MATLAB: Splitting 1 column array

columnsplit

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

Best Answer

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.

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n=10;. 
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Try this:

data = [1:50000]'; % Whatever.....
% Define general parameters for getting the samples:
numElements = size(data, 1)
numAdjacent = 48
numSubsets = 1000
% Now do the iterations to get each of the 1000 subsets.
for k = 1 : numSubsets
	% Get the first index at random.  Don't get within numAdjacent of the end though!
	firstIndex = randi(numElements - numAdjacent + 1);
	% Now get the second index which will make the subset have adjacent indexes.
	secondIndex = firstIndex + numAdjacent - 1;
	% Get one subset of 48 adjacent data samples.
	theseData = data(firstIndex : secondIndex);
	% Now do something with this set of adjacent elements.
end

Best Answer

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