eye (MATLAB Function Reference)

Identity matrix

Syntax

Y  =  eye(n)
Y  =  eye(m,n)
Y  =  eye(size(A))

Description

Y  =  eye(n)

returns the n-by-n identity matrix.

Y  =  eye(m,n) or eye([m n])

returns an m-by-n matrix with 1's on the diagonal and 0's elsewhere.

Y  =  eye(size(A))

returns an identity matrix the same size as A.

Limitations

The identity matrix is not defined for higher-dimensional arrays. The assignment y = eye([2,3,4]) results in an error.