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floating point precision question

From: Piotr Isajew
Subject: floating point precision question
Date: Tue, 18 Jan 2011 13:04:39 +0100
User-agent: Mutt/1.5.20 (2009-06-14)


I've been trying to use Octave (3.2.4) for some very simple
computations, and noticed a strange behaviour when
incrementing/comparing floating point numbers. In short:

octave:150> 0.15 == (0.10 + 0.05)
ans = 0


An even better test is:

octave:1> A=0.15
A =  0.15000
octave:2> B=(0.10+0.05)
B =  0.15000
octave:3> A==B
ans = 0
octave:4> save /tmp/test A B
octave:5> A==B
ans = 0
octave:6> load /tmp/test A B
octave:7> A==B
ans =  1

Is there any setting I could use to obtain better precision here?

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