trader_var

(PECL trader >= 0.2.0)

trader_var — Variance

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.