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lamW is an R package which calculates the real-valued branches of the Lambert-W function without the need to install the entire GSL. It uses compiled code and RcppParallel to achieve significant speed.


If you use the package, please cite it as:

Avraham Adler (2015). lamW: Lambert-W Function. R package version 1.3.3.

A BibTeX entry for LaTeX users is:

    title = {lamW: Lambert-W Function},
    author = {Avraham Adler},
    year = {2015},
    url = {},
    note = {R package version 1.3.3.},


Please ensure that all contributions comply with both R and CRAN standards for packages.


This project attempts to follow Semantic Versioning


This project attempts to follow the changelog system at Keep a CHANGELOG


This project intends to have as few dependancies as possible. Please consider that when writing code.


Please review and conform to the current code stylistic choices (e.g. 80 character lines, two-space indentations).


Please provide valid .Rd files and not roxygen-style documentation.


Please review the current test suite and supply similar testthat-compatible unit tests for all added functionality.


If you would like to contribute to the project, it may be prudent to first contact the maintainer via email. A request or suggestion may be raised as an issue as well. To supply a pull request (PR), please:

  1. Fork the project and then clone into your own local repository
  2. Create a branch in your repository in which you will make your changes
  3. Push that branch to your remote and then create a pull request

At this point, the PR will be discussed and eventually accepted or rejected.