J {qwalkr}

The All-Ones Matrix

Description

Returns the all-ones matrix of order n.

Usage

J(n)

Arguments

n

the order of the matrix.

Value

A square matrix of order n in which every entry is equal to 1. The all-ones matrix is given by J_{n\ x\ n} = 1_{n\ x\ 1}1_{n\ x\ 1}^T.

See Also

tr(), trdot(), cartesian()

Examples

# Return the all-ones matrix of order 5.
J(5)