How can I include membership function inside a piece-wise function?

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Kris
Kris 2017-8-10
回答： Robert U 2017-8-11
I'm trying to graph a piecewise function containing sigmoid membership function, however the result is always returned with dimension mismatch error. Any idea? Thanks.
Here's the code:
x= 0:.1:20;
y(0<=x & x<=10) = sigmf(x,[1 5]);
y(10<x & x<=20) = 1;
plot(x,y)

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回答（1 个）

Robert U
Robert U 2017-8-11
Hi Kris,
since you are using logical indexing, you must account for different sized vectors you want to write on (in your example the length of y is not the same as x). One possibility is to initialize the vector y by one and overwrite the values y(0<=x & x<=10):
x= 0:.1:20;
y = ones(1,length(x));
y(0<=x & x<=10) = sigmf(x(0<=x & x<=10), [1 5]);
plot(x,y)
Kind regards,
Robert

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