Infinite loop in Matlab Fctn Block

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William
William on 22 Apr 2014
Commented: Niklas Nylén on 22 Apr 2014
Why did I run into infinite loop (see coode below)? Also, I tried to stop the simulation by clicking on the stop button on the model window but it didn' work. i is the input from a ramp function in Simulink model. Thanks
function [y1,y2] = UPC(i) %#codegen persistent ii ii=0; if isempty(ii) y1=ii; y2=ii; else y1=i; y2=i; end while (i<5) y1=i+1; y2=i-1; end_ *_ *

Accepted Answer

Niklas Nylén
Niklas Nylén on 22 Apr 2014
Edited: Niklas Nylén on 22 Apr 2014
The condition to exit the while loop is that i>=5 and you never change the value of i in the loop, which means you will never exit the loop if the input value of i is less than 5.
For every time step in your model the code in an embedded matlab code block will run from the first line of code to the last. What it looks like is that you want to perform the operation inside the while loop if i<5, not while i<5.
  2 Comments
Niklas Nylén
Niklas Nylén on 22 Apr 2014
No, since all the code in the embedded code block will run on every iteration of the model. What I'm guessing you would like to do is something like this:
function [y1,y2] = UPC(i)
%#codegen
if i<5
y1=i+1;
y2=i-1;
else
y1=i;
y2=i;
end
The code above will run once for every time step of the simulink model. You do not need to add a loop inside the code to keep it running with the model.

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