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Re: Reading in data question [message #66126]

Mon, 20 April 2009 02:33

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

David Fanning schrieb:
> tomandwilltamu08@gmail.com writes:
>
>> After going back through your code carefully, it all makes perfect
>> sense and is very well written. I'm not sure I could have thought of
>> that myself - but I guess thats why I'm the guy asking the question
>> and you're the guy answering the question...
>
> I'll just point out one other thing for the article you
> are writing. The nice thing about arrays of structures
> is that you can easily pull vectors out of the structure
> fields.
>
> So, in the example yesterday, if you wanted a vector
> of all the "int_1" values in the third "unit" in the
> file, you can do this:
>
> IDL> d = unpackData(data[2])
> IDL> help, d
> D STRUCT = -> <Anonymous> Array[5]
> IDL> vector = Reform(d.int_1[*])
> IDL> print, vector
> 1 2 3 4 5
>
> Cheers,
>
> David

and reads in combination with structures is also very nice.

IDL> a=make_Array(5,2,/ind)
IDL> help,a
A FLOAT = Array[5, 2]
IDL> print,a
0.00000 1.00000 2.00000 3.00000 4.00000
5.00000 6.00000 7.00000 8.00000 9.00000
IDL> s=replicate({a:fltarr(5)},2)
IDL> help,s
S STRUCT = -> <Anonymous> Array[2]
IDL> reads, a, s
IDL> print,s
{ 0.00000 1.00000 2.00000 3.00000 4.00000
}{
5.00000 6.00000 7.00000 8.00000 9.00000
}

Of course that is a very simple example. But you can feel the power. :)

cheers
Reimar

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[Message index]

		Re: Reading in data question By: R.Bauer on Mon, 20 April 2009 02:33
		Re: Reading in data question By: David Fanning on Fri, 17 April 2009 10:37
		Re: Reading in data question By: tomandwilltamu08 on Fri, 17 April 2009 10:21
		Re: Reading in data question By: David Fanning on Fri, 17 April 2009 09:10
		Re: Reading in data question By: tomandwilltamu08 on Fri, 17 April 2009 08:32
		Re: Reading in data question By: David Fanning on Thu, 16 April 2009 22:04

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