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Algorithm 742: WAPR: A Fortran routine for calculating real values of the W-function. (English) Zbl 0886.65011
Summary: We implement the W-function approximation scheme described by the authors [ibid. 21, No. 2, 161-171 (1995; reviewed above)]. 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.

65D20Computation of special functions, construction of tables
33-04Machine computation, programs (special functions)
33B10Exponential and trigonometric functions