tail() is broken for Surv objects, because despite Surv objects exposing
their implementation as matrices (probably a bad decision), they do not
inherit from class "matrix". One option is to make length.Surv return the
number of elements (rows in the matrix) instead of the number of cells, but
who
Running and updated Bioc 3.5:
> library(survival)
> set.seed(1)
> cens <- sample(0:1, 100, replace=TRUE)
> time <- rnorm(100)
> df = DataFrame(time=time, cens=cens, y=Surv(time, cens))
> df[1:3, ] #OK
DataFrame with 3 rows and 3 columns
time cens y.from
