Markus Loecher-4 wrote:
>
> Dear R users,
> I had somehow expected that read.table() would treat the column specified
> by
> the row.names argument as of class character. That seems to be the only
> sensible class allowed for a column containing row names. However, that
> does
> not seem to be the case, as the following example shows:
>
> x <- cbind.data.frame(ID = c("010007787048271871", "1007109516820319",
> "10094843652996959", "010145176274075487"), X1 = 1:4, X2 = 4:1)
> [...snip...]
>
As a better alternative, why not move directly the first column in the
rownames?
rownames(x) <- x$ID
write.table(x[, -1], "tmp.txt")
y <- read.table("tmp.txt", header=T)
y
X1 X2
010007787048271871 1 4
1007109516820319 2 3
10094843652996959 3 2
010145176274075487 4 1
In this case, X1 and X2 variables are read as numeric, while the first
column is read as character and assigned directly to the rownames.
HTH,
Adrian
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