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[newbie] unexpected behaviour for x^x

From: Jean Dubois
Subject: [newbie] unexpected behaviour for x^x
Date: Fri, 12 Dec 2014 13:16:55 +0100

I was surprised to found out that when I calculated x^x with octave,
using floats which
approach zero I get two different results depending on the direction
in which zero is approached, this is what I mean:
octave:1> 0.001^0.001
ans =  0.99312

octave:2> -0.001^-0.001
ans = -1.0069

For real numbers calculating this limit algebraically gives 1
(independent of the direction). What's the cause of this?


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