[R] rbind and data.frame

Göran Broström gb at stat.umu.se
Fri Dec 7 11:04:28 CET 2001

On Wed, 5 Dec 2001, Göran Broström wrote:

> My real problem is how to create a data frame in a sequentially growing
> manner, when I know the final size (no of cases). I want to avoid to
> call 'rbind' many times, and instead create an 'empty' data frame in
> one call, and then fill it. Are there better ways of doing this?

Got no answer to this one, so I provide one myself:

The answer is: Yes, definitely. I did this, with pure  R  code, and 
created a new data frame with around 58000 records. It took 7 hours to 
run. I then did it with compiled code (Fortran), and that made a slight
difference:  It took 4.8 seconds(!).


r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list