eye - identity matrix

Calling Sequence

X=eye(m,n)

X=eye(A)

X=eye()

Parameters

• A,X : matrices or syslin lists
• m,n : integers

Description

according to its arguments defines an mxn matrix with 1 along the main diagonal or an identity matrix of the same dimension as A .

Caution: eye(10) is interpreted as eye(A) with A=10 i.e. 1. (It is NOT a ten by ten identity matrix!).

If A is a linear system represented by a syslin list, eye(A) returns an eye matrix of appropriate dimension: (number of outputs x number of inputs).

eye() produces a identity matrix with undefined dimensions. Dimensions will be defined when this identity matrix is added to a mtrix with fixed dimensions.

Examples

eye(2,3)
A=rand(2,3);eye(A)
s=poly(0,'s');A=[s,1;s,s+1];eye(A)
A=[1/s,1;s,2];eye(A);
A=ssrand(2,2,3);eye(A)
[1 2;3 4]+2*eye()
 

See Also

ones  zeros