[Rcpp-devel] Rcpp "version" of R's match function

[Romain Francois]

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
>     Professional R Enthusiast
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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