Subplot in MATLAB by using 3d matrix

Hello

subplot(2, 1, 1), plot(Utility);

subplot(2, 1, 2), plot(AggreThroughput);

I would like to use subplot function but by considering that my matrix is 3d, I encountered the following error:

Matrix may not have more than 2 dimensions.

How can I convert it to 3d matrix?

Thanks

[Stephen23]

@hamed: please edit your comment and give the complete error message, this means all of the red text.

Also please tell us exactly what these commands return:

 size(Utility)
 size(AggreThroughput)

and what you want to see when they are plotted.