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Re: reverse problem [message #46179 is a reply to message #46053]

Fri, 04 November 2005 09:04

news.qwest.net
Messages: 137
Registered: September 2005

Senior Member

<liamgumley@gmail.com> wrote in message
news:1131118887.329659.247860@g43g2000cwa.googlegroups.com.. .
> Bob,
>
> Is it possible that you have another file named reverse.pro somewhere
> in your IDL path? Here's one way you can find which version of
> reverse.pro is being compiled:
>
> IDL> doc_library, 'reverse'
> ----- Documentation for /Applications/rsi/idl_6.1/lib/reverse.pro -----
>
> Cheers,
> Liam.
> Practical IDL Programming
> http://www.gumley.com/

Good tip Liam. The only "reverse" function is the RSI one.

As Paolo points out, the routine is returning the keyword value,
replicated to the size of the input array. Neat!
So, it is treating reverse as a single element array, then accessing
it with the input array as an index (which exceeds the "reverse" array
size, and by IDL's default rule, it replicates the last number).

example:
IDL> x = 1

IDL> print, x(findgen(10))

1 1 1 1 1 1 1 1 1 1

But the really really strange thing is that, as I showed in my original
post,
that the problem was persistent. After running the routine, the keyword
"reverse"
escaped the local scope of the routine, and came to main level (and thus
overwriting the
reverse function at the main level). Of course, this is how keywords are
supposed to work,
but it was kind of a surprise.

Cheers,
bob

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[Message index]

		reverse problem By: news.qwest.net on Thu, 03 November 2005 16:24
		Re: reverse problem By: David Fanning on Fri, 04 November 2005 14:31
		Re: reverse problem By: savoie on Fri, 04 November 2005 14:03
		Re: reverse problem By: news.qwest.net on Fri, 04 November 2005 13:16
		Re: reverse problem By: David Fanning on Fri, 04 November 2005 12:27
		Re: reverse problem By: news.qwest.net on Fri, 04 November 2005 10:42
		Re: reverse problem By: David Fanning on Fri, 04 November 2005 09:22
		Re: reverse problem By: news.qwest.net on Fri, 04 November 2005 09:04
		Re: reverse problem By: MarioIncandenza on Fri, 04 November 2005 08:59
		Re: reverse problem By: Paolo Grigis on Fri, 04 November 2005 08:25
		Re: reverse problem By: liamgumley on Fri, 04 November 2005 07:41
		Re: reverse problem By: news.qwest.net on Fri, 04 November 2005 07:38

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