[R] Kaplan-Meier survfit problem

[ericyujin99]

When I try to the code from library(survival) of library(ISwR),

the following code 

survfit(Surv(days,status==1))

that could produce Kaplan-Meier estimates shows the following error

"Error in survfit(Surv(days, status == 1)) : 
  Survfit requires a formula or a coxph fit as the first argument"

How it can be done in R.2.10
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