[Bug-gsl] GSL: suggestion, E_n

[Oleg V. Motygin]

Dear GSL group,

Thank you very much for your work on GSL. I use it much in Octave.

I think it would be great if you could improve the GSL routines
for computations of exponential integrals so that they can accept 
complex arguments too. A good algorithm for this was published in

ACM Transactions on Mathematical Software
Donald E. Amos, Computation of Exponential Integrals of a Complex 
Argument, vol.16, no. 2, p.169--177, 1990,
http://doi.acm.org/10.1145/78928.78933

ACM Transactions on Mathematical Software
Donald E. Amos, Algorithm 683: A Portable FORTRAN Subroutine for 
Exponential Integrals of a Complex Argument, vol.16, no. 2,
p.178--182, 1990,
http://doi.acm.org/10.1145/78928.78934

The fortran code is available at
http://www.netlib.org/toms/683
http://www.netlib.no/netlib/toms/683
http://www.mirrorservice.org/sites/netlib.bell-labs.com/netlib/toms/683.gz
http://scicomp.ewha.ac.kr/netlib/toms/683

With best wishes,
Oleg

---
D.Sc. Oleg V. Motygin,
Institute of Problems in Mech Engineering
Russian Academy of Sciences
V.O., Bol'shoj pr. 61
199178 St.Petersburg
Russia
email: address@hidden, address@hidden