Re: [Help-gsl] Slight documentation error

[David Zaslavsky]

Sure, how about this:

  Given a set of x coordinates *x_1,...,x_m* and a set of y coordinates
*y_1,...,y_n*, each in increasing order,

That should replace the following on the "2D introduction to interpolation"
page (
https://www.gnu.org/software/gsl/manual/html_node/2D-Introduction-to-Interpolation.html
):

  Given two sets of equally spaced grid points: *x_1,...,x_m* with
spacing *\delta
x*, and *y_1,...,y_n* with spacing *\delta y*,

The rest of the description ("...plus a set of function values....") can
stay as is.

:) David

On Mon, Feb 8, 2016 at 8:28 PM Patrick Alken <address@hidden> wrote:

> Hi David,
>
>    Do you think you could write a new sentence or two to describe more
> accurately what the manual should say? I'm still a little confused :-) I
> can then just paste the new text into that section.
>
> Patrick
>
> On 02/08/2016 12:17 PM, David Zaslavsky wrote:
> > Hi,
> >
> > I tried sending this out to gsl-discuss a while ago but it was never
> > approved, so I'm trying again and cc'ing it to help-gsl just in case.
> >
> > Someone pointed out that the documentation for GSL 2.1 says that the 2D
> > interpolation requires equally spaced grids, but it actually doesn't. Or
> > to be more precise, it doesn't require that x[i] - x[i-1] == x[i+1] -
> > x[i] (and likewise for y), which is what most people would take "equally
> > spaced" to mean (I think). Could that be updated?
> >
> > I can try to prepare a patch against the latest git revision, if that
> > would help.
> >
> > reference: https://github.com/diazona/interp2d/issues/8
> >
> > :) David
>
>