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Re: [Bug-gsl] DIFF in CSPLINE Interpolation bug !?
From: |
Rhys Ulerich |
Subject: |
Re: [Bug-gsl] DIFF in CSPLINE Interpolation bug !? |
Date: |
Wed, 30 Oct 2013 15:28:24 -0500 |
> I did a test of CSPLINE interpolation from the GSL package and compared the
> test (interp.c) file given in the doc/examples/ directory of the native GSL
> package
> to the XMGRACE interpolation function and found that they differ
> significantly.
> here i attach a pdf file which shows this difference.
What does XMGRACE use for end conditions on the cspline? I notice
from your PDF that the discrepancies seem to "originate" in the
derivatives at the ends of the interval. GSL's end conditions are
documented here:
http://www.gnu.org/software/gsl/manual/html_node/Interpolation-Types.html#Interpolation-Types
- Rhys