trader_var
(PECL trader >= 0.2.0)
trader_var — Variance
說明
array trader_var
( array
$real
[, integer $timePeriod
[, float $nbDev
]] )
參數
-
real -
浮點數陣列。
-
timePeriod -
Number of period. Valid range from 2 to 100000.
-
nbDev -
回傳值
Returns an array with calculated data or false on failure.
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