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Re: Passing zero as a Parameter/ NOT KEYWORD_SET [message #16040]

Wed, 30 June 1999 00:00

J.D. Smith
Messages: 214
Registered: August 1996

Senior Member

"R.Bauer" wrote:
>
> Martin Schultz wrote:
>
>> Martin Schultz wrote
>>
>> and D. Fanning, R. Bauer and J.D. Smith replied
>>
>> [...]
>>
>> oh well! Just when I for once thought I knew IDL ;-(
>> (1) I confess: I confused IF with KEYWORD_SET. It is still sometimes
>> enstranging that
>> IF (2) THEN PRINT,'TRUE'
>> will not print anything...
>
> Did you know that's
>
> if (3) then print,'true'
>
> will print 'true'
>
> All odd number gives true.
>

For non-floating numbers, only the least significant bit is examined.
Note that if (-1) also gives true. For floating numbers, only 0.0 is
false.

JD

--
J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
304 Space Sciences Bldg. |*| FAX: (607) 255-5875
Ithaca, NY 14853 |*|

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[Message index]

		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Vapuser on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Martin Schultz on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Liam Gumley on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Wed, 30 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Pavel Romashkin on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Martin Schultz on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: R.Bauer on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: davidf on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: J.D. Smith on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Andy Sowter on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Tue, 29 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Grady Daub on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: Grady Daub on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: philaldis on Mon, 28 June 1999 00:00
		Re: Passing zero as a Parameter/ NOT KEYWORD_SET By: luthi on Mon, 28 June 1999 00:00

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