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Re: Array of Structures [message #38996 is a reply to message #19984]

Thu, 15 April 2004 08:51

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Dan Steinberg wrote:

> I am wondering if it is possible to create an array of structures. I
> want to read multiple different anonymous structures into a single
> variable so I can reference each structure using the variable name and
> the array index. Is this possible?
>
> -Dan

Yes

but there is a small risk that it only works with named structures.
It is only guaranted that it works with named structures.

First way

IDL> a=create_struct(name='tst','file','','bmp',bytarr(10,20))
IDL> help,a,/str
** Structure TST, 2 tags, length=212, data length=212:
FILE STRING ''
BMP BYTE Array[10, 20]

IDL> s=replicate(a,10)
IDL> help,s
S STRUCT = -> TST Array[10]

second way is to use the structure name

IDL> b=[a,{tst}]
IDL> help,b
B STRUCT = -> TST Array[2]

third way

IDL> c=[a,a]
IDL> help,c,/str
IDL> help,c
C STRUCT = -> TST Array[2]

This was the creation.

Accessing:

IDL> help,c[0].(0)
<Expression> STRING = ''

IDL> help,c[0].(1)
<Expression> BYTE = Array[10, 20]

IDL> help,c[0].(1)[0,*]
<Expression> BYTE = Array[1, 20]

IDL> help,c[0].bmp[0,*]
<Expression> BYTE = Array[1, 20]

If the sizes or type of your variables are different I suggest to use
pointer.

Cheers

Reimar
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
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[Message index]

		Array of structures. By: Nicolas Decoster on Tue, 16 May 2000 00:00
		Re: Array of structures. By: Ben Tupper on Tue, 16 May 2000 00:00
		Re: Array of structures. By: John-David T. Smith on Tue, 16 May 2000 00:00
		Re: Array of Structures By: R.Bauer on Thu, 15 April 2004 10:39
		Re: Array of Structures By: Rick Towler on Thu, 15 April 2004 09:38
		Re: Array of Structures By: Craig Markwardt on Thu, 15 April 2004 09:03
		Re: Array of Structures By: R.Bauer on Thu, 15 April 2004 08:51
		Re: Array of Structures By: K. Bowman on Thu, 15 April 2004 08:29

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