Pivoting rows into columns

Question

Suppose (to simplify) I have a table containing some control vs. treatment data:

Which, Color, Response, Count
Control, Red, 2, 10
Control, Blue, 3, 20
Treatment         


        

Answer 1

Using the reshape package.

First, melt your data.frame:

x <- melt(df) 

Then cast:

dcast(x, Color ~ Which + variable)

Depending on which version of the reshape package you're working with it could be cast() (reshape) or dcast() (reshape2)

Voila.