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From: | Michael Creel |
Subject: | Re: 0.3*3 == 0.9? |
Date: | Wed, 25 Aug 2010 16:31:57 +0200 |
2010/8/25 Jordi Gutiérrez Hermoso <address@hidden>:
Oops, sorry, I hit the "send" button too soon.> On 25 August 2010 09:13, Michael Creel <address@hidden> wrote:
>> octave:1> 0.3*2 == 0.6
>> ans = 1
>> octave:2> 0.3*3 == 0.9
>> ans = 0
>> octave:3>
>
> http://docs.sun.com/source/806-3568/ncg_goldberg.html
Anyways, yes, this is completely normal. 0.3 has an infinite binary
expansion because its denominator has factors other than 2, so you'll
get a rounding error. Use something like abs(0.3*3 - 0.9) < 10*eps
instead or whatever seems like an appropriate approximation.
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