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function C = load (filename)
%GRB.LOAD Load a single GraphBLAS matrix from a file.
% C = GrB.load (filename) loads a single @GrB matrix from a file. The file
% must have been previously created by GrB.save. If the filename is not
% present, it defaults to 'GrB_Matrix.mat'.
%
% Examples:
%
% A = GrB.random (4, 4, 0.5)
% GrB.save (A) ; % A can be a @GrB or built-in matrix
% clear all
% A = GrB.load ('A.mat') ; % A is now a @GrB matrix
%
% % saving a matrix expression
% GrB.save (2*A-1) % save a matrix computation to GrB_Matrix.mat
% GrB.load % load it back in
%
% See also GrB.save, GrB/struct, GrB.serialize, GrB.deserialize.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
if (nargin < 1)
filename = 'GrB_Matrix.mat' ;
end
% load in the opaque struct from the file
S = load (filename, 'GraphBLAS_struct_from_GrB_save') ;
% convert it to a @GrB object
C = GrB (S.GraphBLAS_struct_from_GrB_save) ;
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