[函数]trader_var()函数—用法及示例

(PECL trader >= 0.2.0)

trader_var — 方差

说明

trader_var(array $real, int $timePeriod = ?, float $nbDev = ?): array

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.