[R] Fwd: which is faster "for" or "apply"

[Karim Mezhoud]

Thanks,
It seems for loop spends less time ;)

with
dim(DataFrame)
[1] 338  70

For loop has
   user  system elapsed
  0.012   0.000   0.012

and apply has
  user  system elapsed
  0.020   0.000   0.021

  Ô__
 c/ /'_;~~~~kmezhoud
(*) \(*)   ⴽⴰⵔⵉⵎ  ⵎⴻⵣⵀⵓⴷ
http://bioinformatics.tn/



On Wed, Dec 31, 2014 at 8:54 AM, Berend Hasselman <bhh at xs4all.nl> wrote:

>
> > On 31-12-2014, at 08:40, Karim Mezhoud <kmezhoud at gmail.com> wrote:
> >
> > Hi All,
> > I would like to choice between these two data frame convert. which is
> > faster?
> >
> >   for(i in 1:ncol(DataFrame)){
> >
> >                    DataFrame[,i] <- as.numeric(DataFrame[,i])
> >                }
> >
> >
> > OR
> >
> > DataFrame <- as.data.frame(apply(DataFrame,2 ,function(x) as.numeric(x)))
> >
> >
>
> Try it and use system.time.
>
> Berend
>
> > Thanks
> > Karim
> >  Ô__
> > c/ /'_;~~~~kmezhoud
> > (*) \(*)   ⴽⴰⵔⵉⵎ  ⵎⴻⵣⵀⵓⴷ
> > http://bioinformatics.tn/
> >
> >       [[alternative HTML version deleted]]
> >
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>

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