How to trim time series?

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X = rand(1,128)-0.5;
fs = 1000;
Ts = 1/fs;
Y = lowpass(X,100,fs);
Z = conv(X,Y);
THE length of Z is 255
I want to trim the ends off Z so that it has a length of 128.
What do I have to do?

Accepted Answer

Ravi Narasimhan
Ravi Narasimhan on 2 Oct 2021
Edited: Ravi Narasimhan on 2 Oct 2021
Are you trying to discard elements 129 through 255?
If so,
Z(129:end) = []; % Discard the unwanted elements
Z=Z(1:128); % Keep the desired elements
should do it.

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