splitting a signal

I am having 20 signals each of 24sec.I want to split it into 2 equal halves.(for example if i am having 20 signals it should be divided into two halves of 40 signals) i tried with indexing method i.e. i have used (1:end/2). It displays only the first half signal. It is not considering the second half.Please suggest me how to split a signal.

Answer 1

[Fangjun Jiang]

You are half done. The other half is in (end/2:end)

[Walter Roberson]

If you use end/2 as the endpoint of the first signal and the start of the next, then one sample will be duplicated between the two.

[pravena duplex]

I tried with that command it displays only the first half of the signal i.e, I'm getting only 20 signals whereas I should get 40.

[Fangjun Jiang]

Walter had a good point! If a=1:40, then a(1:end/2) and a(end/2:end) have one data sample over-lapped. If a=1:41, a(end/2:end) and a(end/2:end) work out correctly (assume second half has 1 more data sample). But still, it is better to take care of it specifically using round().

Answer 2

[Wayne King]

The question is how do you want to split them. It sounds like you want them into the first half and second half. Assuming your signals are in columns of your matrix.

X = randn(100,20);
X1 = X(:,1:size(X,2)/2);
X2 = X(:,size(X,2)/2+1:end);

[pravena duplex]

I tried with that command but it displays only the first half of the signal i.e, I'm getting only 20 signals whereas I should get 40.(Tested with 20 signals)