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Re: IDL removes dimensions of size 1 automatically [message #41179 is a reply to message #41178]

Sun, 26 September 2004 15:46

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Benjamin Hornberger wrote:
> I had a hard time finding a bug which came from IDL's behaviour to
> remove dimensions of size 1 automatically sometimes.
>
> ...
>
> I found this very annoying. Does anyone know more about it? Why is it
> like that?

Since others have already responded on these points I will be brief:

So do I.
No, I think you know as much as anyone.
Why indeed?

> In which situations will IDL do that?

I think the only answer you can rely on is "Whenever you don't want it to".

Seriously, you can *create* arrays with a trailing dimension of size 1
and you can pass them in and out of routines, but beyond that you should
assume that IDL will lose the trailing dimension.

I support the idea of a compiler option to turn this behaviour off. I
suspect, however, that implementing it would open up a Pandora's box of
worms, as the saying goes.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: IDL removes dimensions of size 1 automatically By: Mark Hadfield on Wed, 29 September 2004 17:07
		Re: IDL removes dimensions of size 1 automatically By: David Fanning on Wed, 29 September 2004 11:46
		Re: IDL removes dimensions of size 1 automatically By: R.Bauer on Wed, 29 September 2004 08:01
		Re: IDL removes dimensions of size 1 automatically By: David Fanning on Mon, 27 September 2004 00:20
		Re: IDL removes dimensions of size 1 automatically By: Mark Hadfield on Sun, 26 September 2004 15:46
		Re: IDL removes dimensions of size 1 automatically By: R.Bauer on Sun, 26 September 2004 01:36
		Re: IDL removes dimensions of size 1 automatically By: btt on Fri, 24 September 2004 13:16
		Re: IDL removes dimensions of size 1 automatically By: Paul Van Delst[1] on Fri, 24 September 2004 11:14
		Re: IDL removes dimensions of size 1 automatically By: R.Bauer on Sun, 03 October 2004 00:14

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