[R] tt() function (was "Package dependencies in building R packages")

Terry Therneau therneau at mayo.edu
Thu Jan 9 17:42:23 CET 2014

On 12/31/2013 05:00 AM, r-help-request at r-project.org wrote:
> Thanks for your kind response Duncan. To be more specific, I'm using the
> function mvrnorm from MASS. The issue is that MASS depends on survival and
> I have a function in my package named tt() which conflicts with a function
> in survival of the same name. I can think of 2 alternatives solutions to my
> problem, but I'm to an expert:
> 1) Copy mvrnorm into my package, which I thought was not a good idea
> 2) Rename my tt() function to something else in my package, but this is
> painful as I have it all over the place in other functions.
> Any suggestions would be much appreciated.
> Best,
> Axel.

Version 2.37-5 of survival has just been submitted to CRAN. In this new release the tt() 
function was made externally invisible, so you should not have problems.  This will take a 
few days to propogate out to the various mirrors (perhaps longer if the Windows build has 

This question of how to best deal with functions that only have meaing within a coxph 
model statement came up on R-devel just over a year ago, and I'm just now implementing the 
workaround found there.  In time the cluster(), pspline(), ridge() and frailty() functions 
are likely to receive the same treatment.

Terry T

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