how to calculate the Euclidean norm of a vector in R?

Question

I tried norm, but I think it gives the wrong result. (the norm of c(1, 2, 3) is sqrt(1*1+2*2+3*3), but it returns 6..

Answer 1

I'mma throw this out there too as an equivalent R expression

norm_vec(x) <- function(x){sqrt(crossprod(x))}

Don't confuse R's crossprod with a similarly named vector/cross product. That naming is known to cause confusion especially for those with a physics/mechanics background.