# len

From matlib v0.9.2
by Michael Friendly

##### Length of a Vector or Column Lengths of a Matrix

`len`

calculates the Euclidean length (also called Euclidean norm) of a vector or the
length of each column of a numeric matrix.

##### Usage

`len(X)`

##### Arguments

- X
a numeric vector or matrix

##### Value

a scalar or vector containing the length(s)

##### See Also

`norm`

for more general matrix norms

##### Examples

```
# NOT RUN {
len(1:3)
len(matrix(1:9, 3, 3))
# distance between two vectors
len(1:3 - c(1,1,1))
# }
```

*Documentation reproduced from package matlib, version 0.9.2, License: GPL (>= 2)*

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