How to produce an R count matrix

Question

In R, I can return the count results using the specific column names I am interested in as an array as below.

require(\"plyr\")
bevs <- data.frame(cbind(n         


        

Answer 1

You want a contingency table, which you can create using table:

table(bevs[, c("name", "drink")])
#      drink
#name   cocoa coffee tea water
#  Bill     2      2   0     0
#  Llib     0      0   2     2