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Re: Distance between two sets of datapoints [message #70223]

Fri, 26 March 2010 15:11

Maxwell Peck
Messages: 61
Registered: February 2010

Member

Thanks Ken,

It is definitely much much faster (from 30 minutes for looping only to
1 minute). It is difficult to characterise the speedup entirely
because I was able to add a lot more of the calculations inside the
loop, na is about 700 times larger than nb. I think I must have done
something stupid the first time I tried this and looped over the other
dimension hence my confusion.

Cheers,
Max

On Mar 27, 12:11 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < eb0d2a64-900b-4c9e-9599-699dcd3da...@k4g2000prh.googlegroups .com >,
> Maxwell Peck <maxjp...@gmail.com> wrote:
>
>> Thanks Ken, I'll give it a shot. I had tried a similar loop (I
>> thought) but it seemed to be very slow that is why i was looking at
>> vectorising it similar to distance_measure.
>
>>> FOR i = 0, nb-1 DO dist[0,i] = SQRT((xb[i] - xa)^2 + (yb[i] - ya)^2)
>
> This should vectorize reasonably well if na is large and nb is
> not too large.
>
> Ken

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[Message index]

		Re: Distance between two sets of datapoints By: Maxwell Peck on Fri, 26 March 2010 15:11
		Re: Distance between two sets of datapoints By: Kenneth P. Bowman on Fri, 26 March 2010 06:11
		Re: Distance between two sets of datapoints By: Gray on Fri, 26 March 2010 06:16
		Re: Distance between two sets of datapoints By: Maxwell Peck on Thu, 25 March 2010 12:38
		Re: Distance between two sets of datapoints By: Kenneth P. Bowman on Thu, 25 March 2010 12:04
		Re: Distance between two sets of datapoints By: Kenneth P. Bowman on Thu, 25 March 2010 07:55
		Re: Distance between two sets of datapoints By: Maxwell Peck on Thu, 25 March 2010 03:46

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