eye

identity matrix

Calling Sequence

X=eye(m,n)
X=eye(A)
X=eye()

Arguments

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

Description

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 matrix 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 matrix made of ones
• zeros matrix made of zeros