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Section: Inspection Functions
Returns the size of a variable. There are two syntaxes for its use. The first syntax returns the size of the array as a vector of integers, one integer for each dimension
[d1,d2,...,dn] = size(x)
 The other format returns the size of x along a particular dimension: 
d = size(x,n)
 where n is the dimension along which to return the size. 
--> a = randn(23,12,5); --> size(a) ans = 23 12 5
Here is an example of the second form of size.
--> size(a,2) ans = 12