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//------------------------------------------------------------------------------
// LAGraph_Cached_OutDegree: determine G->out_degree
//------------------------------------------------------------------------------
// LAGraph, (c) 2019-2022 by The LAGraph Contributors, All Rights Reserved.
// SPDX-License-Identifier: BSD-2-Clause
//
// For additional details (including references to third party source code and
// other files) see the LICENSE file or contact permission@sei.cmu.edu. See
// Contributors.txt for a full list of contributors. Created, in part, with
// funding and support from the U.S. Government (see Acknowledgments.txt file).
// DM22-0790
// Contributed by Timothy A. Davis, Texas A&M University
//------------------------------------------------------------------------------
// LAGraph_Cached_OutDegree computes G->out_degree, where G->out_degree(i) is
// the number of entries in G->A (i,:). If there are no entries in G->A (i,:),
// G->rowdgree(i) is not present in the structure of G->out_degree. That is,
// G->out_degree contains no explicit zero entries.
#define LG_FREE_WORK \
{ \
GrB_free (&x) ; \
}
#define LG_FREE_ALL \
{ \
LG_FREE_WORK ; \
GrB_free (&out_degree) ; \
}
#include "LG_internal.h"
int LAGraph_Cached_OutDegree
(
// input/output:
LAGraph_Graph G, // graph to determine G->out_degree
char *msg
)
{
//--------------------------------------------------------------------------
// clear msg and check G
//--------------------------------------------------------------------------
GrB_Vector out_degree = NULL, x = NULL ;
LG_CLEAR_MSG_AND_BASIC_ASSERT (G, msg) ;
if (G->out_degree != NULL)
{
// G->out_degree already computed
return (GrB_SUCCESS) ;
}
//--------------------------------------------------------------------------
// determine the size of A
//--------------------------------------------------------------------------
GrB_Matrix A = G->A ;
GrB_Index nrows, ncols ;
GRB_TRY (GrB_Matrix_nrows (&nrows, A)) ;
GRB_TRY (GrB_Matrix_ncols (&ncols, A)) ;
//--------------------------------------------------------------------------
// compute the out_degree
//--------------------------------------------------------------------------
GRB_TRY (GrB_Vector_new (&out_degree, GrB_INT64, nrows)) ;
// x = zeros (ncols,1)
GRB_TRY (GrB_Vector_new (&x, GrB_INT64, ncols)) ;
GRB_TRY (GrB_assign (x, NULL, NULL, 0, GrB_ALL, ncols, NULL)) ;
GRB_TRY (GrB_mxv (out_degree, NULL, NULL, LAGraph_plus_one_int64,
A, x, NULL)) ;
G->out_degree = out_degree ;
LG_FREE_WORK ;
return (GrB_SUCCESS) ;
}