Re: [Algorithms] Formula for Damping f times

[Robin G. <rob...@gm...>]

On Sat, Jun 6, 2009 at 2:32 AM, Fabian Giesen<f.g...@49...> wrote:
>
> But since the log is only done on k (which is, presumably, a constant),
> you can just store log(k) directly and do exp(log(k)*t) (with some small
> loss in accuracy that's unlikely to be a problem).

Yes, in theory, but these tables have to be run using a higher number
of bits than normal as they have a large effect in the reconstructed
value. Check out the use of static tables with a second "continuation"
table in "powf.c" from the Cephes single precision library
"single.tgz". Compare it to the simplicity of "exp2f.c".

    http://www.netlib.org/cephes/

- Robin Green.