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<?php
/**
*
* Function code for the matrix identity() function
*
* @copyright Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix)
* @license https://opensource.org/licenses/MIT MIT
*/
namespace Matrix;
/**
* Returns the identity of a matrix or an array.
*
* @param Matrix|array $matrix Matrix or an array to treat as a matrix.
* @return Matrix The identity matrix
* @throws Exception If argument isn't a valid matrix or array.
*/
function identity($matrix)
{
if (!is_object($matrix) || !($matrix instanceof Matrix)) {
$matrix = new Matrix($matrix);
}
return Functions::identity($matrix);
}
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