trader_ema

(PECL trader >= 0.2.0)

trader_ema — Exponential Moving Average

说明

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

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.

User Contributed Notes

abovesense at hotmail dot com 22-Jun-2015 05:37


Hello there,

Is someone have tried the function and can tell what is the return size digits after the decimal point, meaning what is the precision of the returned  answer ?

Best,

laye

manoj dot monu23 at gmail dot com 03-Feb-2014 09:07


the trader_ema() function does'nt work correctly , it calculate just average of last period entries. Follow the following code for trader_ema:

 function EMACalculator($limit,$array)

{

    $EMA_previous_day = $array[0];

    //print_r($array);

    $multiplier1 = (2/$limit+1);

    $EMA[]=array();

    $EMA = $array[0];

    $Close= $array[1];

    

    while($limit)

{    

    //echo"EMA is $EMA\n";

    $EMA = ($Close - $EMA_previous_day) * $multiplier1 + $EMA_previous_day;

    $EMA_previous_day= $EMA;

    

    $limit--;

}

return $EMA;

}

where $limit accept the period of ema  and $array : accept array of data for ema calculation.