[Rcpp-devel] Rcpp "version" of R's match function
Romain Francois
romain at r-enthusiasts.com
Thu Nov 15 15:58:18 CET 2012
Help is very welcome. Why github though ?
Le 15/11/12 15:42, Willem Ligtenberg a écrit :
> Would be nice to keep the list and the progress on github.
> Other might pitch in and help out, I am also interested, just don't know
> how much time I can spend on it.
>
> Kind regards,
>
> Willem
>
>
> On Thu, Nov 15, 2012 at 3:24 PM, Romain Francois
> <romain at r-enthusiasts.com <mailto:romain at r-enthusiasts.com>> wrote:
>
> Le 15/11/12 14:52, Hadley Wickham a écrit :
>
> R
> utilisateur système écoulé
> 0.338 0.024 0.362
> R (second time)
> utilisateur système écoulé
> 0.262 0.000 0.262
> match_ manual Rcpp
> utilisateur système écoulé
> 0.144 0.000 0.144
> match__ internal Rcpp
> utilisateur système écoulé
> 0.134 0.000 0.133
>
>
> Nice!
>
> Worth noting that the R version gets better the second time.
> I guess R keeps
> its hash table somewhere.
>
>
> Hmmm - see
> http://cran.r-project.org/web/__packages/fastmatch/index.html
> <http://cran.r-project.org/web/packages/fastmatch/index.html>
>
>
> Ouch. Simon wins:
>
> expr min lq median uq max
> 1 fmatch(xx, letters) 59.4727 60.29989 74.18049 77.94288 112.2938
> 2 match__(xx, letters) 137.3878 137.77486 138.33766 152.14018 193.3748
> 3 match_(xx, letters) 147.7115 148.36442 149.20221 162.82343 171.3181
> 4 match(xx, letters) 288.4345 293.10380 294.58833 296.26125 333.1210
>
>
> Hadley
>
> PS. Would you be interested in a set of R functions that from a
> quick
> skim of the R sources that I think could be much much faster if
> implemented in Rcpp?
>
>
> Sure. Time I have available will decide what I do of the list ^^.
>
>
> --
> Romain Francois
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--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
R Graph Gallery: http://gallery.r-enthusiasts.com
`- http://bit.ly/SweN1Z : SuperStorm Sandy
blog: http://romainfrancois.blog.free.fr
|- http://bit.ly/RE6sYH : OOP with Rcpp modules
`- http://bit.ly/Thw7IK : Rcpp modules more flexible
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