;
bool ignore ;
bool malloc_debug = false ;
GrB_Info info = GrB_SUCCESS ;
int64_t nwork = 0 ;
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
malloc_debug = GB_mx_get_global (true) ;
C = NULL ;
// check inputs
if (nargout > 1 || nargin != 5)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
//--------------------------------------------------------------------------
// get C (make a deep copy)
//--------------------------------------------------------------------------
C = GB_mx_mxArray_to_Matrix (pargin [0], "C input", true, true) ;
if (C == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("C failed") ;
}
GrB_Index ncols ;
GxB_Format_Value fmt ;
bool is_hyper ;
OK (GrB_Matrix_ncols (&ncols, C)) ;
OK (GxB_Matrix_Option_get (C, GxB_FORMAT, &fmt)) ;
OK (GxB_Matrix_Option_get (C, GxB_IS_HYPER, &is_hyper)) ; // historical
bool is_vector = (fmt == GxB_BY_COL && !is_hyper && ncols == 1) ;
// get I
if (!GB_mx_mxArray_to_indices (&I, pargin [1], &ni, I_range, &ignore))
{
FREE_ALL ;
mexErrMsgTxt ("I failed") ;
}
// get J
if (!GB_mx_mxArray_to_indices (&J, pargin [2], &nj, J_range, &ignore))
{
FREE_ALL ;
mexErrMsgTxt ("J failed") ;
}
// get X; must be double
double *X = mxGetDoubles (pargin [3]) ;
// get Action: must be double
double *Action = mxGetDoubles (pargin [4]) ;
nwork = ni ;
if (nwork != nj ||
nwork != mxGetNumberOfElements (pargin [3]) ||
nwork != mxGetNumberOfElements (pargin [4]) ||
mxGetClassID (pargin [3]) != mxDOUBLE_CLASS ||
mxGetClassID (pargin [4]) != mxDOUBLE_CLASS)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
//--------------------------------------------------------------------------
// turn off malloc debugging
//--------------------------------------------------------------------------
bool save = GB_Global_malloc_debug_get ( ) ;
GB_Global_malloc_debug_set (false) ;
GrB_Scalar Scalar = NULL ;
OK (GrB_Scalar_new (&Scalar, GrB_FP64)) ; // create an empty scalar
//--------------------------------------------------------------------------
// edit the matrix
//--------------------------------------------------------------------------
for (int64_t k = 0 ; k < nwork ; k++)
{
int64_t i = I [k] - 1 ;
int64_t j = J [k] - 1 ;
double x = X [k] ;
double action = Action [k] ;
if (action <= 0.2)
{
// remove the (i,j) entry
if (is_vector)
{
OK (GrB_Vector_removeElement ((GrB_Vector) C, i)) ;
}
else
{
OK (GrB_Matrix_removeElement (C, i, j)) ;
}
}
else if (action <= 0.4)
{
// remove the (i,j) entry using setElement_Scalar
if (is_vector)
{
OK (GrB_Vector_setElement_Scalar ((GrB_Vector) C, Scalar, i)) ;
}
else
{
OK (GrB_Matrix_setElement_Scalar (C, Scalar, i, j)) ;
}
}
else
{
// add the (i,j) entry
if (is_vector)
{
OK (GrB_Vector_setElement_FP64_ ((GrB_Vector) C, x, i)) ;
}
else
{
OK (GrB_Matrix_setElement_FP64_ (C, x, i, j)) ;
}
}
}
//--------------------------------------------------------------------------
// restore malloc debugging to test the method
//--------------------------------------------------------------------------
OK (GrB_Scalar_free (&Scalar)) ;
GB_Global_malloc_debug_set (save) ;
//--------------------------------------------------------------------------
// return C as a built-in sparse matrix
//--------------------------------------------------------------------------
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C mex_edit result", false) ;
FREE_ALL ;
}
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