Convert numeric values into binary (0/1)

Question

I have a data frame with counts of different kinds of fruits of different people. Like below

    apple  banana  orange
Tim     3       0       2
Tom     0                


        

Answer 1

Just use a comparison:

d = t(matrix(c(3,0,2,0,1,1,1,2,2), 3))
d > 0
t(matrix(as.numeric(d>0), ncol(d)))