[Rd] data.frame backwards compatibility (PR#9601)

Full_Name: Victor Moreno Version: R2.5.0 OS: windows Submission from: (NULL) (68.40.63.169) This may not be a bug, but seems not yet documented. Some data.frames created with development version 2.5.0, when read in 2.4.1, show error: Error in dim.data.frame(chip23) : negative length vectors are

[Rd] summary of Surv object crashes R 2.2.0 (PR#8203)

Full_Name: Victor Moreno Version: 2.2.0 OS: windows Submission from: (NULL) (213.151.99.160) summary of an object class Surv (package survival) hangs and closes R 2.2.0 I would like to have Surv objects in a data frame to build models easier: t<-rexp(100) s<-rbinom(100,1,.3) surv<-Surv(t,s) x1<