Messages in this thread | | | Date | Fri, 25 May 2001 03:05:00 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: Fwd: Copyright infringement in linux/drivers/usb/serial/keyspan*fw.h |
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On 25 May 2001, Andreas Jaeger wrote:
> We have comments in the code that state how j0 is build, and R0/S0 > come from some expansion: > * Bessel function of the first and second kinds of order zero. > * Method -- j0(x): > * 1. For tiny x, we use j0(x) = 1 - x^2/4 + x^4/64 - ... > * 2. Reduce x to |x| since j0(x)=j0(-x), and > * for x in (0,2) > * j0(x) = 1-z/4+ z^2*R0/S0, where z = x*x; > * (precision: |j0-1+z/4-z^2R0/S0 |<2**-63.67 ) > > Andreas
Sure. However, the question about choosing the polynomials stands. (And no, I'm not proposing to go and bugger glibc folks over that ;-)
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