Fatal error: Uncaught Error: Class 'Matrix' not found in /var/www/html/colecaovirtual/lib/phpexcel/1.7.6/Classes/PHPExcel/Shared/JAMA/examples/polyfit.php:46 Stack trace: #0 {main} thrown in /var/www/html/colecaovirtual/lib/phpexcel/1.7.6/Classes/PHPExcel/Shared/JAMA/examples/polyfit.php on line 46