stats_covariance
(PECL stats >= 1.0.0)
stats_covariance — Computes the covariance of two data sets
说明
stats_covariance
( array
$a
, array $b
) : float
Returns the covariance of a and b.
参数
-
a -
The first array
-
b -
The second array
返回值
Returns the covariance of a and b,
or FALSE on failure.