bugGNU Scientific Library - Bugs: bug #27180, nmsimplex2 failed to converge

 
 

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bug #27180: nmsimplex2 failed to converge

Submitted by:  -Deleted Account- <bjg>
Submitted on:  Wed 05 Aug 2009 04:03:46 PM UTC  
 
Category: Runtime errorSeverity: 4 - Important
Operating System: Status: Fixed
Assigned to: -Deleted Account- <bjg>Open/Closed: Closed
Release: 1.12

Wed 05 Aug 2009 04:19:13 PM UTC, comment #1:

added testcase in 571ad83c226c9ca1f80a68ce5b21a4d3066f2efe
fixed by 8fd1a5b178bc0956b50870d272551b9f3fd2d192

-Deleted Account- <bjg>In charge of this item.
Wed 05 Aug 2009 04:03:46 PM UTC, original submission:

From: "Andrew W. Steiner" <awsteiner@users.sourceforge.net>
To: -unavailable-
Cc:
Subject: [Bug-gsl] Possible bug (or room for improvement) in gsl_mmin_simp2
Date: Mon, 27 Jul 2009 09:22:46 -0400

[1 <text/plain; ISO-8859-1 (7bit)>]
Hello all,

I've been finding that the new simplex algorithm seems to fail
to converge much more frequently than the old one. It took me
awhile to generate a sufficiently portable case which demonstrates
this, but attached is a program which shows that the simplex
minimizer succeeds, but the simplex2 minimizer stalls and gets
stuck (the true minimum is at (1,0,0)).

Unfortunately I haven't yet figured out why it's stalling, but
in the meantime I thought I'd post this code and see if anyone
else has been having similar difficulties. It's a bit of an unusual
function, but it's continuous everywhere and all of the other
minimizers I try happily succeed without complaint.

-Deleted Account- <bjg>In charge of this item.

 

Attached Files
file #18530:  bug-conv.c added by bjg (3KiB - text/x-csrc)

 

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Follow 3 latest changes.

Date Changed By Updated Field Previous Value => Replaced By
Wed 05 Aug 2009 04:19:13 PM UTCbjgOpen/ClosedOpen=>Closed
Wed 05 Aug 2009 04:19:12 PM UTCbjgStatusConfirmed=>Fixed
Wed 05 Aug 2009 04:03:46 PM UTCbjgAttached File-=>Added bug-conv.c, #18530

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