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Section: Elementary Functions
Reshapes an n-dimensional array into a column vector. The general syntax for its use is
y = vec(x)
 where x is an n-dimensional array (not necessarily numeric). This function is equivalent to the expression y = x(:). 
A simple example of the vec operator reshaping a 2D matrix:
--> A = [1,2,4,3;2,3,4,5] A = 1 2 4 3 2 3 4 5 --> vec(A) ans = 1 2 2 3 4 4 3 5