splitting panel data for training and testing

Hi all..for artificial neural network, the data need to be split for training and testing.

How could i done this in matlab if my data is panel data?i have 160 companies and each company consist of 23 years of data.

I would like to split 16 years for training and 7 years for testing.

Thanks

[Greg Heath]

INSUFFICIENT INFO:

what is panel data ???

[ rows columns] = size(dataset) ???

[BERGHOUT Tarek]

more information please