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Re: Arrays of Structures [message #52451 is a reply to message #20472]

Thu, 08 February 2007 11:27

Mick Brooks
Messages: 4
Registered: February 2007

Junior Member

On Feb 8, 7:09 pm, "R.G. Stockwell" <n...@email.please> wrote:

>> ... 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?
>
> Not exactly. The key point is that structs.a is an EXPRESSION.
> Also, "struct" is an array of structures.

Yes, this struck me as I drove home from work. I don't have IDL here,
but will be trying
IDL> INDGEN(50)[23]
first thing in the morning

> You cannot do
> IDL> EXPRESSION(10)
> , you must first cast the expression
> IDL> (EXPRESSION)[10]
>
> It is not an operator precedence thing.

Yes, I'd looked at the precedence table and made the same conclusion
as you and Paulv.

All that's left is to explain why we get the extra leading dimension
when subscripting an expression-which-evaluates-to-an-array-of-ints
thing (i.e. structs.a) with multiple indices (or [*]).
This was the actual question I was asked by a user of the module I'd
written - he was seeing these extra leading dimensions, and queried
whether my structure was somehow broken. I couldn't answer, and so
came up with the simpler case we're discussing.

Thanks for all your help,

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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