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

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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)

Accepted Answer

Torsten on 31 Mar 2022
a = 3;
b = 12;
x = 0:0.01:12;
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;

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