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| Requred Number of Nodes in Akima http://forum.alglib.net/viewtopic.php?f=2&t=851 |
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| Author: | MichaelScheffenacker [ Wed May 22, 2013 3:21 pm ] |
| Post subject: | Requred Number of Nodes in Akima |
Regarding to your manual (VB6) 5 nodes are required for a Akima spline interpolant; regarding to literature 4 should be sufficient. Is it possible to run the alglib Akima with just 4 nodes? Code: ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'This subroutine builds Akima spline interpolant INPUT PARAMETERS: X - spline nodes, array[0..N-1] Y - function values, array[0..N-1] N - points count, N>=5 |
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| Author: | Sergey.Bochkanov [ Thu May 23, 2013 5:58 am ] |
| Post subject: | Re: Requred Number of Nodes in Akima |
I've studied algorithm one more time, and - yes, it is possible. Akima spline with N=4 will become parabolic spline (or something like this), and everything should work. BTW, newer versions of ALGLIB will throw exception for N=4 so you will have to comment out line which performs check for N being >=5. |
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| Author: | Sergey.Bochkanov [ Thu May 23, 2013 6:01 am ] |
| Post subject: | Re: Requred Number of Nodes in Akima |
BTW, I've added support for N=2...4 to issues tracker, so it will appear in 3.8.0 |
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