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Matlab function to return elapsed time since first function call

This simple Matlab function is usefull as a Wall-clock elapsed time provider e.g. for Simulink models. It returns the elapsed time in seconds since the first function call.

function t = elapsedTime()
%ELAPSEDTIME Returns wall clock seconds since the first call.
%   t = ELAPSEDTIME() returns the number of seconds passed since the first
%   call to this function (wall clock time).

    persistent t0
    if isempty(t0)
        t0 = tic;   % Start timer on the first call
    end
    t = toc(t0);    % Elapsed time since first call
end

You can use this in Matlab or in a Simulink model:

Simulink wall clock