How can I use individual matrices for training, cross validation and testing of my neural network?

I want to derive a neural network model but I have my training, validation and test data in three individual matrices. Is there any way to force the network to choose the data of the appropriate matrix rather putting all of the data in a single matrix and dividing them based on indices?

Thanks

Amir

Answer 1

[Greg Heath]

I can't think of an alternate way.

What is wrong with putting them all in one matrix?