eye

Identity matrix.

Syntax

Y = eye              % scalar 1
Y = eye(n)           % n×n identity
Y = eye(m, n)        % m×n with 1s on the main diagonal
Y = eye(…, classname)

Description

Returns an identity matrix — ones on the main diagonal, zeros elsewhere. Non-square shapes are allowed; the diagonal extends as far as the smaller dimension. The optional last string argument selects the element type.

Examples

eye(3)                   % 3×3 identity
eye(2, 4)                % [1 0 0 0; 0 1 0 0]
eye(3, 'int32')          % int32 identity

See also

• zeros — Array of all zeros.
• ones — Array of all ones.