[R] Sorting a dataframe

Paul, David A paulda at BATTELLE.ORG
Tue Aug 12 18:38:35 CEST 2003

Undoubtedly a simple question:

I've looked at order() and sort() in the help pages for
R1.7.1.  It doesn't appear that these functions are immediately
suited to doing the same thing as

	BY X Y Z;

in SAS.  I have also checked Frank Harrell's Hmisc library.
Could someone point me in the right direction so I can sort 
by the levels of Z within the levels of Y within the levels 
of X?  Everything needs to be in ascending order.

Much thanks in advance,
  david paul

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