Re: [R] Convert matrix to data.frame

From: Tony Plate <tplate_at_acm.org>
Date: Fri 13 Jan 2006 - 07:27:30 EST

When I try converting a matrix to a data frame, it works for me:

 > x <- matrix(1:6,ncol=2,dimnames=list(LETTERS[1:3],letters[24:25]))  > data.frame(x)
   x y
A 1 4
B 2 5
C 3 6
 > str(data.frame(x))
`data.frame': 3 obs. of 2 variables:
  $ x: int 1 2 3
  $ y: int 4 5 6
 >

You can also use as.data.frame() to convert a matrix to a data.frame (but note that if colnames are missing form the matrix, as.data.frame()   constructs different colnames than does data.frame().

You say "it didn't work" -- it's difficult to help with such a non-specific complaint. Can you explain exactly how it didn't work for you? (e.g., show the exact error message).

Chia, Yen Lin wrote:
> Hi all,
>
>
>
> I wonder how could I convert a matrix A to a dataframe such that
> whenever I'm running a linear model such lme, I can use A$x1? I tried
> data.frame(A), it didn't work. Should I initialize A not as a matrix?
> Thanks.
>
>
>
> Yen Lin
>
>
> [[alternative HTML version deleted]]
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jan 13 07:33:46 2006

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