Thanks a lot
Envoyé de mon iPhone
Le 3 déc. 08 à 00:39, "jim holtman" <[EMAIL PROTECTED]> a écrit :
If you want to do the addition, 'unclass' the variable:
alpha2+4
[1] "2008-12-25"
alpha2 + unclass(alpha1)
[1] "2009-02-15"
On Tue, Dec 2, 2008 at 4:10 PM, Christophe Dutang
<[EMAIL PROTECTED]> wrote:
Hi all,
I'm dealing with dates in R (2.7.2), but some basic operations
raise a
warning.
Incompatible methods ("+.Date", "Ops.difftime") for "+"
I saw this topic in this mailing list, but I do not understand what
to
do...
cf. https://stat.ethz.ch/pipermail/r-help/2008-June/165842.html
Do I have to convert Dates to numeric?
Thanks in advance
Christophe
PS : R script used
alpha2=as.Date("2008-12-21")
alpha1=as.Date("2008-12-21")-as.Date("2008-10-26")
alpha1
alpha2
alpha1+alpha2
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Jim Holtman
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What is the problem that you are trying to solve?
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