AS_NUMERIC and as.numeric - Could someone explain?
I knew I should have checked before I mailed that response. :-) I guess you are right and I was wrong. I don't have the opportunity to check bits of R code on the computer that I use for email this month. (I am in northern Canada and my only email connection is via a 24 Kb modem connection on a machine running Windows ME. The modem connection is metered so I don't want to download the installer for R-1.9.1 for Windows just to be able to check a few bits of code.) I'll try to stay quiet unless I'm sure of the answer.
Simon Urbanek wrote:
On Jul 1, 2004, at 6:09 AM, Douglas Bates wrote:
AS_NUMERIC in C more closely corresponds to as.double() in R All that as.numeric() in R does is assure that the result is of a numeric mode. It does not coerce integer variables to doubles.
Um... are you sure?? For the sake of lots of code I saw I hope you're wrong:
Check, for example, str(as.numeric(1:100))
Yes:
> str(as.double(1:10))
num [1:10] 1 2 3 4 5 6 7 8 9 10
> str(as.numeric(1:10))
num [1:10] 1 2 3 4 5 6 7 8 9 10
> str(1:10)
int [1:10] 1 2 3 4 5 6 7 8 9 10 And moreover:
> as.numeric
function (x, ...)
UseMethod("as.double")
<environment: namespace:base>
... admittedly I didn't answer the original question, but I suspect that
the problem lies somewhere else ...
Simon