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Re: Name of arrays [message #79329 is a reply to message #79269]

Tue, 21 February 2012 06:49

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Feb 21, 9:35 am, Israel Rodriguez Hermelo <israelherm...@gmail.com>
wrote:
> On Feb 21, 2:36 pm, David Fanning <n...@idlcoyote.com> wrote:
>
>
>
>
>
>
>
>
>
>> Israel Rodriguez Hermelo writes:
>>> First of all, I want to thank you all of you for your suggestions.
>>> Second, just say that all this months, days and temperatures was just
>>> an example of what I want to do, so I need a general way to proceed.
>>> Third, I'm running IDL v7, so the solutions for IDL v8 don't work for
>>> me.
>
>>> So I'm trying to learn how to use structures, but they are a bit
>>> confusing to me and the information I have obtained from google is not
>>> helping too much. I would appreciate any example or link to a webpage
>>> showing how to use structures. Thanks in advance!
>
>> Structures!? You mean pointers, right? You need
>> flexibility and structures are, well, just about
>> the least flexible solution of all time. Are you
>> sure you mean structures?
>
>> Cheers,
>
>> David
>
>> --
>> David Fanning, Ph.D.
>> Fanning Software Consulting, Inc.
>> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
>> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
>
> hehe yes, I was trying to do it with structures but I was already
> thinking that structures are not flexible enough. I'll try with
> pointers then. I'll let you know how it goes.
>

No, structures are easy. You can add as many elements as you want and
they can be any size that you want.

; First you create a dummy structure, or add some overall "metadata"
information if you want.
my_struct = {file_date:'2012-01-03'} ;; Whatever you want

; Then add as many data points as you want.
my_struct = create_struct(my_struct, TEMPERATURE+MONTH(0), fltarr(28))
my_struct = create_struct(my_struct, TEMPERATURE+MONTH(1), fltarr(30))
...
my_struct = create_struct(my_struct, TEMPERATURE+MONTH(11),
fltarr(30))

Pointers introduce their own overhead of allocating, managing and de-
allocating them. Structures are totally extensible and have basically
no mental overhead.

Later on, you can retrieve the contents with TAG_NAMES(), and the
"structure array" notation my_struct.(N).

Craig

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[Message index]

		Name of arrays By: Israel Rodriguez Herm on Sun, 19 February 2012 04:30
		Re: Name of arrays By: David Fanning on Wed, 22 February 2012 08:34
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 03:40
		Re: Name of arrays By: Brian Wolven on Wed, 22 February 2012 08:22
		Re: Name of arrays By: David Fanning on Wed, 22 February 2012 05:28
		Re: Name of arrays By: Israel Rodriguez Herm on Wed, 22 February 2012 02:04
		Re: Name of arrays By: penteado on Thu, 23 February 2012 07:08
		Re: Name of arrays By: Brian Wolven on Tue, 21 February 2012 14:53
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:44
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 14:35
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:33
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:27
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:21
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:02
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 16:12
		Re: Name of arrays By: penteado on Tue, 21 February 2012 14:11
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 14:09
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 14:06
		Re: Name of arrays By: penteado on Tue, 21 February 2012 13:58
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 13:43
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 12:36
		Re: Name of arrays By: Craig Markwardt on Tue, 21 February 2012 08:38
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 07:12
		Re: Name of arrays By: Craig Markwardt on Tue, 21 February 2012 06:49
		Re: Name of arrays By: Paul Van Delst[1] on Tue, 21 February 2012 06:50
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 06:35
		Re: Name of arrays By: David Fanning on Tue, 21 February 2012 05:36
		Re: Name of arrays By: Israel Rodriguez Herm on Tue, 21 February 2012 04:45
		Re: Name of arrays By: Craig Markwardt on Mon, 20 February 2012 19:17
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 12:21
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 12:17
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 11:16
		Re: Name of arrays By: Paul Van Delst[1] on Thu, 23 February 2012 10:32
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 10:14
		Re: Name of arrays By: David Fanning on Thu, 23 February 2012 09:30
		Re: Name of arrays By: penteado on Thu, 23 February 2012 09:19
		Re: Name of arrays By: Israel Rodriguez Herm on Thu, 23 February 2012 09:08

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