Hello,

Works with me:

set.seed(6574)

pre.mat = data.frame()
for(i in 1:10){
    mat.temp = data.frame(x = rnorm(5), A = sample(LETTERS, 5, TRUE))
    pre.mat = rbind(pre.mat, mat.temp)
}

nrow(pre.mat)  # should be 50


Can you give us an example that doesn't work?

Rui Barradas

Em 06-01-2017 18:00, lily li escreveu:
Hi R users,

I have a question about filling a dataframe in R using a for loop.

I created an empty dataframe first and then filled it, using the code:
pre.mat = data.frame()
for(i in 1:10){
     mat.temp = data.frame(some values filled in)
     pre.mat = rbind(pre.mat, mat.temp)
}
However, the resulted dataframe has not all the rows that I desired for.
What is the problem and how to solve it? Thanks.

        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.


______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Reply via email to