| FreeMat
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Section: Inspection Functions
Returns the length of an array x. The syntax for its use is 
y = length(x)
 and is defined as the maximum length of x along any of its dimensions, i.e., max(size(x)). If you want to determine the number of elements in x, use the numel function instead. 
For a 4 x 4 x 3 matrix, the length is 4, not 48, as you might expect.
--> x = rand(4,4,3); --> length(x) ans = 4