About populating a dataframe in a loop
Hi Rui, Thanks for your reply. Yes, when I tried to rbind two dataframes, it works. However, if there are more than 50, it got stuck for hours. When I tried to terminate the process and open the csv file separately, it has only one data frame. What is the problem? Thanks.
On Fri, Jan 6, 2017 at 11:12 AM, Rui Barradas <ruipbarradas at sapo.pt> wrote:
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.
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