[R] convex nonnegative basis vectors in nullspace of matrix

[capy_bara]

Hi
the solution with linear programming works very well!
Even if I take more 'realistic' matrices with dimensions of about  25x60,
the calculation of the basis goes well (if I increase the number of
iterations to 1000).
Meanwhile I also found an algorithm for an exact calculation of the extreme
rays of the cone (Appendix in
http://www.sciencedirect.com/science/article/pii/S0022519300910737).
When I have time I will try to implement this solution as well and compare
the performances, but the one I have now works fine in my application.
Many thanks,
Hannes

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