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Re: SIGN function: signof(num or array of num) [message #70143 is a reply to message #70142]

Tue, 16 March 2010 06:57

Carsten Lechte
Messages: 124
Registered: August 2006

Senior Member

Fï¿½LDY Lajos wrote:
> I think SIGNOF() should not cause an arithmetic error for finite numbers.

I use the expression

(x GT 0) -1* (x LT 0)

to get the sign of e.g.

x = [ -2e4, 5, 0, 1d/0, -1d/0, 0d/0 ]

but it uses 2 comparisons and even a multiplication. Does anyone have
a simpler/faster version? Furthermore, what should the sign of NaN be?

chl

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[Message index]

		Re: SIGN function: signof(num or array of num) By: Kenneth P. Bowman on Tue, 16 March 2010 07:01
		Re: SIGN function: signof(num or array of num) By: Carsten Lechte on Tue, 16 March 2010 06:57
		Re: SIGN function: signof(num or array of num) By: Foldy Lajos on Tue, 16 March 2010 06:31

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