Re: [R] convert matrix to dataframe with repeating row names
> > 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$rnames <- rownames(zz). (Note to R-Core: the
> > documentation for as.data.frame doesn't mention the usage of
> > row.names=FALSE to ignore row names, but it seems to work
consistently.
> > Does the help page for as.data.frame need updating?)
>
> No. row.names=FALSE is not intended to work, and did you check every
> single as.data.frame() method?
>
> It just so happens that for the matrix method invalid input for
> 'row.names' results in setting default row names. Other methods may
> differ.
row.names=FALSE seems a natural way of supressing existing row names to
me, since it corresponds nicely to using row.names=FALSE in write.csv.
Currently it seems that if a matrix has duplicate row names, then
converting it to be a data frame requires
rnames <- rownames(mymatrix)
rownames(mymatrix) <- NULL
as.data.frame(mymatrix)
rownames(mymatrix) <- rnames
Ideally, three of these lines of code shouldn't really need to be there.
If you disagree that allowing row.names=FALSE is a good idea, or you don't
want to change the function interface, then perhaps having as.data.frame
check for duplicates and throwing a warning (rather than an error) would
be preferable behaviour. I do realise that there are dozens of
as.data.frame methods, and the documentation does state that "Few of the
methods check for duplicated row names", but it would be beneficial from a
user standpoint.
Regards,
Richie.
Mathematical Sciences Unit
HSL
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Re: [R] convert matrix to dataframe with repeating row names
On Mon, 20 Oct 2008, [EMAIL PROTECTED] wrote:
I have a matrix x with repeating row names.
zz<-matrix(0,4,4)
rownames(zz)=c("a","a","b","b")
data.frame(zz) (?)
The row names on a data frame should be unique. You can try
as.data.frame(xx, row.names=FALSE) to convert zz to be a data frame. If
you need the row name information, add it as a column in the data frame,
e.g. mydataframe$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)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax: +44 1865 272595
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Re: [R] convert matrix to dataframe with repeating row names
> 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?)
> 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
ATTENTION:
This message contains privileged and confidential inform...{{dropped:20}}
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
