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Re: Arrays of Structures [message #52459 is a reply to message #20472]

Thu, 08 February 2007 10:04

Mick Brooks
Messages: 4
Registered: February 2007

Junior Member

On Feb 8, 5:41 pm, "Brian Larsen" <balar...@gmail.com> wrote:

> This is what you did and it is true this is an array with 50 elements
> IDL> HELP, structs.a
> <Expression> INT = Array[50]
>
> but if you look at structs by itself not structs.a, it is the array,
> NOT structs.a
>
> IDL> HELP, structs
> STRUCTS STRUCT = -> <Anonymous> Array[50]
>
> So what is inside the structure?
>
> Here a is inside the struct and it is an int
>
> IDL> HELP, structs, /str
> ** Structure <84bd40c>, 1 tags, length=2, data length=2, refs=1:
> A INT 1

(I think) I'm following you to here...

> Meaning that structs.a[23] doesn't make sense because structs.a is an
> int.

... but this is where you lose me. Doesn't the the first line that you
showed say that structs.a is an array of 50 ints?
Maybe I just can't read the output of HELP properly, but struts.a
certainly sometimes behaves as an array. Try PRINTing it, for
instance.
Or let's compare the output of HELP on a real array of 50 ints:

IDL> HELP, structs.a
<Expression> INT = Array[50]
IDL> HELP, indgen(50)
<Expression> INT = Array[50]

> While structs[23].a does make sense because structs is an array.

Yes, I'm happy with why this is right, but still not clear why
structs.a[23] is wrong.

> This is just one of those lessons that take a while to get a hold of.
>
> Make any sense?

Not really, but thanks for trying.

Cheers,

Mick

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[Message index]

		Arrays of Structures By: Ben Tupper on Wed, 21 June 2000 00:00
		Re: Arrays of Structures By: news.qwest.net on Thu, 08 February 2007 12:52
		Re: Arrays of Structures By: JD Smith on Thu, 08 February 2007 12:42
		Re: Arrays of Structures By: Paul Van Delst[1] on Fri, 09 February 2007 08:01
		Re: Arrays of Structures By: Mick Brooks on Fri, 09 February 2007 02:13
		Re: Arrays of Structures By: Michael Galloy on Thu, 08 February 2007 12:21
		Re: Arrays of Structures By: news.qwest.net on Thu, 08 February 2007 11:44
		Re: Arrays of Structures By: Paul Van Delst[1] on Thu, 08 February 2007 11:32
		Re: Arrays of Structures By: Mick Brooks on Thu, 08 February 2007 11:27
		Re: Arrays of Structures By: Brian Larsen on Thu, 08 February 2007 11:11
		Re: Arrays of Structures By: news.qwest.net on Thu, 08 February 2007 11:09
		Re: Arrays of Structures By: Paul Van Delst[1] on Thu, 08 February 2007 11:02
		Re: Arrays of Structures By: Brian Larsen on Thu, 08 February 2007 10:59
		Re: Arrays of Structures By: Mick Brooks on Thu, 08 February 2007 10:04
		Re: Arrays of Structures By: Brian Larsen on Thu, 08 February 2007 09:41
		Re: Arrays of Structures By: JD Smith on Fri, 09 February 2007 12:51

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