If I have a dataframe which is organized like this:
name color likes?
1 sally red 0
2 sally blue 1
3 sally green 1
4 jake red 0
5 jake blue 1
6 jake green 1
7 tom red 1
8 tom blue 0
9 tom green 0
And I want to create a matrix in the form:
red blue green
sally 0 1 1
jake 0 1 1
tom 1 0 0
Are there any built-in commands that might help me do this? Also, I
can't assume that there is an observation for every person-color. In
other words, in the original dataset, there might be some colors for
which sally offered no opinion. In some cases, this may be represented
by NA, in others, it may mean that no row exists for sally for that color.
Thank you!
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