Lambert W function with negative branch in R?

03 March 2013 1 860 Report

How can one generate a negative branch of the Lambert W function R? I found the following helpful: http://rss.acs.unt.edu/Rdoc/library/gsl/html/Lambert.html

but it is only for positive side.

Ross Boczar

Looking at the header file gsl_sf_lamber.h, the second function in the link you provided,

lambert_Wm1(x, give=FALSE,strict=TRUE)

is the second branch.

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