MATLAB Answers


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

Asked by lady bird on 19 Jun 2019
Latest activity Edited by 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


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1 Answer

Answer by Gert Kruger on 19 Jun 2019
Edited by 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


Thank you for your answer , i created this function just after the block that computes the τ, but it didn't initialize it to zero.
lady bird,
perhaps you can upload your model if you are still having problems.

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