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Re: Finding if a structure tag name is defined? [message #36703 is a reply to message #36702]

Tue, 14 October 2003 09:34

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

wmc@bas.ac.uk wrote:

> I want to know if a given keyword has been passed down via _extra, so
> I said "if (n_elements(e.c_linestyle) ne 0)" which of course doesn't
> work because if it isn't there you can't say e.linestyle (bring on
> perl...). I can use tag names to get all the tags, then search through
> for a match, but that seems silly and ugly. What is the correct way
> to find if a given structure has a certain tag in it? (And why
> couldn't I find the answer buried within DF's site ;-)?
>
> -W.
>

I often use is_tag to determine if a tag is in a structure

; PURPOSE:
; Test if tagname is defined
;
; CATEGORY:
; PROG_TOOLS/STRUCTURES
;
; CALLING SEQUENCE:
; Result=is_tag(structure,tagname)

http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/is_tag_dbase.pro.html

regards

Reimar

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email: R.Bauer@fz-juelich.de
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[Message index]

		Re: Finding if a structure tag name is defined? By: mvukovic on Wed, 15 October 2003 11:51
		Re: Finding if a structure tag name is defined? By: Mark Hadfield on Tue, 14 October 2003 19:35
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 15:19
		Re: Finding if a structure tag name is defined? By: wmconnolley on Tue, 14 October 2003 14:53
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 09:55
		Re: Finding if a structure tag name is defined? By: R.Bauer on Tue, 14 October 2003 09:34
		Re: Finding if a structure tag name is defined? By: David Fanning on Tue, 14 October 2003 07:32

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