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Re: [Help-gsl] Generating the coefficients in lanczos_7_c

From: mail
Subject: Re: [Help-gsl] Generating the coefficients in lanczos_7_c
Date: Fri, 13 May 2005 19:15:26 +0200

On 13 May 2005 at 12:48, Fredrik Johansson wrote:

Date sent:              Fri, 13 May 2005 12:48:15 +0200
From:                   Fredrik Johansson <address@hidden>
To:                     address@hidden
Subject:                [Help-gsl] Generating the coefficients in lanczos_7_c
Send reply to:          Fredrik Johansson <address@hidden>

> Greetings,
> I have written an implementation of the Gamma function for a personal
> project, based on code from the lngamma_lanczos_complex function in
> GSL.
> I am now wondering if anyone could provide an explicit formula for the
> calculation used by lngamma_lanczos_complex. In particular, I am
> interested in the derivation for the coefficients in the table
> lanczos_7_c, as I would like to generate them instead of just copying
> the number literals from the GSL source.
> Presumably the information I need can be obtained from the cited SIAM
> journal article, but it is not easily available for me from where I
> live now.
> Assistance would be much appreciated.
> Fredrik

may be ?

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