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Re: Indexing structures of different type [message #15999 is a reply to message #15921]

Tue, 22 June 1999 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Donglai Gong Rm3110 x1569 wrote:
>
> Hi, does anyone know how to index structures of different types in IDL?
>
> REPLICATE won't work since it creates an array of the same structure, so
> I'm thinking of doing a structure of structures. However I don't know
> how to index them for use in a loop. Thanks in advance.
>
> Donglai Gong

Use an array of pointers and index that array:

struct_ptrs = ptrarr(10, /allocate_heap)

*struct_ptrs[0] = struct1
*struct_ptrs[1] = struct2
...

(*struct_ptrs[0]).tag1 = ...

Check out the docs for PTRARR, PTR_NEW, PTR_FREE, and PTR_VALID.

Also look at TAG_NAMES and the use of tag *numbers* instead of
names when accessing structure elements.

Dave Foster
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Indexing structures of different type By: Donglai Gong Rm3110 x on Thu, 17 June 1999 00:00
		Re: Indexing structures of different type By: David Foster on Tue, 22 June 1999 00:00
		Re: Indexing structures of different type By: Pavel Romashkin on Mon, 28 June 1999 00:00

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