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Re: How can this assert() ever trigger?

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albert@spenarnc.xs4all.nl (Albert van der Horst) writes:

[...]
> Now on some matrices the assert triggers, meaning that nom is zero.
> How can that ever happen? mon start out as 1. and gets multiplied

[several times]

> with a number that is asserted to be not zero.

Finite precision. Try: 1.*1e-162*1e-162. Equals zero.

-- Alain.

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How can this assert() ever trigger? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-05-10 15:24 +0000
  Re: How can this assert() ever trigger? Peter Otten <__peter__@web.de> - 2014-05-10 17:50 +0200
  Re: How can this assert() ever trigger? Ethan Furman <ethan@stoneleaf.us> - 2014-05-10 08:35 -0700
  Re: How can this assert() ever trigger? Gary Herron <gary.herron@islandtraining.com> - 2014-05-10 08:48 -0700
  Re: How can this assert() ever trigger? Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-05-10 17:56 +0200
    Re: How can this assert() ever trigger? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-05-10 16:39 +0000
  Re: How can this assert() ever trigger? Joseph Martinot-Lagarde <joseph.martinot-lagarde@m4x.org> - 2014-05-12 19:05 +0200
    Re: How can this assert() ever trigger? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-05-13 09:56 +0000
      Re: How can this assert() ever trigger? Joseph Martinot-Lagarde <joseph.martinot-lagarde@m4x.org> - 2014-05-14 01:14 +0200

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