trader_rocr

(PECL trader >= 0.2.0)

trader_rocrRate of change ratio: (price/prevPrice)

Description

array trader_rocr ( array $real [, integer $timePeriod ] )

Parameters

real

Array of real values.

timePeriod

Number of period. Valid range from 2 to 100000.

Return Values

Returns an array with calculated data or false on failure.

Коментарии

timePeriod can be from 1 (not from 2)
Working correctly, and tis is common need to calculate change from previos period.
2014-03-02 11:59:12
http://php5.kiev.ua/manual/ru/function.trader-rocr.html

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