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Re: array dimensions [message #24639 is a reply to message #24591]

Tue, 10 April 2001 07:08

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

"Richard G. French" wrote:
>
> Paul van Delst wrote:
>>
>> IF ( n GT 1 ) THEN SMOOTH( array, n )
>>
>> ?
> That's fine if you want this to be on a single line, but there are
> plenty
> of times when SMOOTH(array, n) is in a plot command, or in part of a
> complex
> expression. I think the argument about rebin is exactly similar - of
> course,
> you can do the checking ahead of time, but who wants to add this check
> for every time you do dynamic smoothing? adds lots of unneeded hair to
> the code. Smoothing by 1 is not the same as dividing by zero. It is like
> convolving with a one-element array, which IDL is perfectly willing to
> do without complaining and dying.

Fair enough. Complaining and dying is a decidedly poor response. I guess it would be nice
to be able to put a

IF ( n LE 1 ) THEN RETURN, array

or

IF ( n LE 1 ) THEN BEGIN
MESSAGE, 'N < or = 1, exiting...'
RETURN, array
ENDIF

as the first executable statement(s) in a smooth.pro, if it existed for users to meddle
with. I just checked the IDL documentation and it doesn't state that n=1 is invalid. In
fact, it is implicitly valid since it is an odd number. So, wouldn't the problem with
SMOOTH when n=1 be a bug ... that RSI should fix?

paulv

--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
Fax:(301)763-8545 And drinking largely sobers us again.
paul.vandelst@noaa.gov Alexander Pope.

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[Message index]

		array dimensions By: francesco.spada on Sat, 07 April 2001 04:16
		Re: array dimensions By: davidf on Tue, 10 April 2001 07:21
		Re: array dimensions By: Paul van Delst on Tue, 10 April 2001 07:08
		Re: array dimensions By: Carsten Dominik on Tue, 10 April 2001 07:06
		Re: array dimensions By: Martin Schultz on Tue, 10 April 2001 03:42
		Re: array dimensions By: Martin Schultz on Tue, 10 April 2001 03:37
		Re: array dimensions By: Richard French on Mon, 09 April 2001 20:29
		Re: array dimensions By: m.hadfield on Mon, 09 April 2001 14:07
		Re: array dimensions By: John-David T. Smith on Mon, 09 April 2001 11:09
		Re: array dimensions By: Carsten Dominik on Mon, 09 April 2001 10:57
		Re: array dimensions By: Paul van Delst on Mon, 09 April 2001 09:49
		Re: array dimensions By: John-David T. Smith on Mon, 09 April 2001 09:25
		Re: array dimensions By: davidf on Mon, 09 April 2001 08:51
		Re: array dimensions By: Martin Schultz on Mon, 09 April 2001 08:18
		Re: array dimensions By: davidf on Mon, 09 April 2001 06:49

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