期刊
ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE
卷 39, 期 2, 页码 -出版社
ASSOC COMPUTING MACHINERY
DOI: 10.1145/2427023.2427031
关键词
Algorithms; Incomplete gamma function
An algorithm for accurately computing the lower incomplete gamma function gamma (alpha, t) in the case where alpha = n + 1/2, n is an element of Z and t < 0 is described. Series expansions and analytic continuation are employed to compute the function for certain critical values of n, and these results are used to initiate stable recurrence. The algorithm has been implemented in Fortran 2003, with precompuations carried out in Maple.
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