[EMAIL PROTECTED] wrote: > The A&S handbook lists polynomial coefficients for approximation of E1, > the exponential integral. Does anyone know how these coefficients were > derived? Is it a chebyshev polynomial? I want to dynamically compute > these coefficients to the required precision. > > Tim > > > _______________________________________________ > Axiom-developer mailing list > Axiom-developer@nongnu.org > http://lists.nongnu.org/mailman/listinfo/axiom-developer >
Aren't there references in A&S? I don't have my copy handy, but IIRC everything in there was painstakingly documented. In the good old days of expensive scientific computing, finding things that could be computed accurately with as few multiplies and divides as possible was a very big deal. Extra points were awarded for methods that got decent results using the crappy floating point arithmetic most machines had prior to IEEE 754. :) _______________________________________________ Axiom-developer mailing list Axiom-developer@nongnu.org http://lists.nongnu.org/mailman/listinfo/axiom-developer
