function [C,k] = gbvreduce (Cin, M, accum, op, A, desc)      %#ok

% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0

error ('GrB:mex', 'mexFunction not found; use gbmake to compile GraphBLAS') ;

