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Re: [Bug-gsl] Numerical differentiation documentation out of date?

From: Patrick Alken
Subject: Re: [Bug-gsl] Numerical differentiation documentation out of date?
Date: Thu, 18 Sep 2008 10:26:55 -0600
User-agent: Mutt/1.5.17+20080114 (2008-01-14)

It appears that the gsl_diff_* functions may be deprecated.
The functions you want are in deriv/deriv.c not diff/diff.c.

The function gsl_deriv_central matches up with the documentation.
gsl_diff_central does not appear to be documented at all though
its still in the tree.

On Wed, Sep 17, 2008 at 10:53:47PM -0400, Liam Healy wrote:
> The documentation for the numerical differentiation functions
> gsl_deriv_central, gsl_deriv_forward, gsl_deriv_backward all show 5
> arguments, e.g.
> int gsl_deriv_central (const gsl_function * f, double x, double h,
> double * result, double * abserr)
> and explicitly mention a step variable h in the description.  However
> diff/diff.h and diff/diff.c show no such argument, having only 4
> total:
> int gsl_diff_central (const gsl_function *f,
>                       double x,
>                       double *result, double *abserr);
> etc.
> It appears the functions were changed but the documentation was not,
> because I think old versions of the library had the step as an
> argument.  Can the documentation (including the description) be
> updated to reflect the current function?
> Thank you.
> Liam
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