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Re: Can this be vectorized? [message #17454 is a reply to message #17445]

Tue, 26 October 1999 00:00

Struan Gray
Messages: 178
Registered: December 1995

Senior Member

John E. Davis, davis@space.mit.edu writes:

> What is the best way to vectorize this?

In IDL an alternative to vectorisation is to use the fast built-in
function HISTOGRAM. In your case you should take the histogram of 'I'
and use the REVERSE_INDICES keyword to get a list of which elements
are in which bin. Summing the same elements of 'X' will give you the
answer you want. This will work even if 'I' and 'X' are not in
ascending order. There is some memory overhead, but it is of the same
order as creating working copies of your original data.

Struan

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[Message index]

		Re: Can this be vectorized? By: davis on Wed, 27 October 1999 00:00
		Re: Can this be vectorized? By: davis on Tue, 26 October 1999 00:00
		Re: Can this be vectorized? By: Struan Gray on Tue, 26 October 1999 00:00
		Re: Can this be vectorized? By: Gautam Sethi on Tue, 26 October 1999 00:00
		Re: Can this be vectorized? By: Bert Jagers on Tue, 26 October 1999 00:00

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