trader_var
(PECL trader >= 0.2.0)
trader_var — Variance
说明
array trader_var
( array $real
[, integer $timePeriod
[, float $nbDev
]] )
参数
-
real
-
浮点数数组。
-
timePeriod
-
Number of period. Valid range from 2 to 100000.
-
nbDev
-
返回值
Returns an array with calculated data or false on failure.