Identity matrix

`I = eye`

returns the scalar, `1`

.

`I = eye(`

returns
an `n`

)`n`

-by-`n`

identity matrix with
ones on the main diagonal and zeros elsewhere.

`I = eye(`

returns
a scalar, `classname`

)`1`

, where `classname`

specifies
the data type. For example, `eye('int8')`

returns
a scalar, 8-bit integer.

`I = eye('like',`

returns
a scalar, `p`

)`1`

, with the same data type, sparsity,
and complexity (real or complex) as the numeric variable, `p`

.

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