for loop saving a vector, not a value

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if i had
x = -10:0.1:10;
f1 = trapmf(x,[-2 0 0 2]);
how do i save the (x, f1) values of each iterations using the for loop?
I'm thinking it starts with something like
i = 1:length(x)
a = x(i);
b = f1(i);
but this will only give me a & b to be 1 value not a vector of length(x)

Accepted Answer

Image Analyst
Image Analyst on 13 Jun 2015
How about
for i = 1:length(x)
a(i) = x(i);
b(i) = f1(i);
if you wanted/needed to assign a and b via a "for" loop?
soloby on 13 Jun 2015
that works. but i guess that's an unnecessary step since x and f1 are already the same thing.
Do you know of a way to divide my f1 function, which is a triangular wave, into 2 parts: values left of the peak and right of the peak?
thanks in advance.
Image Analyst
Image Analyst on 13 Jun 2015
I don't see why you say "x and f1 are already the same thing" but I don't have the fuzzy toolbox so I can't actually run trapmf().
To divide into two parts
[maxValue, indexAtMax] = max(b);
leftOfPeak = b(1 : indexAtMax-1);
rightOfPeak = b(indexAtMax+1 : end);
Note that the peak itself is not included in either of those arrays because you did not specify that it should be.

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