(PECL stats >= 1.0.0)
stats_stat_innerproduct — Returns the inner product of two vectors
stats_stat_innerproduct ( array $arr1 , array $arr2 ) : float
Returns the inner product of arr1 and arr2.
arr1
The first array
arr2
The second array
Returns the inner product of arr1 and arr2, or false on failure.
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https://www.php.net/manual/en/function.stats-stat-innerproduct.php