Re: [R] date operations

2008-12-03 Thread Gavin Simpson
On Wed, 2008-12-03 at 14:13 -0500, Gabor Grothendieck wrote: > > > > Why it works is not odd if you look at the help for ?`+.Date`, which > > shows that for this method (correct term?) we need 'date' + 'x', where > > 'date' is an object of class Date and 'x' is numeric. > > In fact what it says i

Re: [R] date operations

2008-12-03 Thread Gabor Grothendieck
On Wed, Dec 3, 2008 at 1:57 PM, Gavin Simpson <[EMAIL PROTECTED]> wrote: > On Wed, 2008-12-03 at 13:18 -0500, Gabor Grothendieck wrote: >> What is odd is that it seems to run ok if we call "+.Date" directly: >> >> > "+.Date"(alpha1, alpha2) >> [1] "2009-02-15" > > It also works if you flip the orde

Re: [R] date operations

2008-12-03 Thread Gavin Simpson
On Wed, 2008-12-03 at 13:18 -0500, Gabor Grothendieck wrote: > What is odd is that it seems to run ok if we call "+.Date" directly: > > > "+.Date"(alpha1, alpha2) > [1] "2009-02-15" It also works if you flip the ordering: > alpha2 + alpha1 [1] "2009-02-15" Warning message: Incompatible methods (

Re: [R] date operations

2008-12-03 Thread Gabor Grothendieck
What is odd is that it seems to run ok if we call "+.Date" directly: > "+.Date"(alpha1, alpha2) [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. > > Incompa

Re: [R] date operations

2008-12-03 Thread Christophe Dutang
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

Re: [R] date operations

2008-12-02 Thread jim holtman
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 > wa

Re: [R] date operations

2008-12-02 Thread jim holtman
'str' is your friend. Look at the results: > alpha2=as.Date("2008-12-21") > alpha1=as.Date("2008-12-21")-as.Date("2008-10-26") > alpha1 Time difference of 56 days > alpha2 [1] "2008-12-21" > alpha1+alpha2 Time difference of 14290 days Warning message: Incompatible methods ("Ops.difftime", "+.Date

[R] date operations

2008-12-02 Thread Christophe Dutang
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