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Using R 2.4, the following fails: setClass("testc", representation(a="ANY")) makeC <- function(myarg) new("testc", a=myarg) makeC() -> Error in initialize(value, ...) : argument "myarg" is missing, with no default On the other hand, this is OK: f <- function(a) g(b=a) g <- function(b) if(missing(b)) "missing" else "valid arg&quot...

...-The problem here is that it does not produce .dll file. I cannot find the solution to that although I tried for 2 days. --Alternatively I tried ?R CMD SHLIB COXPHmatprod24delta.c? and it produces the error: 'cygwin warning: MS-DOS style path detected: C:/PROGRA~1/R/R-212~1.0/etc/i386/Makeconf Preferred POSIX equivalent is: /cygdrive/c/PROGRA~1/R/R-212~1.0/etc/i386/Makec onf CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user's guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-p...