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thank you for your response, but please note the last para of my question.

necromancer
– necromancer

2012-05-18 20:21:53 +00:00
Commented May 18, 2012 at 20:21
If you're worried about performance, this is about as good as it can get. These are still vector operations and are very fast.

Phonon
– Phonon

2012-05-18 20:27:40 +00:00
Commented May 18, 2012 at 20:27
yes, i understand; but a sophisticated implementation could effectively do this as an optimization of a pure matrix operations specification.

necromancer
– necromancer

2012-05-18 20:28:58 +00:00
Commented May 18, 2012 at 20:28
-1: You can do it faster without the sum: use matrix multiplication on the transpose instead of elementwise.

Eitan T
– Eitan T

2012-05-18 20:42:49 +00:00
Commented May 18, 2012 at 20:42
1

@Phonon My downvote is locked, but if agksmehx finds your solution to be consistently faster you deserve an upvote and I will stand corrected. Edit your answer somehow and I will change my vote to an upvote instead.

Eitan T
– Eitan T

2012-05-18 21:38:59 +00:00
Commented May 18, 2012 at 21:38

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