Hi SAS-Lers,

There is a very elegant post in the R help forum.

http://tinyurl.com/2vg6qpa

http://r.789695.n4.nabble.com/Comparing-multiple-columns-in-matrix-td2237089.html#a2237089

I know this problem can be solved easily in SAS using Datastep arrays,
SQL, DOW or IML, but it is very elegant in R. What is important is the
paradigm of an in memory matrix and matrix operators. This kind of
thinking is common to SAS/IML programmers but not datastep
programmers. Also keep in mind REvolution and multitheaded row and
column operations.