You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: isbycol.m
    path of file: ./repos/SuiteSparse/GraphBLAS/GraphBLAS/@GrB
    
    the code of the file until where you have to start completion: function s = isbycol (A)
%GRB.ISBYCOL true if A is stored by column, false if by column.

    
function s = isbycol (A)
%GRB.ISBYCOL true if A is stored by column, false if by column.
% s = GrB.isbycol (A) is true if A is stored by column, false if by row.
% A may be a GraphBLAS matrix or built-in matrix (sparse or full).
% Built-in matrices are always stored by column.
%
% See also GrB.isbyrow, GrB.format.

% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2023, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0

if (isobject (A))
    A = A.opaque ;
    s = isequal (gbformat (A), 'by col')  ;
else
    s = true ;
end