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[Octave-bug-tracker] [bug #30742] Function rem returns incorrect result
From: |
Ian Gralinski |
Subject: |
[Octave-bug-tracker] [bug #30742] Function rem returns incorrect result for certain inputs |
Date: |
Wed, 11 Aug 2010 06:01:16 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8 |
URL:
<http://savannah.gnu.org/bugs/?30742>
Summary: Function rem returns incorrect result for certain
inputs
Project: GNU Octave
Submitted by: iang
Submitted on: Wed 11 Aug 2010 04:01:15 PM EST
Category: None
Severity: 3 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name: Ian G
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 3.2.3
Operating System: GNU/Linux
_______________________________________________________
Details:
Octave Version: 3.2.3
Configured for "x86_64-pc-linux-gnu"
Running Ubuntu 10.04 64-bit
The function rem seems to produce incorrect results for a few different input
cases. The following all produce incorrect results:
octave:24> rem(2e-5,0.1e-5)
ans = 3.3881e-21
octave:25> rem(3e-5,0.1e-5)
ans = 3.3881e-21
octave:26> rem(5e-5,0.1e-5)
ans = 6.7763e-21
octave:27> rem(8e-5,0.1e-5)
ans = 1.3553e-20
octave:28> rem(9e-5,0.1e-5)
ans = 1.3553e-20
octave:29> rem(9e-5,0.1e-6)
ans = 1.3553e-20
(All these should give the answer 0)
It seems to be something specific to the size of the input arguments, because
the following produce the correct result:
octave:32> rem(2e5,0.1e5)
ans = 0
octave:33> rem(2e15,0.1e15)
ans = 0
octave:34> rem(2e-15,0.1e-15)
ans = 0
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?30742>
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- [Octave-bug-tracker] [bug #30742] Function rem returns incorrect result for certain inputs,
Ian Gralinski <=