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# eye

identity matrix

### Calling Sequence

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

### Arguments

- A,X
matrices, hypermatrices, or

`syslin`

lists- m,n
integer values: numbers of rows and columns for

`X`

### 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`

. In case `A`

is an hypermatrix,
`X`

will be defined as
`X(i,i,...,i) = 1`

for all `i`

from 1 to `min(size(A))`

.

`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

### History

Version | Description |

5.5.0 | Generalization to N-D hypermatrix |

## Comments

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