Nothing

```
library(survival)
#
# The survival code was failing for certain data sets when called as
# survfit(Surv(time2-time1, status) ~ ......
# The issue was how tied floating point numbers are handled, and the
# fact that unique(x), factor(x) and tapply(x) are not guarranteed to
# all be the same.
# This test fails in survival 2.36-5, fixed in 2.36-6. Data sets that
# can cause it are few and far between.
#
load('ties.rda')
x <- time2 -time1
# Here is the heart of the old problem
# length(unique(x))== length(table(x))
# And the prior fix which worked ALMOST always
# x <- round(x, 15)
# length(unique(round(x,15)))== length(table(round(x,15)))
fit1 <- survfit(Surv(x) ~1)
length(fit1$time) == length(fit1$surv)
# a second test, once "rounding.R"
tdata <- data.frame(time=c(1,2, sqrt(2)^2, 2, sqrt(2)^2),
status=rep(1,5),
group=c(1,1,1,2,2))
fit <- survfit(Surv(time, status) ~ group, data=tdata)
all.equal(sum(fit$strata), length(fit$time))
```

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