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Divide a data set into sub data sets

Asked by dav

dav

on 26 Sep 2013
Latest activity Commented on by dav

dav

on 27 Sep 2013
Accepted Answer by Azzi Abdelmalek

Azzi Abdelmalek

Hi,

I am running a simulation program.

There, in every simulation run it creates a data set of size T. I would like to know if there's a loop I can use to divide this data set into 20 sub data sets of equal size and randomly choose a data set, among the 20 sub data sets, to be used in a different pat of the program.

any help is greatly appreciated.

Dav.

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dav

dav

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2 Answers

Answer by Azzi Abdelmalek

Azzi Abdelmalek

on 26 Sep 2013
Accepted answer
A=1:100  % Example
data=reshape(A,[],20) % each column represent your part of data
id=randi(20)
random_vector=data(:,id)

4 Comments

Azzi Abdelmalek

Azzi Abdelmalek

on 27 Sep 2013

I do not know what (sample a vector under sampling with replacement) means. The code pick randomly a vector from the 20 parts, but it can pick the same another time

Azzi Abdelmalek

Azzi Abdelmalek

on 27 Sep 2013

If you want to avoid repetition

A=1:100  % Example
data=reshape(A,[],20) % each column represent your part of data
[n,m]=size(data);
id=randi(m)
random_vector=data(:,id)
data(:,id)=[]
dav

dav

on 27 Sep 2013

thank you very much!

Azzi Abdelmalek

Azzi Abdelmalek

Answer by Jan Simon

Jan Simon

on 27 Sep 2013

The question is not clear. You have T "data sets" (what ever this mean) and want to divide it in 20 "sets" of equal size. Is T dividable by 20? Should the new data sets contain repetitions, e.g. is this allowed:

aNewDataSet = [T(1), T(1), T(3:end)]

Should the new data sets be elementwise distinct or is this allowed:

newDataSet(1) = [T(1), T(3:10)]
newDataSet(2) = [T(1), T(4:11)]

When only one data set is used afterwards, why creating 20 of them at first?

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Jan Simon

Jan Simon

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