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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;
}
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