public function SingularValueDecomposition::rank in Loft Data Grids 7.2

Same name and namespace in other branches

1. 6.2 vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/JAMA/SingularValueDecomposition.php \SingularValueDecomposition::rank()

* Effective numerical matrix rank * * @access public *

Return value

Number of nonnegligible singular values.

File

vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/JAMA/SingularValueDecomposition.php, line 514

Class

SingularValueDecomposition

@package JAMA

Code

public function rank() {
  $eps = pow(2.0, -52.0);
  $tol = max($this->m, $this->n) * $this->s[0] * $eps;
  $r = 0;
  for ($i = 0; $i < count($this->s); ++$i) {
    if ($this->s[$i] > $tol) {
      ++$r;
    }
  }
  return $r;
}