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Algorithms 683: A Portable FORTRAN Subroutine for Exponential Integrals of a Complex Argument

ACM Transactions on Mathematical Software (TOMS) (1990) 16(2) 178-182
DOI: 10.1145/78928.78934
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Abstract

The algorithm computes exponential integrals En1990 for integer orders n ≥ 1 and complex z in -π < arg z ≤ π. Both single and double precision subroutines are provided. Exponential scaling and stable sequence generation are auxiliary options. © 1990, ACM. All rights reserved.

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Amos, D. E. (1990). Algorithms 683: A Portable FORTRAN Subroutine for Exponential Integrals of a Complex Argument. ACM Transactions on Mathematical Software (TOMS), 16(2), 178–182. https://doi.org/10.1145/78928.78934

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