[R] Using apply

Steven Yen @tyen @ending from ntu@edu@tw
Wed Oct 31 03:28:14 CET 2018

I need help with "apply". Below, I have no problem getting the column sums.
1. How do I get the sum of squares?
2. In general, where do I look up these functions?

x<-matrix(1:10,nrow=5); x
sum <- apply(x,2,sum); sum

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