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

Question

lady bird 2019-6-19

0
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https://ww2.mathworks.cn/matlabcentral/answers/467896-how-to-initialize-outpt-of-a-matlab-function-block-in-simulink-to-zero

编辑： Gert Kruger 2019-6-27

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

Regards

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Answer 1

Gert Kruger 2019-6-19

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https://ww2.mathworks.cn/matlabcentral/answers/467896-how-to-initialize-outpt-of-a-matlab-function-block-in-simulink-to-zero#answer_379959

编辑：Gert Kruger 2019-6-27

在 MATLAB Online 中打开

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;
end
if (x==1)
    y = 0;    %y is 0 on the first simulation time step
else
    y = 1;    %y is 1 on for the rest
end