Hanfei Sun - 1 year ago 286

R Question

I tried norm, but I think it gives the wrong result.(the norm of

`c(1,2,3)`

`sqrt(1*1+2*2+3*3)`

`6`

`> x1 <- 1:3`

> norm(x1)

Error in norm(x1) : 'A' must be a numeric matrix

> norm(as.matrix(x1))

[1] 6

> as.matrix(x1)

[,1]

[1,] 1

[2,] 2

[3,] 3

> norm(as.matrix(x1))

[1] 6

Does anyone know what's the function to calculate the norm of a vector in R?

Answer Source

This is a trivial function to write yourself:

```
norm_vec <- function(x) sqrt(sum(x^2))
```