Peter et al
Thanks for the comments on dates. Some of the respondents missed the point,
by showing ways that I could work around the problems, when my main argument
is that one shouldn't have to work around problems. So I hereto present
round 2 of the debate.
1 Postulates
a. In my 35
Terry Therneau wrote:
b. I'd advise against numeric operation on difftime objects in general,
because of the unspecified units.
If I carry this idea forward, the R should insist that I specify units for
any variable that corresponds to a physical quantity, e.g. height or
weight, so that
On 9/17/07, Terry Therneau [EMAIL PROTECTED] wrote:
Gabor Grothendieck
as.Date(10)
You can define as.Date.numeric in your package and then it will work. zoo
has done that.
library(zoo)
as.Date(10)
This is also a nice idea. Although adding to a package is possible, it is
now very hard
On Fri, 14 Sep 2007, hadley wickham wrote:
3. temp - as.Date('1990/1/1') - as.date('1953/2/5')
sqrt(temp)
Error in Math.difftime(temp3) : sqrtnot defined for difftime objects
Minor bug: no space before the word 'not'
Major: this shouldn't fail.
Arguably, it should (Is
I wrote the date package long ago, and it has been useful. In my current task
of reunifying the R (Tom Lumley) and Splus (me) code trees for survival, I'm
removing the explicit dependence on 'date' objects from the expected survival
routines so that they better integrate. Comparison of
Terry Therneau wrote:
I wrote the date package long ago, and it has been useful. In my current
task
of reunifying the R (Tom Lumley) and Splus (me) code trees for survival, I'm
removing the explicit dependence on 'date' objects from the expected survival
routines so that they better
3. temp - as.Date('1990/1/1') - as.date('1953/2/5')
sqrt(temp)
Error in Math.difftime(temp3) : sqrtnot defined for difftime objects
Minor bug: no space before the word 'not'
Major: this shouldn't fail.
Arguably, it should (Is this a difftime object? Which units?).
On 9/14/07, Terry Therneau [EMAIL PROTECTED] wrote:
I wrote the date package long ago, and it has been useful. In my current
task
of reunifying the R (Tom Lumley) and Splus (me) code trees for survival, I'm
removing the explicit dependence on 'date' objects from the expected survival
