trader_rocr
(PECL trader >= 0.2.0)
trader_rocr — Rate of change ratio: (price/prevPrice)
说明
trader_rocr(array
$real, int $timePeriod = ?): array
参数
-
real -
浮点数数组。
-
timePeriod -
Number of period. Valid range from 2 to 100000.
返回值
Returns an array with calculated data or false on failure.
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User Contributed Notes 1 note
mityaev_ivan at mail dot ru ¶
8 years ago
timePeriod can be from 1 (not from 2)
Working correctly, and tis is common need to calculate change from previos period.