jlhaferman@l_eld09.icaen.uiowa.edu (Jeffrey Lawrence Haferman) (09/25/90)
I need to calculate the sine and cosine of some complex numbers
where the imaginary part may get as large as 10^3 in magnitude.
Because of the factor exp(y) (where y is the imaginary part
of the given complex number) needed to calculate the cosine (sine),
this problem will exceed the limits of most computers standard
arithmetic libraries.
What I would like is a quick and easy fix -
- perhaps an arbitrary precision (fortran) math library
exhists somewhere?
A little background on the problem:
I'm working with an existing program which needs to
calculate logarithmic derivatives and Ricatti-Bessel
functions using complex arguments, and the complex trig
functions are needed for those calculations, I believe.
I don't know much about the theory underlying the computer
code, and hopefully I won't have to get into it right now.
Jeff Haferman internet: jlhaferman@icaen.uiowa.edu
Department of Mechanical Engineering
University of Iowa
Iowa City IA 52240