math - Lambert W function implementation in Java -

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i'm working on project , have found myself in situation need function able @ least approximation of value of w(x), lambert w function, x can real number. i'm working in java. couldn't find implementations of w in java when searched. willing code implementation myself if need be, unsure of how done right now. pushes in right direction appreciated.

take @ page: http://mathworld.wolfram.com/lambertw-function.html

it lists approximation z>3 series expansion function.

you can use newton's method , halley's method approximate function: http://en.wikipedia.org/wiki/lambert_w_function#numerical_evaluation


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