LAMBERTW Lambert's W function.
W = LAMBERTW(X) is the solution to w*exp(w) = x.
W = LAMBERTW(K,X) is the K-th branch of this multi-valued function.
Reference: Robert M. Corless, G. H. Gonnet, D. E. G. Hare,
D. J. Jeffrey, and D. E. Knuth, "On the Lambert W Function",
Advances in Computational Mathematics, volume 5, 1996, pp. 329-359.
Also available from:
http://pineapple.apmaths.uwo.ca/~rmc...rtW/index.html
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