How can I generate random numbers

2013 4 14
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I have along data series which contains 3451 elements. From this I want to select 1/3 rd of the elements for validation purpose and the remaining for test. How can I randomly make the selection randomly? Thanks .

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Image Analyst
Image Analyst 2013-4-14
编辑：Image Analyst 2013-4-14

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Use randperm(), as this demo illustrates:
% Define the number of elements to use.
numberOfElements = 3451;
oneThird = int32(floor(numberOfElements / 3));
% Get all the indexes scrambled in a random order.
randomOrder = int32(randperm(3451));
% Select a third of them for "Validation."
indexesForValidation = randomOrder(1:oneThird);
% Select the remainder of them for "testing."
indexesForTesting = randomOrder(oneThird+1:end);

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Ede gerlderlands
Ede gerlderlands 2013-4-14
Sorry I think Index for testing doesn't seems to work for me.
Image Analyst
Image Analyst 2013-4-14
编辑：Image Analyst 2013-4-14
I fixed a small bug. Try it now.
Ede gerlderlands
Ede gerlderlands 2013-4-14
yes , it works tnx.

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