## Splitting 1 column array

on 15 Aug 2012

### Walter Roberson (view profile)

Hi all,
I have various column matrices with varying number of elements from 38-202. I want to split each matrix into 5 small matrices each containing the same number of elements. The distribution of numbers into each can be random. If the original matrix has more elements, some can be ignored as well. Like for example if the original matrix has 204 elements and I want to split it into 5 matrices. So only 200 elements can be shuffled and 4 need to be ignored.
Is there any function in MATLAB I can use?
Nancy

Azzi Abdelmalek

### Azzi Abdelmalek (view profile)

on 15 Aug 2012
are the matrix square?

### Walter Roberson (view profile)

on 16 Aug 2012

num_subsets = 5;
matlen = length(YourVector);
num_to_use = matlen - mod( matlen, num_subsets );
idx = randperm(matlen);
shuffled = YourVector(idx(1:num_to_use));
subsets = reshape(shuffled, [], num_subsets);
The subsets would then be the columns.

Azzi Abdelmalek

### Azzi Abdelmalek (view profile)

on 16 Aug 2012
the result is one matrix
Walter Roberson

### Walter Roberson (view profile)

on 16 Aug 2012
Yes, but I did indicate that the subsets would be the columns. Splitting into individual matrices is usually not a good idea in this kind of situation.
Nancy

### Nancy (view profile)

on 16 Aug 2012
Works perfectly. Thanks Walter :)

### Azzi Abdelmalek (view profile)

on 15 Aug 2012

example
A=rand(102,2);B=A(1:100,:)
result=reshape(B,5,8,5)

Walter Roberson

### Walter Roberson (view profile)

on 16 Aug 2012
Not quite, as that does not do any shuffling.