[R] split strings in a vector and convert it to a data.frame
David Winsemius
dwinsemius at comcast.net
Wed Feb 10 00:54:28 CET 2010
On Feb 9, 2010, at 6:46 PM, Martin Batholdy wrote:
> hi,
>
> I have a vector full of strings like;
>
>
> xy_100_ab xy_101_ab xy_102_ab xy_103_ab
>
>
> I want to seperate each string in three pieces and the separator
> should be the "_"
>
> at the end I want a data.frame like:
>
> column1 column2 column3
> xy 100 ab
> xy 101 ab
> xy 102 ab
> xy 103 ab
>
There are probably easier ways but this works:
> as.data.frame( t(sapply(1:4, function(x) strsplit(vec, "_")[[x]])) )
V1 V2 V3
1 xy 100 ab
2 xy 101 ab
3 xy 102 ab
4 xy 103 ab
I needed to transpose the matrix that resulted from the "sideways
presentation" of the data.
>
> I tried strsplit but I couldn't figure out how to convert the list I
> get into a data.frame.
>
> I just need a function like read.table. But it seems that read.table
> only can handle files, not vectors...
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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