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.