convert array dimensions 12 channels

I have file with 50 rows and 12 columns [50 x 12] , how can i convert this file to [50 x 1 x 12] where 12 it is like channels in an image, for example for rgb images would be [50 x 20 x 3] in my case I wanted to be 12 channels

thanks for your help

Answer 1

[KALYAN ACHARJYA]

reshape(data,[50,1,12])

[Mauricio Piraquive]

Thanks, and then how can I save this rtesult into a .mat file?