eye

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.