Matlab Function block: how to output the result in different instants of time

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Marco
Marco 2014-7-21
评论： Marco 2014-7-21
Hello everybody,
is there a way to output the result of a Matlab Function block in Simulink in different instants of time? In other words, assuming that my function block contains this trivial code, and suppose to link it to a display block:
input = 5;
for i = 1:10
pause(1); % I know, it doesn't work, I write it just for explain that I want to output the result of the computation every 1 sec
output = i*input;
end
if I run a simulation on Simulink, it outputs directly 50. I would read on the display 5...10...15......50, where ... it stands for "1 sec pause". How can I do it?
Thanks.

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Honglei Chen
Honglei Chen 2014-7-21
The MATLAB Function block is called once at each time instance so to do what you want, you need to have a state that updates at each time hit. Here is a simple example of that using persistent variables
function y = fcn
%#codegen
persistent u
if isempty(u)
u = 0;
else
u = u+1;
end
y = 5*u;
You should set the simulink solver to discrete with fixed step, and you can set the time step to 1.
HTH

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