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Re: which array dimensions are contiguous? [message #47522 is a reply to message #47521]

Tue, 14 February 2006 02:31

greg michael
Messages: 163
Registered: January 2006

Senior Member

Thanks, David. My question was really only about whether the first
dimensions of an array are the contiguous ones, to which I understand
the answer is yes. The indexing mess is different (and probably worse)
than the one I was imagining, so thanks for that, too.

Still, there's something in that article I couldn't grasp...

IDL> myArray = FltArr(3660, 1680)
IDL> indices = Randomu(seed, 100000) * 3660L * 1680L
IDL> myArray[indices, indices] = 5

I'd have understood if the 3rd line said myArray[indices] = 5. What's
going on here? Why doesn't it cause an error to put in a list of
indices which exceed the dimension?

IDL> print,max(indices)
6.14869e+006

I suppose they're being first enumerated into a single list, and then
being applied as 1-d subscripts? I wouldn't have said "No problems with
this. "!

regards,
Greg

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[Message index]

		Re: which array dimensions are contiguous? By: greg michael on Tue, 14 February 2006 02:51
		Re: which array dimensions are contiguous? By: greg michael on Tue, 14 February 2006 02:31
		Re: which array dimensions are contiguous? By: David Fanning on Mon, 13 February 2006 12:04

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