Asked by Lisa Justin
on 3 Dec 2012

Hi, I am working with a set of data and i need all of them to be the same length. how can i do this?

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Answer by Jan Simon
on 3 Dec 2012

Accepted answer

It depends. As said already you can crop the longer ones, pad the shorter ones or apply an interpolation. For the latter there are linear, cubic, spline, bsline, trigonometric and more complicated interpolation methods.

aliya
on 1 Jun 2015

What if we have multiple signals from a database of different sizes. how to make their length equal?

Walter Roberson
on 1 Jun 2015

Find the maximum of their lengths, say maxlen. Then for each,

ifft(fft(TheSignal),maxlen)

Answer by Walter Roberson
on 3 Dec 2012

S1 = size(FirstMatrix); S2 = size(SecondMatrix); MaxS = max(S1, S2);

if MaxS(1) > S1(1); FirstMatrix(end+1:MaxS(1), :) = 0; end if MaxS(2) > S1(2); FirstMatrix(:, end+1:MaxS(2)) = 0; end

if MaxS(1) > S2(1); SecondMatrix(end+1:MaxS(1), :) = 0; end if MaxS(2) > S2(2); SecondMatrix(:, end+1:MaxS(2)) = 0; end

You can simplify this a bit if you are using vectors and you know the orientation of the vectors.

Walter Roberson
on 3 Dec 2012

Ah... did you want to do this by clipping the longer ones to the length of the shorter?

Lisa Justin
on 3 Dec 2012

yes exactly. But then i lose some relevant part of the signal which is not good either. I am a bit unsure how best to make all the length equal. they are about 600 files

chaitanya
on 27 Feb 2016

thanks..it is useful

Answer by Muruganandham Subramanian
on 3 Dec 2012

Can you provide the data? you can do it by adding zeros, ones, any desirable data to the data having minimum sizes from data having maximum sizes by initializing max. data length caustiously..

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