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Vectorization question [message #21705]

Mon, 11 September 2000 14:51

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Given the following arrays

a = intarr(10)
x = [2, 2, 2, 3, 3, 4]
b = [1, 3, 4, 2, 1, 8]

How would I vectorize the following operation

for i = 0, n_elements(x) - 1 do a[x[i]] = a[x[i]] + b[i]

To achieve this result

print, a, format='(10i4)'
0 0 8 3 8 0 0 0 0 0

In the real-world case where this occurs, I need to repeat this kind of
operation several hundred times, where the size of 'a' is around
1,000,000 and the size of 'x' is around 100,000 ('a' and 'b' are float
type in the real-world case).

Many thanks for any suggestions.

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley

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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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