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[Octave-bug-tracker] [bug #40647] Matrix addition error
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From: |
Mike Miller |
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Subject: |
[Octave-bug-tracker] [bug #40647] Matrix addition error |
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Date: |
Wed, 20 Nov 2013 15:47:55 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20100101 Firefox/17.0 |
Update of bug #40647 (project octave):
Status: None => Invalid
Open/Closed: Open => Closed
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Follow-up Comment #1:
This is a simple case of machine precision overrun. Please understand that
numerical values in Octave are double-precision floating point by default,
which limits the range of significant digits that can be represented.
octave:1> d = [1e-12, 1e-19];
octave:2> d < eps
ans =
0 1
octave:3> 0 + d - 0
ans =
1.0001e-12 1.0000e-19
octave:4> 1 + d - 1
ans =
1.0001e-12 0.0000e+00
octave:5> 1e5 + d - 1e5
ans =
0 0
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Reply to this item at:
<http://savannah.gnu.org/bugs/?40647>
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