Change to vander.m

[Thomas Weber]

I'd like to propose the attached patch to vander.m.

Advantage: it's faster for large arguments (a vector size of 3 has a
comparable speed).

Disadvantages: slower for length(c) == 2 and it needs more memory
(although if the memory needs start to be a problem, the for-loop in the
current implementation will hit even harder).

	Thomas
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