When working with plyr I often found it useful to use adply for scalar functions that I have to apply to each and every row.
e.g.
data(iris)
library(plyr)
head(
adply(iris, 1, transform , Max.Len= max(Sepal.Length,Petal.Length))
)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species Max.Len
1 5.1 3.5 1.4 0.2 setosa 5.1
2 4.9 3.0 1.4 0.2 setosa 4.9
3 4.7 3.2 1.3 0.2 setosa 4.7
4 4.6 3.1 1.5 0.2 setosa 4.6
5 5.0 3.6 1.4 0.2 setosa 5.0
6 5.4 3.9 1.7 0.4 setosa 5.4
Now I'm using dplyr more, I'm wondering if there is a tidy/natural way to do this? As this is NOT what I want:
library(dplyr)
head(
mutate(iris, Max.Len= max(Sepal.Length,Petal.Length))
)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species Max.Len
1 5.1 3.5 1.4 0.2 setosa 7.9
2 4.9 3.0 1.4 0.2 setosa 7.9
3 4.7 3.2 1.3 0.2 setosa 7.9
4 4.6 3.1 1.5 0.2 setosa 7.9
5 5.0 3.6 1.4 0.2 setosa 7.9
6 5.4 3.9 1.7 0.4 setosa 7.9