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: timing.m
    path of file: ./repos/SuiteSparse/GraphBLAS/GraphBLAS/@GrB
    
    the code of the file until where you have to start completion: function t = timing (c)
%GRB.TIMING get/set the GraphBLAS diagnostic timings
%
%   t = GrB.timing ;      % get the current timings, do not clear them.
%   t = GrB.timing (0) ;  % get the current timings, and clear them.
%
% This method is for development only, and returns t as all zero when
% GraphBLAS is compiled for production use.  GraphBLAS must be compiled
% with -DGB_TIMING for timers to be enabled.
%
% See also spparms.

    
function t = timing (c)
%GRB.TIMING get/set the GraphBLAS diagnostic timings
%
%   t = GrB.timing ;      % get the current timings, do not clear them.
%   t = GrB.timing (0) ;  % get the current timings, and clear them.
%
% This method is for development only, and returns t as all zero when
% GraphBLAS is compiled for production use.  GraphBLAS must be compiled
% with -DGB_TIMING for timers to be enabled.
%
% See also spparms.

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

if (nargin == 0)
    t = gbtiming ;
else
    t = gbtiming (c) ;
end