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

norm(x, type = c("O", "I", "F", "M", "2"))

The default is "O".

"O", "o" or "1" specifies the one norm, (maximum absolute column sum);

"F" or "f" specifies the Frobenius norm (the Euclidean norm of x treated as if it were a vector);

norm(as.matrix(x1),"o")

The result is 6, same as norm(as.matrix(x1))

norm(as.matrix(x1),"f")

The result is sqrt(1*1+2*2+3*3)

So, norm(as.matrix(x1),"f") is answer.