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Re: IDL 8.0 compile_opt changes [message #69115 is a reply to message #69114]

Sun, 20 December 2009 21:33

ddegraff
Messages: 1
Registered: December 2009

Junior Member

On Dec 19, 2:11 pm, Chris Torrence <gorth...@gmail.com> wrote:

>
> Another point of information: We are adding a lot of new language
> features to IDL 8.0. Things like a new "foreach" operator, negative
> array subscripting a[0:-1],
>
> More thoughts? More eggnog?

No! negative index is a Bad Idea!

z= where(bad ne 0)
if z[0] ne -1 then begin
lots of stuff
endif

I have a lot of code like this, which would no longer be valid if -1
were a legal array index. I could go thought and include a count in
the where function but that's a lot more work than fixing all the ().
Actually I was surprised that you could still use () for arrays. I
tell my students to always use [].

david

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[Message index]

		Re: IDL 8.0 compile_opt changes By: chris_torrence@NOSPAM on Mon, 21 December 2009 09:23
		Re: IDL 8.0 compile_opt changes By: H. Evans on Mon, 21 December 2009 06:43
		Re: IDL 8.0 compile_opt changes By: Foldy Lajos on Mon, 21 December 2009 05:52
		Re: IDL 8.0 compile_opt changes By: H. Evans on Mon, 21 December 2009 05:15
		Re: IDL 8.0 compile_opt changes By: Wout De Nolf on Mon, 21 December 2009 03:00
		Re: IDL 8.0 compile_opt changes By: penteado on Sun, 20 December 2009 22:16
		Re: IDL 8.0 compile_opt changes By: ddegraff on Sun, 20 December 2009 21:33
		Re: IDL 8.0 compile_opt changes By: wallabadah on Sun, 20 December 2009 17:10
		Re: IDL 8.0 compile_opt changes By: Robbie on Sun, 20 December 2009 03:15
		Re: IDL 8.0 compile_opt changes By: penteado on Sat, 19 December 2009 12:32
		Re: IDL 8.0 compile_opt changes By: chris_torrence@NOSPAM on Sat, 19 December 2009 11:11
		Re: IDL 8.0 compile_opt changes By: wlandsman on Sat, 19 December 2009 09:55
		Re: IDL 8.0 compile_opt changes By: H. Evans on Sat, 19 December 2009 09:45
		Re: IDL 8.0 compile_opt changes By: penteado on Sat, 19 December 2009 08:16
		Re: IDL 8.0 compile_opt changes By: M. Katz on Sat, 19 December 2009 08:13
		Re: IDL 8.0 compile_opt changes By: H. Evans on Sat, 19 December 2009 02:19
		Re: IDL 8.0 compile_opt changes By: H. Evans on Sat, 19 December 2009 02:00
		Re: IDL 8.0 compile_opt changes By: penteado on Fri, 18 December 2009 18:39
		Re: IDL 8.0 compile_opt changes By: wlandsman on Fri, 18 December 2009 18:26
		Re: IDL 8.0 compile_opt changes By: David Fanning on Fri, 18 December 2009 14:33
		Re: IDL 8.0 compile_opt changes By: Mark Piper on Tue, 29 December 2009 07:26
		Re: IDL 8.0 compile_opt changes By: markb77 on Wed, 23 December 2009 19:40

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