Matlab function help in simulink model

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Pramit Biswas
Pramit Biswas 2013-8-19
http://imagesup.net/?di=213769298274
i want to write this function in Matlab Function Box
{
function y = func_name(a)
b=b+a;
y=b;
}
the error is b is not defined
Actually I want write code for integration and derivative block

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Azzi Abdelmalek
Azzi Abdelmalek 2013-8-19
编辑：Azzi Abdelmalek 2013-8-19
function y = func_name(a)
persistent b
if isempty(b)
b=0;
end
b=b+a;
y=b;
Look at persistent
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Pramit Biswas
Pramit Biswas 2013-8-20
1. Learn: How matlab works, what actually happen on this block? logic/math to program in real time; I know that integration can be written as summation. but that theory not works on real time/simulation mode
2. I want to take "to the power" of the signal:Derivative^variable1

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