mathjs/docs/reference/functions/eye.md

Function eye

Create a 2-dimensional identity matrix with size m x n or n x n. The matrix has ones on the diagonal and zeros elsewhere.

Syntax

math.eye(n)
math.eye(n, format)
math.eye(m, n)
math.eye(m, n, format)
math.eye([m, n])
math.eye([m, n], format)

Parameters

Parameter	Type	Description
size	...number | Matrix | Array	The size for the matrix
format	string	The Matrix storage format

Returns

Type	Description
Matrix | Array | number	A matrix with ones on the diagonal.

Examples

math.eye(3);                    // returns [[1, 0, 0], [0, 1, 0], [0, 0, 1]]
math.eye(3, 2);                 // returns [[1, 0], [0, 1], [0, 0]]

var A = [[1, 2, 3], [4, 5, 6]];
math.eye(math.size(A));         // returns [[1, 0, 0], [0, 1, 0]]

See also

diag, ones, zeros, size, range