bugGNU Octave - Bugs: bug #35553, Assertion `last_time >= 0.0...

 
 

bug #35553: Assertion `last_time >= 0.0 && last_time <= t' failed

Submitted by:  None
Submitted on:  Fri 17 Feb 2012 03:15:03 PM UTC  
 
Category: InterpreterSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Other
Status: Need InfoAssigned to: None
Originator Name: Originator Email: -unavailable-
Open/Closed: ClosedRelease: 3.6.0
Operating System: GNU/Linux

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Wed 14 May 2014 09:08:02 PM UTC, comment #2:

This report is two years old. If we could get some sample code from the original reporter that reproduces the problem it might be possible to debug this. Otherwise, it probably isn't possible since the Octave developers aren't experiencing this issue.

One possibility may be to compile Octave from scratch with the --enable-float-truncate option. It seems, from the reporter's results, that more than double precision was being used in the subtraction operation.

Rik <rik5>
Project Administrator
Thu 08 Mar 2012 11:22:09 PM UTC, comment #1:

Daniel, do you have any comment on this?

Jordi GutiƩrrez Hermoso <jordigh>
Project Administrator
Fri 17 Feb 2012 03:15:03 PM UTC, original submission:

Profiler frequently crushes on our private program.

We have make some modifications to source code to refine the problem better:

That results in the following output (note that the assertion failure disappeared):

We hope the data above show that the problem is related to long double -> double conversion. Please note that delta has not many 1's in binary representation, which hits that it is related to excess of long double over double precision. Please note that the effective value of t changes after invocation of printf.

Our versions:
octave-3.6.0 (./configure && make && ./run-octave -q our-private-program);
Gentoo Linux 2.6.39-gentoo-r3 i686 Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz GenuineIntel GNU/Linux

Anonymous

 

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  • -unavailable- added by jordigh (Posted a comment)
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    Follow 5 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 28 Dec 2014 01:48:53 AM UTCrik5Open/ClosedOpen=>Closed
    Wed 14 May 2014 09:08:08 PM UTCrik5StatusNone=>Need Info
    Thu 10 Oct 2013 07:20:52 PM UTCrik5Item GroupSegfault, Bus Error, etc.=>Other
    Thu 08 Mar 2012 11:22:09 PM UTCjordighCarbon-Copy-=>Added "daniel kraft"
      Carbon-Copy-=>Added

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