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subscripting arrays with dim > 1 [message #12707]

Fri, 28 August 1998 00:00

fireman
Messages: 49
Registered: August 1991

Member

I'd like to reference an array with a variable containing a subscript for
each dimension, passing the subscripts as an array. For instance:

IDL> array = indgen(5,5)
IDL> print,array
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23 24
IDL> print,array[0,4]
20

But I can't seem to reference each dimension. Instead, the subscript array
is passed as two instances of a single subscript:

IDL> index=[0,4]
IDL> print,array[index]
0 4

I can of course calculate a single index, but it seems a bit clunky:

IDL> s=size(array)
IDL> print,s
2 5 5 2 25
IDL> print,array[index(0)*s(1)+index(1)*s(2)]
20
- or -
IDL> print,array[long(total(s(1:s(0))*index))]
20

Is there a better way?
Gwyn

--
__.
/ | , , , , , ,_ Gwyn F. Fireman
(__/|/(_(_)(_/|/| |_/ General Sciences Corporation
/| /| Gwyn.Fireman@gsfc.nasa.gov MODIS Characterization Supp. Team
(_/ (_/ 301-352-2118

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[Message index]

		subscripting arrays with dim > 1 By: fireman on Fri, 28 August 1998 00:00
		Re: subscripting arrays By: wem on Mon, 14 November 2005 01:53
		Re: subscripting arrays By: David Fanning on Sun, 13 November 2005 21:07

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