Re: test sign of signed zero?

[Fotios Kasolis]

-----Original Message----- 
From: Eric Chassande-Mottin
Sent: Sunday, December 19, 2010 2:49 PM
To: address@hidden
Subject: test sign of signed zero?



hi,

I'd like to test the sign of a variable that can be a signed zero.

octave:1> a=-0
a = -0
octave:2> sign(a)
ans = 0

sign() does not work. any suggestions ?

thanks,
e
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The only idea that I have (after trying some conversions to binary but the 
function dec2base works with positive numbers only) is the following
octave.exe:38> a = -0
a = -0
octave.exe:39> b = num2str(a)
b = -0
octave.exe:40> findstr (b, "-")
ans =  1
octave.exe:41> findstr (b, "whatever")
ans = [](0x0)

and then use isempty to decide the case! Not very clever but does the 
desired. Before doing this, think how necessary is it cause it seems strange 
to want to find the sign of a zero.

Enjoy
Fotios