[R] About populating a dataframe in a loop

[lily li]

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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