Usage of cputime or tic toc in a Matlab Function Block

Hello everyone,

I want to use Tic and Toc inside a function of a Simulink Matlab Function Block.

I have this code inside the Matlab Function Block:

function y = fcn(u)
starttime = cputime
sampleTime = 0.01;
        if u == 0
            y = 1;
        else u == 1
            y = 0;
        end
finaltime = cputime - starttime
%y = 2*u;
end

And this I get:

Function 'cputime' is not supported for code generation. Consider adding coder.extrinsic('cputime') at the top of the function to bypass code generation. Function 'MATLAB Function BITS COUNTER' (#29.32.39), line 2, column 13: "cputime" Launch diagnostic report.

Component:MATLAB Function | Category:Coder error

Can someone give some help about how to use cputime inside a function block?

Thanks in advance.

William

Answer 1

[Nisarg Shah]

Hi William,

Code generation capabilities for Tic/Toc were added in R2019a. Refer to the doc link below for more information:

https://www.mathworks.com/help/matlab/ref/tic.html#mw_9bdbc46b-87b1-492b-b0e6-caeb3e886db4

Note that 'cputime' does not support code generation.

Example code snippet for a Matlab Function Block:

function [y,t] = fcn(u)    % 'u' and 'y' are 200x200 matrix of doubles, 't' is s scalar double

y = coder.nullcopy(u);

tic;    % START TIMER
for i = 1:numel(u)
    y(i) = u(i) + 3;
end

t = toc;    % STOP TIMER AND LOG TIME AS OUTPUT
end

Regards,

Nisarg Shah