如何最有效地将行列表转换为R中的数据帧

Question

To be more specific, I have a list whose elements are vectors which correspond to one row of a data frame.

The method outline here: https://stackoverflow.com/a/12382764/2472107

is extremely efficient/fast but it only works for lists that contain vectors that correspond to columns in a data frame.

I tried transposing the data frame afterwards, but this takes exceedingly long.

Thanks!

Answer 1

From the context I gather that your elements are identical, say they are all doubles . If you want to transpose the data, it is much more efficient to put them in a matrix . You can do this with matrix(unlist(x), ncol=length(x)) , where x is your list.

The code above also does the transpose. If you want to keep it as is you could say matrix(unlist(x), nrow=length(x), byrow=TRUE) .