[Rcpp-devel] binding, combining vectors

Hi Romain,

"bind" may be confusing to R users, because "cbind" and "rbind" exist
in R and return matrices. In my opinion, "combine" is a better option.

- Andreas


On Thu, Dec 13, 2012 at 10:01 AM, Romain Francois
<romain at r-enthusiasts.com> wrote:

Hello,

I'd like to add a functionality to "bind" vectors of the same type (well
sugar expressions really, but let's say it is vectors for the sake of
this email).

So essentially I'd like something similar to what "c" does in R :

 > c( letters, letters )

  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p"
"q" "r" "s"
[20] "t" "u" "v" "w" "x" "y" "z" "a" "b" "c" "d" "e" "f" "g" "h" "i" "j"
"k" "l"
[39] "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"


I don't want to call it "c", and I'd like suggestions : combine, bind ?

The idea is to avoid writing code like this:

CharacterVector x, y ;
CharacterVector z( x.size() + y.size() ) ;
int i=0;
for( ; i<x.size(); i++) z[i] = x[i] ;
for( int j=0; j<y.size(); i++, j++) z[i] = y[j] ;

I know it is not a big deal for people to write this code, but for
example this does not handle the names of the elements, ... and
internally I can use more efficient code

Romain

--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30

R Graph Gallery: http://gallery.r-enthusiasts.com

blog:            http://romainfrancois.blog.free.fr
|- http://bit.ly/RE6sYH : OOP with Rcpp modules
`- http://bit.ly/Thw7IK : Rcpp modules more flexible

--
Andreas Alfons
Faculty of Business and Economics, KU Leuven
www.econ.kuleuven.be/andreas.alfons/public/

Romain,

   what about "join"?

       walter.


On Thu, Dec 13, 2012 at 1:15 PM, Andreas Alfons <
andreas.alfons at kuleuven.be> wrote:

Hi Romain,

"bind" may be confusing to R users, because "cbind" and "rbind" exist
in R and return matrices. In my opinion, "combine" is a better option.

- Andreas


On Thu, Dec 13, 2012 at 10:01 AM, Romain Francois
<romain at r-enthusiasts.com> wrote:

Hello,

I'd like to add a functionality to "bind" vectors of the same type (well
sugar expressions really, but let's say it is vectors for the sake of
this email).

So essentially I'd like something similar to what "c" does in R :

 > c( letters, letters )

  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p"
"q" "r" "s"
[20] "t" "u" "v" "w" "x" "y" "z" "a" "b" "c" "d" "e" "f" "g" "h" "i" "j"
"k" "l"
[39] "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"


I don't want to call it "c", and I'd like suggestions : combine, bind ?

The idea is to avoid writing code like this:

CharacterVector x, y ;
CharacterVector z( x.size() + y.size() ) ;
int i=0;
for( ; i<x.size(); i++) z[i] = x[i] ;
for( int j=0; j<y.size(); i++, j++) z[i] = y[j] ;

I know it is not a big deal for people to write this code, but for
example this does not handle the names of the elements, ... and
internally I can use more efficient code

Romain

--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30

R Graph Gallery: http://gallery.r-enthusiasts.com

blog:            http://romainfrancois.blog.free.fr
|- http://bit.ly/RE6sYH : OOP with Rcpp modules
`- http://bit.ly/Thw7IK : Rcpp modules more flexible

--
Andreas Alfons
Faculty of Business and Economics, KU Leuven
www.econ.kuleuven.be/andreas.alfons/public/