as.Date error
On Apr 17, 2011, at 7:24 PM, Wonjae Lee wrote:
Thank you for replying the as.Date error question. I have one more question as below. I used cbind command, and data x changed, 2010-11-16 to 14929, 2010-11-17 to 14930. What happened to them? What should I do to see yyyy-mm-dd format data?
x=c("11/16/2010","11/17/2010","11/18/2010","11/19/2010")
x=as.Date(x,"%m/%d/%Y")
x
[1] "2010-11-16" "2010-11-17" "2010-11-18" "2010-11-19"
y=c(1753.75,15077,1759.35,15078) cbind(x,y)
x y [1,] 14929 1753.75 [2,] 14930 15077.00 [3,] 14931 1759.35 [4,] 14932 15078.00
cbind.default will return a matrix which needs to have all of its
elements of the same type, so your dates were coerced to numeric since
their internal representation is as integers.
Had you created x as a data.frame, then cbind would have called
cbind.data.frame which was probably what you wanted to happen.
> xdat <-data.frame(x=as.Date(x,"%m/%d/%Y"))
> cbind(xdat,y)
x y
1 2010-11-16 1753.75
2 2010-11-17 15077.00
3 2010-11-18 1759.35
4 2010-11-19 15078.00
David Winsemius, MD West Hartford, CT