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# 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.

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