date operations

Thanks a lot

Envoy? de mon iPhone

Le 3 d?c. 08 ? 00:39, "jim holtman" <jholtman at gmail.com> a ?crit :
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  
<dutangc at gmail.com> 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
Cincinnati, OH
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What is the problem that you are trying to solve?

date operations

Thread (8 messages)