FreeMat
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Section: Numerical Methods
The trapz routine has the following syntax @[ z = trapz(x,y) @] where |x| is a dependent vector and |y| an m-by-n matrix equal in at least one dimension to x. (e.g.:|x| = time samples, y = f(t))
Alternatively, you can enter
z = trapz(y)
for a unit integration of y.
If y is a matrix, m must be equal to length(x) (e.g.: y must have the same number of rows as x has elements). In this case, integrals are taken for each row, returned in a resulting vector z of dimension (1,n)