How to create a separate function file for a piecewise function?

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Grigorios Chatziandreou 2022-3-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1685219-how-to-create-a-separate-function-file-for-a-piecewise-function

评论： Stephen23 2022-3-31

采纳的回答： Torsten

How do I create a function with the function:

f(x) = -ax+b for 0<x<b/a and f(x)=0 for x>b/a?

I want it in a seprate file.

How do I then use it in my main code? (call it)

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Stephen23 2022-3-31

What should be the value for x<=0 ?

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采纳的回答

Torsten 2022-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/1685219-how-to-create-a-separate-function-file-for-a-piecewise-function#answer_931339

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a = 3;
b = 12;
x = 0:0.01:12;
plot(x,f(a,b,x))
function pw = f(a,b,x)
  pw = NaN(size(x));
  idx = x>0 & x<b/a;
  jdx = x>=b/a;
  pw(idx) = -a*x(idx)+b;
  pw(jdx) = 0;
end 

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