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Re: Vectorization question [message #21757 is a reply to message #21705]

Fri, 15 September 2000 00:00

Struan Gray
Messages: 178
Registered: December 1995

Senior Member

Liam E. Gumley, Liam.Gumley@ssec.wisc.edu writes:

> How would I vectorize the following operation
>
> for i = 0, n_elements(x) - 1 do a[x[i]] = a[x[i]] + b[i]

I've often wondered if IDL could be modified internally to allow
an implicit loop where the loop variable is only used for indexing
arrays. I've hit several situations where I want to do this sort of
thing, but don't want to write external routines and don't have the
memory to use the 2D trick.

Oh well.

Struan
PS: I tried hard to use HISTOGRAM, but just ended up looping
through the reverse indices array, which a priori is no faster.

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[Message index]

		Vectorization question By: Liam E. Gumley on Mon, 11 September 2000 14:51
		Re: Vectorization question By: Craig Markwardt on Mon, 18 September 2000 00:00
		Re: Vectorization question By: promashkin on Mon, 18 September 2000 00:00
		Re: Vectorization question By: promashkin on Sun, 17 September 2000 00:00
		Re: Vectorization question By: Struan Gray on Fri, 15 September 2000 00:00
		Re: Vectorization question By: Liam E. Gumley on Thu, 14 September 2000 00:00
		Re: Vectorization question By: Liam E. Gumley on Thu, 14 September 2000 00:00
		Re: Vectorization question By: Liam E. Gumley on Thu, 14 September 2000 00:00
		Re: Vectorization question By: Liam E. Gumley on Thu, 14 September 2000 00:00
		Re: Vectorization question By: Liam E. Gumley on Thu, 14 September 2000 00:00

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