Re: [R] convert matrix to dataframe with repeating row names

[Prof Brian Ripley]

On Mon, 20 Oct 2008, [EMAIL PROTECTED] wrote:

I have a matrix x with repeating row names.

zz<-matrix(0,4,4)

rownames(zz)=c("a","a","b","b")

data.frame(zz) (?)

The row names on a data frame should be unique.  You can try
as.data.frame(xx, row.names=FALSE) to convert zz to be a data frame.  If
you need the row name information, add it as a column in the data frame,
e.g. mydataframe$rnames <- rownames(zz).  (Note to R-Core: the
documentation for as.data.frame doesn't mention the usage of
row.names=FALSE to ignore row names, but it seems to work consistently.
Does the help page for as.data.frame need updating?)

No.  row.names=FALSE is not intended to work, and did you check every 
single as.data.frame() method?

It just so happens that for the matrix method invalid input for 
'row.names' results in setting default row names.  Other methods may 
differ.


lm(as.formula(paste("final_dat[,5]~",paste(colnames(x),collapse="+"))),x
)

this gives me a error

Error in model.frame.default(formula =
as.formula(paste("final_dat[,5]~",  :

  'data' must be a data.frame, not a matrix or an array

I suspect that if you try class(x), it will be a matrix, not the requisite
data frame.

Regards,
Richie.

Mathematical Sciences Unit
HSL


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--
Brian D. Ripley,                  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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