[R] error message when plotting survival curves

[A Van Dyke]

I am trying to plot survival curves using the following code as an example:

>rs1799964.coxph<-(coxph(Surv(sassurvmonths,status)~age+stage+rs1799964_TNFA,method="efron"))

>plot(rs1799964.coxph,lyt=c(1,3),xlab="Survival in Months",ylab="Proportion
Surviving")

I am gettingthe following error message:


>Error in xy.coords(x, y, xlabel, ylabel, log) : 
  'x' and 'y' lengths differ


Any input to debugging this matter would be greatly appreciated.  Thank you
in advance.

-Alison
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