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//------------------------------------------------------------------------------
// GB_mex_vdiag: compute v=diag(A,k)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// v = diag (A,k,vtype)
#include "GB_mex.h"
#define USAGE "v = GB_mex_vdiag (A,k,vtype)"
#define FREE_ALL \
{ \
GrB_Vector_free_(&V) ; \
GrB_Matrix_free_(&A) ; \
GB_mx_put_global (true) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL ;
GrB_Vector V = NULL ;
// check inputs
if (nargout > 1 || nargin < 1 || nargin > 3)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// get A
A = GB_mx_mxArray_to_Matrix (pargin [0], "A", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get k
int64_t k = 0 ;
if (nargin > 1)
{
k = (int64_t) mxGetScalar (pargin [1]) ;
}
// get the type
GrB_Type vtype ;
GxB_Matrix_type (&vtype, A) ;
vtype = GB_mx_string_to_Type (PARGIN (2), vtype) ;
// construct V
int64_t n, nrows, ncols ;
GrB_Matrix_nrows ((uint64_t *) &nrows, A) ;
GrB_Matrix_ncols ((uint64_t *) &ncols, A) ;
if (k >= ncols || k <= -nrows)
{
// output vector V must have zero length
n = 0 ;
}
else if (k >= 0)
{
// if k is in range 0 to n-1, V must have length min (m,n-k)
n = GB_IMIN (nrows, ncols - k) ;
}
else
{
// if k is in range -1 to -m+1, V must have length min (m+k,n)
n = GB_IMIN (nrows + k, ncols) ;
}
#undef GET_DEEP_COPY
#undef FREE_DEEP_COPY
#define GET_DEEP_COPY GrB_Vector_new (&V, vtype, n) ;
#define FREE_DEEP_COPY GrB_Vector_free_(&V) ;
GET_DEEP_COPY ;
// V = diag (A,k)
METHOD (GxB_Vector_diag (V, A, k, NULL)) ;
// return V as a struct
pargout [0] = GB_mx_Matrix_to_mxArray ((GrB_Matrix *) &V, "V=diag(A,k)",
true) ;
FREE_ALL ;
}
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