On Fri, Dec 18, 2009 at 11:49 AM, wrote:
> On Fri, 18 Dec 2009, Gabriel Becker wrote:
>
> My understanding is that all the really fast vectorized operations are
>> implemented down in C code, not in R. Thus if you wanted to write a
>> vectorized switch, which I agree would be rather nice to have
On Fri, 18 Dec 2009, Gabriel Becker wrote:
My understanding is that all the really fast vectorized operations are
implemented down in C code, not in R. Thus if you wanted to write a
vectorized switch, which I agree would be rather nice to have, you'd need to
do it down there and then write a .Ca
On Fri, Dec 18, 2009 at 2:39 PM, William Dunlap wrote:
> > colchoose( data.frame(a=1:4,b=11:14), c('a','b','b','a'))
> >=> c(1,11,11,1)
>
> I thought you would want c(1,12,13,4), not c(1,11,11,1),
> out of this call. Perhaps I misunderstand your requirements.
>
Sorry, you're r
> -Original Message-
> From: r-devel-boun...@r-project.org
> [mailto:r-devel-boun...@r-project.org] On Behalf Of Stavros Macrakis
> Sent: Friday, December 18, 2009 11:07 AM
> To: r-devel@r-project.org
> Subject: [Rd] Vectorized switch
>
> What is the
My understanding is that all the really fast vectorized operations are
implemented down in C code, not in R. Thus if you wanted to write a
vectorized switch, which I agree would be rather nice to have, you'd need to
do it down there and then write a .Call wrapper for it in R.
The ifelse (C) code w
What is the 'idiomatic' way of writing a vectorized switch statement?
That is, I would like to write, e.g.,
vswitch( c('a','x','b','a'),
a= 1:4,
b=11:14,
100 )
=> c(1, 100, 13, 4 )
equivalent to
ifelse(
