r - Select max or equal value from several columns in a data frame -


i'm trying select column highest value each row in data.frame. instance, data set such.

> df <- data.frame(one = c(0:6), 2 = c(6:0)) > df   1 2  1   0   6 2   1   5 3   2   4 4   3   3 5   4   2 6   5   1 7   6   0

then i'd set column based on rows. data frame this.

> df   1 2 rank  1   0   6    2 2   1   5    2 3   2   4    2 4   3   3    3 5   4   2    1 6   5   1    1 7   6   0    1

i imagine there sort of way can use plyr or sapply here it's eluding me @ moment.

there might more efficient solution, 

ranks <- apply(df, 1, which.max) ranks[which(df[, 1] == df[, 2])] <- 3

edit: spaced!


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