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

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.

Answer 1

[Honglei Chen]

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

[Marco]

Thank you very much!! It works ;)