bugGNU Octave - Bugs: bug #53319, tests: 'test tfqmr.m' fails about...


bug #53319: tests: 'test tfqmr.m' fails about 5% of the time

Submitted by:  Mike Miller <mtmiller>
Submitted on:  Sun 11 Mar 2018 01:01:51 AM UTC  
Category: Test SuiteSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Inaccurate Result
Status: Patch SubmittedAssigned to: None
Originator Name: Open/Closed: Open
Release: devOperating System: GNU/Linux

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Fri 16 Mar 2018 03:19:14 PM UTC, comment #2:

It is not clear to me what was the purpose of such a test. In the attached patch I removed the randomness and tested the Jacobi preconditioner.

(file #43571)

Marco Caliari <caliari>
Project Member
Sun 11 Mar 2018 01:09:01 AM UTC, comment #1:

this is likely the same issue as bug #53258

the test is checking the error but the actual
convergence check is probably on the residual.

cristiano, can you confirm this?

Carlo de Falco <cdf>
Project Member
Sun 11 Mar 2018 01:01:51 AM UTC, original submission:

Test #4 in the newly added function file tfqmr.m fails on its random input about 5% of the time (about 4-6 times out of 100).


The largest absolute error I have seen so far is 1.6043e-07 out of a few thousand trials.

Cc: cdf, cristianodorigo

Mike Miller <mtmiller>
Project Administrator


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Attach File(s):

Attached Files
file #43571:  tfqmr.diff added by caliari (1KiB - application/x-tex)


Depends on the following items

   bug dependencies.

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
    Fri 16 Mar 2018 03:19:14 PM UTCcaliariAttached File-=>Added tfqmr.diff, #43571
      StatusNone=>Patch Submitted
    Sun 11 Mar 2018 01:10:38 AM UTCcdfDependencies-=>Depends on bugs #53258
    Sun 11 Mar 2018 01:01:51 AM UTCmtmillerCarbon-Copy-=>Added cdf
      Carbon-Copy-=>Added cristianodorigo

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