eye - identity matrix
according to its arguments defines an m x n 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.
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()