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//------------------------------------------------------------------------------
// GB_mex_complex: convert a real matrix into a complex one
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// If A is real, C has an all-zero imaginary part.
// If A is complex, then C = A.
// This is a sparse version of the built-in 'complex' function, which does not
// work for sparse matrices. This is self-contained and does not use GraphBLAS
// at all.
#include "mex.h"
#include "matrix.h"
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define USAGE "C = GB_mex_complex (A)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
// check inputs
if (nargout > 1 || nargin != 1)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get the input matrix
const mxArray *A = pargin [0] ;
bool A_is_sparse = mxIsSparse (A) ;
if (mxIsLogical (A))
{
mexErrMsgTxt ("A must be double or double complex") ;
}
int64_t *Ap, *Ai ;
if (A_is_sparse)
{
Ap = (int64_t *) mxGetJc (A) ;
Ai = (int64_t *) mxGetIr (A) ;
}
else
{
Ap = NULL ;
Ai = NULL ;
}
double *Ax = NULL ;
if (mxIsComplex (A))
{
Ax = (double *) mxGetComplexDoubles (pargin [0]) ;
}
else
{
Ax = (double *) mxGetDoubles (pargin [0]) ;
}
int64_t m = mxGetM (A) ;
int64_t n = mxGetN (A) ;
int64_t anz = (A_is_sparse) ? Ap [n] : (m*n) ;
// create the output matrix
if (A_is_sparse)
{
// A and C are sparse
pargout [0] = mxCreateSparse (m, n, anz+1, mxCOMPLEX) ;
int64_t *Cp = (int64_t *) mxGetJc (pargout [0]) ;
int64_t *Ci = (int64_t *) mxGetIr (pargout [0]) ;
// copy the pattern of A into C
memcpy (Cp, Ap, (n+1) * sizeof (int64_t)) ;
memcpy (Ci, Ai, anz * sizeof (int64_t)) ;
}
else
{
// A and C are full
pargout [0] = mxCreateDoubleMatrix (m, n, mxCOMPLEX) ;
}
// copy the values of A into C
double *Cx = (double *) mxGetComplexDoubles (pargout [0]) ;
if (mxIsComplex (A))
{
memcpy (Cx, Ax, anz * 2 * sizeof (double)) ;
}
else
{
for (int64_t k = 0 ; k < anz ; k++)
{
Cx [2*k ] = Ax [k] ;
Cx [2*k+1] = 0 ;
}
}
}
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