Re: [Help-gsl] GSL1.15: interp.c: 150: ERROR: interpolation error

[CRUZ-CAVALCANTI, Yanna]

Hello again,

I understand this change is an improvement to gsl, but for now I would Just 
like to make my code work. Although, when I change the code interp.c back to 
its ancient state is like the change is never saved, even if I saved it. Am I 
allowed to do that, that is, change this code?

Thank you for the help.

Yanna

-----Message d'origine-----
De : Rhys Ulerich [mailto:address@hidden 
Envoyé : jeudi 2 mai 2013 14:13
À : CRUZ-CAVALCANTI, Yanna
Cc : GSL Help Mailing List
Objet : Re: [Help-gsl] GSL1.15: interp.c: 150: ERROR: interpolation error

>   if (x < interp->xmin || x > interp->xmax)
>     {
>       GSL_ERROR_VAL("interpolation error", GSL_EDOM, GSL_NAN);
>     }

That is exactly the line to which I was referring.  If you are
extrapolating using the interpolation routines (x < xmin || x > xmax),
you get an "interpolation error" from the line in your original bug
report.

The changeset I mentioned was made because accidentally extrapolating
when you meant to interpolate is wildly dangerous.  I suspect your
code has been extrapolating all these years, and it is this recent
defensive fix that now causes it to report an error.

- Rhys

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