cc wrote:

> say I "would have to compute the Bessel functions (or whatever)
> numerically," do you mean something like for example taking a sum of some
> formula as n goes from 1 to something aribitrarily large?  Anyway it's

Yes, someting like that. The zeroth Bessel function is like cos,
just the factorials in the denominator are squared, and the
powers are taken from x^2/4 instead of x. But usually one uses
a more complicated, but faster and preciser formula (which is
different for different values of the argument).

A pointer to a numerics site (which is considered doubtful
by professionals, but good enough for simple stuff) can be found
near the bottom of http://math.jpl.nasa.gov/nr/nr.html .

Ralf

Post a reply to this message