[Rd] factorial() not here (PR#1194)

[Warnes, Gregory R]

Its not a bug, its a feature request.  I've needed and written this simple
function a number of times and would like to have it available in a package.
Consequently, I'll add it the gregmisc package.

-Greg

 >  -----Original Message-----
 >  From: maechler@stat.math.ethz.ch [mailto:maechler@stat.math.ethz.ch]
 >  Sent: Wednesday, December 05, 2001 3:49 AM
 >  To: r-devel@stat.math.ethz.ch
 >  Cc: R-bugs@biostat.ku.dk
 >  Subject: Re: [Rd] factorial() not here (PR#1194)
 >  
 >  
 >  >>>>> "rmh" == rmh  <rmh@surfer.sbm.temple.edu> writes:
 >  
 >      rmh> Version 1.3.1 (2001-08-31) factorial() is not in R.  It
 >      rmh> is in S-Plus with the definition
 >  
 >      rmh>          factorial <- function(n) gamma(n + 1)
 >  
 >  well, and where's the bug ?  There are many more functions in S+
 >  which are not in R.  factorial() is not a blue book or white
 >  book function {of course!}; hence no direct reason to have it in R.
 >    Reversely, should we start sending bug reports to
 >  S-news or Insightful for R functions not existing in S+ ? 
 >  
 >  No, more seriously, are you really finding that factorial
 >  is hard to use via gamma?  Very often it is really logarithms
 >  one should work with anyway, hence lgamma().  Now we would also
 >  `need' lfactorial() .....
 >  
 >  Regards,
 >  Martin
 >  
 >  
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