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

 
 

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bug #27180: nmsimplex2 failed to converge

Submitter:  -Deleted Account- <bjg>
Submitted:  Wed 05 Aug 2009 04:03:46 PM UTC
   
 
Category:  Runtime error Severity:  4 - Important
Operating System:  Status:  Fixed
Assigned to:  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>
Wed 05 Aug 2009 04:03:46 PM UTC, original submission:  

From: "Andrew W. Steiner" <awsteiner@users.sourceforge.net>
To: -email is 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>

 

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

 

Depends on the following items: None found

Items that depend on this one: None found

 

CC list is empty

 

Follow 3 latest changes.

Date Changed by Updated Field Previous Value => Replaced by
2009-08-05 bjg Open/ClosedOpen Closed
2009-08-05 bjg StatusConfirmed Fixed
2009-08-05 bjg Attached File- Added bug-conv.c, #18530

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