[R] Capturing coxph warnings and errors

[Terry Therneau]

Error in fitter(X, Y, strats, offset, init, control, weights = weights,  :
  NA/NaN/Inf in foreign function call (arg 6)
In addition: Warning message:
In fitter(X, Y, strats, offset, init, control, weights = weights,  :
  Ran out of iterations and did not converge

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  The warning message could be ignored.  However, I am very interested in the 
error message; it is one I have not seen before.  If you could recreate the data 
set that produces it and send it to be that would be useful.
  
  	Terry Therneau
  	(author of coxph)