hosking@watson.ibm.com
2004-Apr-16 18:20 UTC
[Rd] summary() with argument of class difftime (PR#6780)
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)
Prof Brian Ripley
2004-Apr-16 18:23 UTC
[Rd] summary() with argument of class difftime (PR#6780)
Where does it say that summary() can be applies to difftime objects? On Fri, 16 Apr 2004 hosking@watson.ibm.com wrote:> 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