[R] naming vectors/ matrices in R
Dieter Menne
dieter.menne at menne-biomed.de
Tue Mar 31 17:30:21 CEST 2009
emj83 <stp08emj <at> shef.ac.uk> writes:
>
>
> I would like to create a series of vectors in a loop and name them with
> letters.
>
> I know the command letters gives me the 26 letters of the alphabet.
>
> For example, I have a dataframe, called A, with 6 columns.
>
> >B<-length(A)
> >C<-letters(1:B)
> [1] "a" "b" "c" "d" "e" "f"
>
> I would like to extract the first letter "a", and put the first column of
> dataframe A in a vector called "a"
>
> >C<-e[1]
> [1] "a"
>
> but when I type
>
> >e[1]=A[,1]
>
> Warning message:
> In e[1] =A[, 1] :
> number of items to replace is not a multiple of replacement length
>
This is really difficult to understand. Try to make the example so that
is can be pasted in R. For example, where is your dataframe A?
A = data.frame(a=1:10,b=1:10)
e = A[,1]
e
Dieter
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