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Re: SIGN function: signof(num or array of num) [message #70144 is a reply to message #70143]

Tue, 16 March 2010 06:31

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Tue, 16 Mar 2010, Ding wrote:

> Dear IDL users,
>
> I cannot find the SIGN function in IDL procedures, but one in
> Solarsoft ssw/maths/ SIGN which occupy the name, but different
> purpose( sign(a)*b). so I wrote the SIGNOF() function which is to get
> the sign of a number or array,
>
> Hopefully I am not repeating someone' work! you are welcome to
> comments!
>

> return, fix(abs(input)/input)

IDL> input=0 & help, fix(abs(input)/input)
<Expression> INT = 0
% Program caused arithmetic error: Integer divide by 0

I think SIGNOF() should not cause an arithmetic error for finite numbers.

regards,
lajos

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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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