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stats.php
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<?php namespace Safe; use Safe\Exceptions\StatsException; /** * Returns the covariance of a and b. * * @param array $a The first array * @param array $b The second array * @return float Returns the covariance of a and b. * @throws StatsException * */ function stats_covariance(array $a, array $b): float { error_clear_last(); $result = \stats_covariance($a, $b); if ($result === false) { throw StatsException::createFromPhpError(); } return $result; } /** * Returns the standard deviation of the values in a. * * @param array $a The array of data to find the standard deviation for. Note that all * values of the array will be cast to float. * @param bool $sample Indicates if a represents a sample of the * population; defaults to FALSE. * @return float Returns the standard deviation on success; FALSE on failure. * @throws StatsException * */ function stats_standard_deviation(array $a, bool $sample = false): float { error_clear_last(); $result = \stats_standard_deviation($a, $sample); if ($result === false) { throw StatsException::createFromPhpError(); } return $result; } /** * Returns the Pearson correlation coefficient between arr1 and arr2. * * @param array $arr1 The first array * @param array $arr2 The second array * @return float Returns the Pearson correlation coefficient between arr1 and arr2. * @throws StatsException * */ function stats_stat_correlation(array $arr1, array $arr2): float { error_clear_last(); $result = \stats_stat_correlation($arr1, $arr2); if ($result === false) { throw StatsException::createFromPhpError(); } return $result; } /** * Returns the inner product of arr1 and arr2. * * @param array $arr1 The first array * @param array $arr2 The second array * @return float Returns the inner product of arr1 and arr2. * @throws StatsException * */ function stats_stat_innerproduct(array $arr1, array $arr2): float { error_clear_last(); $result = \stats_stat_innerproduct($arr1, $arr2); if ($result === false) { throw StatsException::createFromPhpError(); } return $result; } /** * Returns the variance of the values in a. * * @param array $a The array of data to find the standard deviation for. Note that all * values of the array will be cast to float. * @param bool $sample Indicates if a represents a sample of the * population; defaults to FALSE. * @return float Returns the variance on success; FALSE on failure. * @throws StatsException * */ function stats_variance(array $a, bool $sample = false): float { error_clear_last(); $result = \stats_variance($a, $sample); if ($result === false) { throw StatsException::createFromPhpError(); } return $result; }