GNU Scientific Library Reference Manual - Revised Second Edition (v1.8) by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, M. Booth, F. Rossi Paperback (6"x9"), 636 pages, 60 figures ISBN 0954161734 RRP £24.99 ($39.99) Get a printed copy>>>

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7.8.1 3-j Symbols

Function: double gsl_sf_coupling_3j (int two_ja, int two_jb, int two_jc, int two_ma, int two_mb, int two_mc)

Function: int gsl_sf_coupling_3j_e (int two_ja, int two_jb, int two_jc, int two_ma, int two_mb, int two_mc, gsl_sf_result * result)

These routines compute the Wigner 3-j coefficient,

(ja jb jc
 ma mb mc)

where the arguments are given in half-integer units, ja = two_ja/2, ma = two_ma/2, etc.