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.
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