MATLAB 5 now supports arrays with more than two
dimensions. Multidimensional arrays can be
numeric, character, cell, or structure arrays.

Multidimensional arrays are broadly useful ---
for example, in the representation of multivariate
data or multiple pages of two dimensional data.
MATLAB provides a number of functions that directly
support multidimensional arrays. You can extend
this support by creating M-files that work with your
data architecture.