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Re: Indexing structures of different type [message #15914]

Thu, 17 June 1999 00:00

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Donglai Gong Rm3110 x1569 <donglai@eden.rutgers.edu> writes:
>
> 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.

If you are *really* trying to glue a bunch of different types
together, you should probably structures as you say.

How to loop over them? This is easily done with a little magic:

;; Initialize your structure
s = {u:0L, v:0D, w:intarr(5), x:{a:1, b:2}, y:'hello'}

n = n_tags(s)
for i = 0L, n-1 do begin
;; The magic is here:
f = s.(i)

;; Operate on f here:
print, f
endfor

However, you should be aware that IDL structures are pretty slow to
operate on, especially when you build large ones. [ Some versions of
IDL have a limit on the number of elements in a structure too. ]

Good luck,
Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@astrog.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Indexing structures of different type By: Craig Markwardt on Thu, 17 June 1999 00:00
		Re: Indexing structures of different type By: Liam Gumley on Thu, 17 June 1999 00:00
		Re: Indexing structures of different type By: Donglai Gong Rm3110 x on Thu, 17 June 1999 00:00
		Re: Indexing structures of different type By: davidf on Thu, 17 June 1999 00:00

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