toms743, an Octave code which evaluates Lambert's W function. This is a version of ACM TOMS algorithm 743, by Barry, Barry and Culligan-Hensley.
Lambert's W function W(X) satisfies the equation
W(x) * exp ( W(x) ) = x
The text of many ACM TOMS algorithms is available online through ACM: https://calgo.acm.org/ or NETLIB: https://www.netlib.org/toms/index.html.
The information on this web page is distributed under the MIT license.
toms743 is available in a C version and a C++ version and a Fortran77 version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
test_values, an Octave code which contains routines which return sample values of various functions, including the modified beta function, and the logarithm of the gamma function.
toms443, an Octave code which evaluates lambert's w function. this is a version of acm toms algorithm 443.