calculate mean for multiple columns in data.frame

Question

Just wondering whether it is possible to calculate means for multiple columns by just using the mean function

e.g.

mean(iris[,1])

i

Answer 1

Your above solution does work assuming the columns are in the correct is.numeric format. See below example:

a <- c(1,2,3)
mean(a)

b <- c(2,4,6)
mean(b)

d <- c(3,6,9)

mydata <- cbind(b,a,d)


mean(mydata[,1:3])