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See the recommended documentation of this function

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()```