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