2 messages · J. R. M. Hosking, Brian Ripley
Full_Name: J. R. M. Hosking Version: 1.9.0 OS: Windows 2000 Submission from: (NULL) (129.34.20.23)
dt<-as.Date("2002-03-04")-as.Date("2001-02-03")
jstr(dt)
difftime(units:days)(1) 394
summary(dt)
Error in Summary.difftime(..., na.rm = na.rm) :
sum not defined for difftime objects
When x is of class difftime, either sum(x) should be permitted or summary(x)
should not try to compute the mean.
(R 1.9.0, Windows binary from CRAN)
Where does it say that summary() can be applies to difftime objects?
Full_Name: J. R. M. Hosking Version: 1.9.0 OS: Windows 2000 Submission from: (NULL) (129.34.20.23)
dt<-as.Date("2002-03-04")-as.Date("2001-02-03")
jstr(dt)
difftime(units:days)(1) 394
summary(dt)
Error in Summary.difftime(..., na.rm = na.rm) :
sum not defined for difftime objects
When x is of class difftime, either sum(x) should be permitted or summary(x)
should not try to compute the mean.
(R 1.9.0, Windows binary from CRAN)
Brian D. Ripley, ripley@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 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595