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We present a new Fortran library to evaluate all harmonic polylogarithms up to weight four numerically for any complex argument. The algorithm is based on a reduction of harmonic polylogarithms up to weight four to a minimal set of basis functions that are computed numerically using series expansions allowing for fast and reliable numerical results.
Program title: Chaplin
Catalogue identifier: AETC_v1_0
Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AETC_v1_0.html
Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland
Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html
No. of lines in distributed program, including test data, etc.: 101192
No. of bytes in distributed program, including test data, etc.: 729234
Distribution format: tar.gz
Programming language: Fortran 77.
Computer: Computing systems on which Fortran 77 compilers are available.
Operating system: Operating systems on which Fortran 77 compilers are available.
Classification: 11.1.
Nature of problem:
Numerical evaluation of harmonic polylogarithms.
Solution method:
Inside the unit circle: series expansion. Outside the unit circle: inversion relations.
Restrictions:
Only harmonic polylogarithms up to weight four are supported.
Unusual features:
Allows the evaluation of HPL’s numerically for any point in the complex plane.
Running time:
Depending on the weight vector and argument of the HPL, between 0.2 and 400 μs.