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How to initialize outpt of a matlab function block in simulink to zero

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lady bird
lady bird on 19 Jun 2019
Edited: Gert Kruger on 27 Jun 2019
Hello all;
I have designed a control system for a robot manipulator using simulink which includes several matlab function blocks.
My question how is it possible to initialize the input of the controller τ to zero at the start of the simulink simulation
Thank you in advance for your help

Answers (1)

Gert Kruger
Gert Kruger on 19 Jun 2019
Edited: Gert Kruger on 27 Jun 2019
You can add a persistent variable and check if it is empty. If it is empty, then it means it is the first time the Matlab function block is being executed, in which case you can set the output to be zero.
Example code:
function y = fcn(u)
persistent x
if isempty(x)
x = 1;
if (x==1)
y = 0; %y is 0 on the first simulation time step
y = 1; %y is 1 on for the rest
Gert Kruger
Gert Kruger on 27 Jun 2019
lady bird,
perhaps you can upload your model if you are still having problems.

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