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Re: printing an array from pointers [message #48182 is a reply to message #48125]

Wed, 29 March 2006 08:29

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

David Fanning wrote:
> Paul Van Delst writes:
>
>
>> Note: all the above typed off top of head, so no guarantees. Test. Especially the
>> concatenate stuff. I can never remember how many groups of [[][]]'s to use for multi-D arrays.
>
>
> One more for every dimension you are trying to concatenate:
>
> As rows: t = [a, b] ; extra = 0
> As cols: t = [ [a], [b] ] ; extra = 1
> As frames: t = [ [[a]], [[b]] ] ; extra = 2
> etc. ; extra = etc

No "etc" allowed:

IDL> a=4
IDL> b=7
IDL> t = [a, b]
IDL> help, t
T INT = Array[2]
IDL> t = [ [a], [b] ]
IDL> help, t
T INT = Array[1, 2]
IDL> t = [ [[a]], [[b]] ]
IDL> help, t
T INT = Array[1, 1, 2]
IDL> t = [ [[[a]]], [[[b]]] ]

t = [ [[[a]]], [[[b]]] ]
^
% Only three levels of variable concatenation are allowed.

I've always found this behaviour confusing. Why special case for only three levels?

paulv

--
Paul van Delst
CIMSS @ NOAA/NCEP/EMC

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[Message index]

		printing an array from pointers By: bressert@gmail.com on Tue, 28 March 2006 00:12
		Re: printing an array from pointers By: David Fanning on Wed, 29 March 2006 08:43
		Re: printing an array from pointers By: Paul Van Delst[1] on Wed, 29 March 2006 08:29
		Re: printing an array from pointers By: David Fanning on Wed, 29 March 2006 08:14
		Re: printing an array from pointers By: Paul Van Delst[1] on Wed, 29 March 2006 08:06

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