bugGNU Scientific Library - Bugs: bug #52351, akima.c array indexing

 
 

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bug #52351: akima.c array indexing

Submitted by:  Patrick Alken <psa>
Submitted on:  Mon 06 Nov 2017 01:51:04 PM UTC  
 
Category:  Runtime error Severity:  3 - Normal
Operating System:  Status:  None
Assigned to:  None Open/Closed:  Open
Release: 

Mon 06 Nov 2017 01:51:04 PM UTC, original submission:

from th =dot= walter42 =at= gmx =dot= de

On the other hand, I think I found the root cause of the misbehavior of the akima algorithm.
It is located in function akima_calc() in the block

if (NE_next == 0.0)
{
tL_ip1 = m[i+1]; /* here '+1' was missing; because after adding, the graph looks much better */
}

All variables related to the next with indices have a '+1' except 'tl_ip1'.
Replacing 'm[i]' by 'm[i+1]' results in a smooth spline curve.

-----------------

sorry for not being exact enough.
I refer to the demo2.c example living in the sub-directory "interpolation".
If the plotutils are available then visualization can be done via

./demo2 | graph -T X

With Kind Regards,
Thomas

Patrick Alken <psa>
Project Administrator

 

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