R help - Apr 2000 - problem with survexp in survival5

survexp in survival5 doesn't seem to work for me.  see below:
> library(survival5)
Attaching Package "package:survival5":


	The following object(s) are masked from package:base :

	 sort.list 
> library(chron)
> data(ratetables)
> survexp(~ratetable(year=julian(6,1,1991),
+ sex=1,age=35*365.24),times=(0:30)/6*365.24)
Error in as.character(as.date(c(min(R[, 3]), max(R[, 3])))) : 
	couldn't find function "as.date"


I got the same errors from the following platforms:

R-1.0.0, survival5_1.1-1 on AIX,
R-1.0.0, survival5_1.1-5 on linux.

Chong Gu
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

On Wed, 5 Apr 2000, Chong Gu wrote:
> survexp in survival5 doesn't seem to work for me.  see below:
You need library(date), not library(chron), and the dates are on the
timebase for library(date), not library(chron).
> julian(6,1,1991)
[1] 7821
> as.numeric(mdy.date(6,1,1991))
[1] 11474
> library(survival5)
> library(date)
> data(ratetables)
> survexp(~ratetable(year=mdy.date(6,1,1991), 
+ sex=1,age=35*365.24),times=(0:30)/6*365.24)
Call:
survexp(formula = ~ratetable(year = mdy.date(6, 1, 1991), sex = 1, 
    age = 35 * 365.24), times = (0:30)/6 * 365.24)

  age ranges from 35 to 36 years
  male: 1  female: 0 
  date of entry from 1Jun91 to 1Jun91 

   Time n.risk survival
    0.0      1    1.000
   60.9      1    1.000
  121.7      1    0.999
...

That S-PLUS has altered library(chron) to have a time origin of 1/1/1960
rather than 1/1/1970 just adds to the confusion: in S-PLUS 5.1
> julian(6,1,1991)
[1] 11474

[Your example seems to have come from an outdated version of survival5,
BTW.  There is no longer a clash with sort.list.]

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._