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