[R] duplicate row.names

[Simon Blomberg]

I think you need to be a bit more specific for us to be able to help you. At least provide a toy problem which replicates the error. Does this do what you want?

dat1 <- data.frame (x=rnorm(100), y=rnorm(100)) #make up some data
dat2 <- data.frame (x=rnorm(100), y=rnorm(100))
write.table(dat1, file="test1.txt") #write data to files
write.table(dat2, file="test2.txt")
F<- NULL # Initialise
for (i in 1:2) F <- rbind(F, read.table(paste("test", i, ".txt", sep="")))
F <- data.frame(F, row.names=NULL) # clean up row names.

Hope this helps,

Simon.

Simon Blomberg, PhD
Depression & Anxiety Consumer Research Unit
Centre for Mental Health Research
Australian National University
http://www.anu.edu.au/cmhr/
Simon.Blomberg at anu.edu.au  +61 (2) 6125 3379


> -----Original Message-----
> From: John Smith [mailto:JSmith at telicmanagement.com]
> Sent: Thursday, 17 July 2003 10:06 AM
> To: 'r-help at stat.math.ethz.ch'
> Subject: [R] duplicate row.names 
> 
> 
> I am looping over many data files and reading in the data 
> with	 F <-
> read.table(filename)	to read in a 22000 by 15 matrix.  Works 
> fine on the
> first matrix F, but I get the following error when the second 
> file is read
> into F:
> 
> Error in "row.names<-.data.frame"(*tmp*, value = row.names) : 
>         duplicate row.names are not allowed
> 
> I have tried picking a column of the matrix and making that 
> my rownames by
> doing		rownames <- as.vector(F[,4])
> -but that does not work.
> 
> Each row in my matrix is not unique.
> 
> Any suggestions greatly appreciated.
> 
> John
> 
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