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Re: Loop Arrays [message #26977]

Tue, 09 October 2001 12:59

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

From: "Ken Mankoff" <mankoff@lasp.colorado.edu>
> I am interested in creating circular arrays, where subscripts that would
> be out-of-bounds on a regular array just start indexing on the other side
> of the array.

> I think that overloading the [] operators is not an option from my
> understanding of IDL. Does anyone know if this is possible?

It's not possible. IDL does not support operator overloading.

> Desirable? Dumb?

Maybe. No.

You can do quite a lot with ordinary arrays using arrays of indices, eg

a = indgen(10)
print, a[ [0,10,20,100] mod n_elements(a)]

BTW another indexing extension that appeals to me is Python's use of
negative indices to refer to positions relative to the end of the array,
eg -1 refers to the rightmost element.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield
National Institute for Water and Atmospheric Research

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[Message index]

		Re: Loop Arrays By: Mark Hadfield on Tue, 09 October 2001 12:59
		Re: Loop Arrays By: David Fanning on Tue, 09 October 2001 12:57
		Re: Loop Arrays By: Ken Mankoff on Tue, 09 October 2001 15:06
		Re: Loop Arrays By: Martin Downing on Mon, 15 October 2001 14:43
		Re: Loop Arrays By: Ken Mankoff on Mon, 15 October 2001 09:35

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