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Finding if a structure tag name is defined? [message #36709]

Tue, 14 October 2003 05:28

wmconnolley
Messages: 106
Registered: November 2000

Senior Member

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.

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William M Connolley | wmc@bas.ac.uk | http://www.antarctica.ac.uk/met/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
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Re: Finding if a structure tag name is defined? [message #36737 is a reply to message #36709]

Mon, 20 October 2003 12:17

wmconnolley
Messages: 106
Registered: November 2000

Senior Member

Reimar Bauer <R.Bauer@fz-juelich.de> wrote:

> here is another routine which is able to extract parts of an _extra
> structure.

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

Hi. Thanks for this, but your earlier routine did all I needed and it was fine!

-W.

--
William M Connolley | wmc@bas.ac.uk | http://www.antarctica.ac.uk/met/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
I'm a .signature virus! copy me into your .signature file & help me spread!

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Re: Finding if a structure tag name is defined? [message #36740 is a reply to message #36709]

Fri, 17 October 2003 13:36

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.
>

Dear w

here is another routine which is able to extract parts of an _extra
structure.

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

If you have some rules for the keywords then you could separate them and
execute them on obe application

keywords:
text_color, text_size ...

They could be extracted into a new _extra structure by
e=extract_extra(extra,'text_*')

and so on.

regards

Reimar

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