[R] coercing columns
Marc Schwartz
MSchwartz at MedAnalytics.com
Fri Jan 7 17:32:42 CET 2005
On Fri, 2005-01-07 at 15:47 +0100, Christoph Scherber wrote:
> Dear all,
>
> I have a data frame that looks like this:
>
> c1 c2 c3
> A B C
> B C A
> A A B
>
> and so on;
>
> I´d like to produce one single vector consisting of the columns c1,c2,
> c3, such that
>
> vector=("A","B","A","B","C","A","C","A","B")
>
> I guess it´s easy to do but I don´t know how...Can anyone help me?
>
> Thanks a lot!
> Christoph
> as.vector(as.matrix(df))
[1] "A" "B" "A" "B" "C" "A" "C" "A" "B"
If you review the help for as.matrix, it indicates:
'as.matrix' is a generic function. The method for data frames will
convert any non-numeric/complex column into a character vector
using 'format' and so return a character matrix, except that
all-logical data frames will be coerced to a logical matrix.
So using as.matrix() converts the 'df' columns into a character matrix,
which is then converted into a vector using as.vector().
HTH,
Marc Schwartz
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