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Re: SIGN function: signof(num or array of num) [message #70134 is a reply to message #70133]

Tue, 16 March 2010 09:17

Ding
Messages: 20
Registered: March 2008

Junior Member

On Mar 16, 3:46 pm, Carsten Lechte <c...@toppoint.de> wrote:
> Ding wrote:
>> IDL> a=[[1,0][-1,0]]
>> IDL> print,signof(a)
>> 1 0
>> -1 0
>
> Still, you should mention under RESTRICTIONS that the
> input must be an integer type:
>
> IDL> a=[[1,0],[-1,0]]
> IDL> print, signof(a)
> 1 0
> -1 0
> % Program caused arithmetic error: Integer divide by 0
> IDL> print, signof(double(a))
> 1 -32768
> -1 -32768
> % Program caused arithmetic error: Floating illegal operand
> IDL> print, signof(complex(a))
> 1 -32768
> -1 -32768
> % Program caused arithmetic error: Floating illegal operand
>
> chl

This is all the information I have, including the !version:

IDL> print,!version
{ x86_64 linux unix linux 6.4 Apr 26 2007 64 64}
IDL> print,a
1 0
-1 0
IDL> print,double(a)
1.0000000 0.0000000
-1.0000000 0.0000000
IDL> print,complex(a)
( 1.00000, 0.00000)( 0.00000, 0.00000)
( -1.00000, 0.00000)( 0.00000, 0.00000)
IDL> print,signof(a)
1 0
-1 0
% Program caused arithmetic error: Integer divide by 0
IDL> print,signof(double(a))
1 0
-1 0
% Program caused arithmetic error: Floating illegal operand
IDL> print,signof(complex(a))
1 0
-1 0
% Program caused arithmetic error: Floating illegal operand
IDL>

Let's compare the version of the result and see if it is IDL or
processor that cause the difference!

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[Message index]

		Re: SIGN function: signof(num or array of num) By: Foldy Lajos on Tue, 16 March 2010 09:41
		Re: SIGN function: signof(num or array of num) By: Carsten Lechte on Tue, 16 March 2010 09:36
		Re: SIGN function: signof(num or array of num) By: Carsten Lechte on Tue, 16 March 2010 09:25
		Re: SIGN function: signof(num or array of num) By: Ding on Tue, 16 March 2010 09:17
		Re: SIGN function: signof(num or array of num) By: Carsten Lechte on Tue, 16 March 2010 08:46
		Re: SIGN function: signof(num or array of num) By: Ding on Tue, 16 March 2010 08:43
		Re: SIGN function: signof(num or array of num) By: Carsten Lechte on Tue, 16 March 2010 08:35
		Re: SIGN function: signof(num or array of num) By: Ding on Tue, 16 March 2010 08:32
		Re: SIGN function: signof(num or array of num) By: H. Evans on Tue, 16 March 2010 07:30

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