'x' is a matrix and not a dataframe. You should be doing
colnames(x) <- c("Date", "quarter")
x[,"Date"] <- as.Date(x[,"Date"])
It would help if you took a look at the structure you were using to
understand how to access. 'names' applied to a vector would give you
the output for 13000 more entr
This suggestion does not work. x seems to have twice the number of
entries as spl.
> x <- do.call(rbind, spl)
> names(x) <- c('Date', 'quarter')
> x$Date <- as.Date(x$Date)
Error in x$Date : $ operator is invalid for atomic vectors
> x$quarter <- as.numeric(x$quarter)
Error in x$quarter : $ operato
Try this also:
do.call(rbind, spl)
On Mon, Jan 18, 2010 at 7:48 PM, James Rome wrote:
> I successfully combined my data frames, and am now on my next hurdle.
>
> I had combined the data and quarter, and used tapply to count the
> entries for each unique date/quarter pair.
> ar= tapply(ewrgnd$gw,
Tena koe Jim
You could use unlist and matrix. For example:
> tempList
[[1]]
[1] "a" "A"
[[2]]
[1] "b" "B"
[[3]]
[1] "c" "C"
> unlist(tempList)
[1] "a" "A" "b" "B" "c" "C"
> matrix(unlist(tempList), nrow=3)
[,1] [,2]
[1,] "a" "B"
[2,] "A" "c"
[3,] "b" "C"
> matrix(unlist(tempList),
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