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--TEST-- math_covariance() tests --FILE-- <?php $a_1 = array( 15, 16, 8, 6, 15, 12, 12, 18, 12, 20, 12, 14, ); $a_2 = array( 17.24, 15, 14.91, 4.5, 18, 6.29, 19.23, 18.69, 7.21, 42.06, 7.5, 8, ); var_dump(sprintf("%2.9f", stats_covariance($a_1, $a_2))); var_dump(stats_covariance(array(2,1), array(1))); var_dump(stats_covariance(array(), array(0))); ?> --EXPECTF-- string(12) "25.460555556" Warning: stats_covariance(): The datasets are not of the same size in %s on line %d bool(false) Warning: stats_covariance(): The first array has zero elements in %s on line %d bool(false)