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[bug #6095] java.awt.geom.QuadCurve2D.solveQuadratic sometimes gives wro
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From: |
nobody |
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Subject: |
[bug #6095] java.awt.geom.QuadCurve2D.solveQuadratic sometimes gives wrong result |
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Date: |
Fri, 24 Oct 2003 10:06:58 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US; rv:1.1a) Gecko/20020610 |
=================== BUG #6095: LATEST MODIFICATIONS ==================
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=6095&group_id=85
Changes by: Sascha Brawer <address@hidden>
Date: Fri 10/24/2003 at 14:06 (GMT)
What | Removed | Added
---------------------------------------------------------------------------
Resolution | None | Later
Assigned to | None | brawer
------------------ Additional Follow-up Comments ----------------------------
This would be fixed by a revised version of solveQuadratic that is derived from
the GNU Scientific Library (GSL). Since GSL is licensed under the GPL, but not
(c) FSF, we'll have to ask the GSL authors for permission. I've sent an e-mail
to the author today, with cc to Mark Wielaard. If the GSL author agrees, I'll
check in my patch.
A revised version of the test case is now in Mauve cvs.
=================== BUG #6095: FULL BUG SNAPSHOT ===================
Submitted by: brawer Project: classpath
Submitted on: Tue 10/21/2003 at 14:27
Severity: 5 - Major Resolution: Later
Assigned to: brawer Status: Open
Platform Version: None
Summary: java.awt.geom.QuadCurve2D.solveQuadratic sometimes gives wrong result
Original Submission: The solveQuadratic method in java.awt.geom.QuadCurve2D
gives the wrong result for the equation 4 * (x^2) = 0. This equation has
exactly one solution, namely x = 0.
Both Sun J2SE 1.4.1_01 (GNU/Linux i386) and Apple JDK 1.3.1 (PowerPC G4) return
the correct result. GNU Classpath however claims that the equation has two
solutions.
A Mauve test case is attached, see checks 8 and 9.
Follow-up Comments
*******************
-------------------------------------------------------
Date: Fri 10/24/2003 at 14:06 By: brawer
This would be fixed by a revised version of solveQuadratic that is derived from
the GNU Scientific Library (GSL). Since GSL is licensed under the GPL, but not
(c) FSF, we'll have to ask the GSL authors for permission. I've sent an e-mail
to the author today, with cc to Mark Wielaard. If the GSL author agrees, I'll
check in my patch.
A revised version of the test case is now in Mauve cvs.
CC list is empty
File Attachments
****************
-------------------------------------------------------
Date: Tue 10/21/2003 at 14:27 Name: solveQuadratic.java Size: 2KB By: brawer
Mauve test case
http://savannah.gnu.org/bugs/download.php?group_id=85&bug_id=6095&bug_file_id=741
For detailed info, follow this link:
http://savannah.gnu.org/bugs/?func=detailbug&bug_id=6095&group_id=85
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