How can one specify fixed number of interleaved items for training, validation and test set in a Matlab feedforwardnet?

I have a dataset set of 16300 items. I want to create a feedforwardnet, that has 1000 items in each of training, validation and test set. I want the items to be spread evenly over the dataset, so choose to use divideint (interleaved).

I attempted to do this (as I do not find a way to specify Q=3000)

net.divideFcn = 'divideint';
net.divideParam.trainRatio = 0.0735;
net.divideParam.valRatio = 0.0735;
net.divideParam.testRatio=0.0735;

I observe all sets now get 1/3 of the data items, not as I intended.

How can I solve this?

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