Algorithm 743: WAPR: A Fortran Routine for Calculating Real Values of the W-Function

Abstract

We implement the W-function approximation scheme described by Barry et al. [1995]. A range of tests of the approximations is included so that the code can be assessed on any given machine. Users can calculate W(x) by specifying x itself or by specifying an offset from exp(1), the latter option necessitated by rounding errors that can arise for x close to exp(1). Results of running the code on a SUN workstation are included. © 1995, ACM. All rights reserved.