[Rd] number of copies

[Terry Therneau]

 I'm looking at memory efficiency for some of the survival code.  The
following fragment appears in coxph.fit
    coxfit <- .C("coxfit2", iter=as.integer(maxiter),
                   as.integer(n),
                   as.integer(nvar), stime,
                   sstat,
                   x= x[sorted,] ,
	      ...

Does this make a second copy of x to pass to the routine (my
expectation) or will I end up with 3: x and x[sorted,] in the local
frame of reference, and another due to dup=TRUE?

Terry T.