Message-ID: <CAHmzXO7tGBRevkQbcM_F31exmMtCgM-7HDW7d3VMzSFzO+HcJg@mail.gmail.com>
Date: 2016-08-23T22:03:15Z
From: Gang Chen
Subject: aggregate
This is a simple question: With a dataframe like the following
myData <- data.frame(X=c(1, 2, 3, 4), Y=c(4, 3, 2, 1), Z=c('A', 'A', 'B', 'B'))
how can I get the cross product between X and Y for each level of
factor Z? My difficulty is that I don't know how to deal with the fact
that crossprod() acts on two variables in this case.