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Re: Missing Data Programming Contest [message #65997 is a reply to message #65995]

Wed, 08 April 2009 12:11

wlandsman
Messages: 743
Registered: June 2000

Senior Member

> Humm. The only really useful suggestion I've heard so
> far (I forgot my German dictionary today, so I'm not
> sure about Reimar's contribution) is to delete the
> MISSING_VALUE keyword and let the user worry about
> it. Surely this can't be the ONLY suggestion!
>

Well, I'll give the naive answer because I am not certain what the
problem is. If the routine contains a MISSING = missing keyword,
then you can decide whether the user wants a MISSING value or NAN.
(Presumably a missing value rather than NAN is only useful for integer
data.)

do_missing = 0
do_nan = 0
if N_elements(missing) GT 0 then $
if finite(nan) then do_missing = 1 else do_nan = 1

and then you can process data accordingly. For example, to remove
missing values from a variable x

if do_missing then begin
g = where(x NE missing,Ng) ;or use FLOATS_EQUAL for testing
if Ng GT 0 then x = x[g]
endif else if do_nan then x = x[where(finite(x)]

I suspect I am missing something in your question. Or are you just
looking for more speed or elegance? --Wayne

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[Message index]

		Re: Missing Data Programming Contest By: David Fanning on Thu, 09 April 2009 09:34
		Re: Missing Data Programming Contest By: R.Bauer on Thu, 09 April 2009 09:22
		Re: Missing Data Programming Contest By: David Fanning on Thu, 09 April 2009 08:59
		Re: Missing Data Programming Contest By: Homeyer on Thu, 09 April 2009 05:41
		Re: Missing Data Programming Contest By: Carsten Lechte on Thu, 09 April 2009 01:51
		Re: Missing Data Programming Contest By: R.Bauer on Thu, 09 April 2009 01:32
		Re: Missing Data Programming Contest By: Homeyer on Wed, 08 April 2009 16:26
		Re: Missing Data Programming Contest By: Homeyer on Wed, 08 April 2009 16:02
		Re: Missing Data Programming Contest By: wlandsman on Wed, 08 April 2009 12:11
		Re: Missing Data Programming Contest By: David Fanning on Wed, 08 April 2009 11:26
		Re: Missing Data Programming Contest By: R.Bauer on Wed, 08 April 2009 07:27
		Re: Missing Data Programming Contest By: R.Bauer on Wed, 08 April 2009 07:21
		Re: Missing Data Programming Contest By: David Fanning on Wed, 08 April 2009 07:03

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