[R] Averaging dates?

2007-06-20 Thread Sérgio Nunes
Hi, What's the best way to average dates? I though mean.POISXct would work fine but... a [1] 2007-04-02 19:22:00 WEST b [1] 2007-03-17 16:23:00 WET class(a) [1] POSIXt POSIXct class(b) [1] POSIXt POSIXct mean(a,b) [1] 2007-04-02 19:22:00 WEST mean(b,a) [1] 2007-03-17 16:23:00 WET ?!

Re: [R] Averaging dates?

2007-06-20 Thread Achim Zeileis
On Wed, 20 Jun 2007, Sérgio Nunes wrote: Hi, What's the best way to average dates? I though mean.POISXct would work fine but... a [1] 2007-04-02 19:22:00 WEST b [1] 2007-03-17 16:23:00 WET class(a) [1] POSIXt POSIXct class(b) [1] POSIXt POSIXct mean(a,b) [1] 2007-04-02

Re: [R] Averaging dates?

2007-06-20 Thread jim holtman
You need to call 'mean.POSIXct' with a single vector: a [1] 2007-01-01 12:00:00 GMT b [1] 2007-07-01 14:22:00 GMT mean(c(a,b)) [1] 2007-04-02 01:11:00 GMT On 6/20/07, Sérgio Nunes [EMAIL PROTECTED] wrote: Hi, What's the best way to average dates? I though mean.POISXct would work fine