[R] speeding up "sum of squared differences" calculation

Bos, Roger roger.bos at rothschild.com
Tue Oct 22 15:18:00 CEST 2013

Thanks for the Rccp example Ken!  I vaguely knew about Rccp, but I didn't realize how easy it was to use it.

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Kenneth Knoblauch
Sent: Tuesday, October 22, 2013 9:13 AM
To: S Ellison
Cc: r-help at r-project.org
Subject: Re: [R] speeding up "sum of squared differences" calculation

Actually, you don't need to use c() in the dist example, either, which should shave off a few microseconds for a function call.  It was late last night ...


On 22-10-2013 15:08, S Ellison wrote:
>> Conclusion: hard to beat outer() for this purpose in R
> ... unless you use Ken Knoblauch's suggestion of dist() or Rccp.
> Nice indeed.
> S Ellison
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