GNU Octave - Bugs: bug #45295, Division by Zero in 2nd derivative...
bug #45295: Division by Zero in 2nd derivative of NURBS surface
Submitter: | None | ||
Submitted: | Wed 10 Jun 2015 12:50:42 PM UTC | ||
Category: | Octave Package | Severity: | 3 - Normal |
Priority: | 5 - Normal | Item Group: | Incorrect Result |
Status: | None | Assigned to: | cdf |
Originator Name: | Sven | Originator Email: | -email is unavailable- |
Open/Closed: | Closed | Release: | other |
Operating System: | Any | Fixed Release: | None |
Planned Release: | None |
Discussion locked!
Jump to the original submission
Fri 02 Oct 2015 04:07:29 PM UTC, comment #7: |
Carlo de Falco <cdf> |
Mon 15 Jun 2015 01:36:27 PM UTC, comment #6: Hi,
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Sven <sven> |
Mon 15 Jun 2015 12:13:53 PM UTC, comment #5: Hi Sven,
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Anonymous |
Mon 15 Jun 2015 11:43:25 AM UTC, comment #4: Hi,
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Carlo de Falco <cdf> |
Mon 15 Jun 2015 10:34:20 AM UTC, comment #3: Hi Carlo,
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Sven <sven> |
Mon 15 Jun 2015 10:23:06 AM UTC, comment #2: Hi,
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Carlo de Falco <cdf> |
Mon 15 Jun 2015 09:18:01 AM UTC, comment #1: This is probably related to computing the second derivatives in a surface that is not smooth enough, due to knot repetitions.
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Anonymous |
Wed 10 Jun 2015 12:50:42 PM UTC, original submission:
When I try to calculate the 2nd derivatives (Hessian) of my NURBS surface, I get several divisions by Zero, that happen in bspderiv (the difference of the subtracted knots is zero). This results in several (+-) Inf and NaN entries in the Hessian.
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Anonymous |
Depends on the following items: None found
Items that depend on this one: None found
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Follow 5 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2015-10-02 | cdf | Open/Closed | Open | Closed | |
Discussion Lock | None | Locked | |||
2015-06-12 | cdf | Assigned to | None | cdf | |
Carbon-Copy | - | Added -email is unavailable- | |||
2015-06-10 | None | Attached File | - | Added nrb.m, #34194 |
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Corresponding source code
Rafa, is this issue fixed in the new release of NURBS?
Can I close the bug?
c.