size  Dimensions of a Spot operator.
 
    D = size(A), for an M-by-N Spot operator A, returns the
    two-element row vectors D = [M,N].
 
    [M,N] = size(A) returns M and N as separate arguments.
 
    M = size(A,DIM) retuns the length of the dimension specified by
    the scalar DIM.  Note that DIM must be 1 or 2.