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[Octave-bug-tracker] [bug #35178] griddata: cubic interpolation not yet
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From: |
Rik |
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Subject: |
[Octave-bug-tracker] [bug #35178] griddata: cubic interpolation not yet implemented |
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Date: |
Tue, 14 Apr 2020 11:05:36 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko |
Follow-up Comment #10, bug #35178 (project octave):
How many boundary conditions possibilities are there? It doesn't seem to me
that there are that many choices.
Take a look at www.maths.lth.se/na/courses/FMN081/FMN081-06/lecture11.pdf,
which I've attached. They define just 4 different end conditions including
"natural" and "not-a-knot" which is what they claim Matlab uses. The first
part of the algorithm for interior points might always be the same and it is
only adjustment for the boundary conditions which changes with "natural" and
"cubic".
(file #48834)
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Additional Item Attachment:
File name: lecture11.pdf Size:110 KB
<https://savannah.gnu.org/file/lecture11.pdf?file_id=48834>
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