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From: | anonymous |
Subject: | [Octave-bug-tracker] [bug #45295] Division by Zero in 2nd derivative of NURBS surface |
Date: | Wed, 10 Jun 2015 12:50:47 +0000 |
User-agent: | Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36 |
URL: <http://savannah.gnu.org/bugs/?45295> Summary: Division by Zero in 2nd derivative of NURBS surface Project: GNU Octave Submitted by: None Submitted on: Mi 10 Jun 2015 12:50:42 UTC Category: Octave Forge Package Severity: 3 - Normal Priority: 5 - Normal Item Group: Incorrect Result Status: None Assigned to: None Originator Name: Sven Originator Email: address@hidden Open/Closed: Open Discussion Lock: Any Release: other Operating System: Any _______________________________________________________ Details: 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. I have attached my example data + the commands that lead to the error. _______________________________________________________ File Attachments: ------------------------------------------------------- Date: Mi 10 Jun 2015 12:50:42 UTC Name: nrb.m Size: 167kB By: None <http://savannah.gnu.org/bugs/download.php?file_id=34194> _______________________________________________________ Reply to this item at: <http://savannah.gnu.org/bugs/?45295> _______________________________________________ Nachricht gesendet von/durch Savannah http://savannah.gnu.org/
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