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Re: Making some minor contributions to GSL
On Tue, 2004-01-13 at 17:57, linas@austin.ibm.com wrote:
> The only "deficiency" is that the GSL implementation generates
> a "domain error" when gsl_sf_psi_n (1,x) is called with
> negative x. The psi's should be perfectly well defined
> for negative, non-integer x's.
It might take me a while to get around to that. I don't think
I ever found a good way, or at least not one that I understood.
> Another minor suggestion/comment: It would be nice to have
> a function that returns Riemann zeta -1, which provides better
> accuracy for the intermediate/larger values values of the argument.
Now in CVS. The new functions are
gsl_sf_zetam1_e(double s, gsl_sf_result * r);
gsl_sf_zetam1_int_e(int n, gsl_sf_result * r);
along with the corresponding non-error-reporting versions.
This was a good suggestion. I missed
it the first time around.
Thanks.
--
Gerard Jungman <jungman@lanl.gov>
Los Alamos National Laboratory