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trader_ema

(PECL trader >= 0.2.0)

trader_ema — Exponential Moving Average

说明

trader_ema ( 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.

User Contributed Notes

andy at siliconrockstar dot com 01-Jun-2019 08:00


The trader_ema() function works correctly if you understand what the second argument is. The second argument is used to group the values into overlapping periods. Within the periods, the numbers undergo a simple average calculation.



So if you call trader_ema($array, 6), and your array only has six values, you're going to get back a simple average, because there is no previous data to weight the value.



If you call trader_ema($array, 3), then your six array values will be grouped into four overlapping groups of three, and you'll get back four values, each representing the EMA for that period.



Below is the output of trader_ema(array(1,2,2,1,3,4), 3) and trader_sma(array(1,2,2,1,3,4), 3). You can see the first value is the same for both the EMA and SMA calculations.



trader_ema(array(1,2,2,1,3,4), 3)



array(4) {

  [2]=>

  float(1.6666666667)

  [3]=>

  float(1.3333333333)

  [4]=>

  float(2.1666666667)

  [5]=>

  float(3.0833333333)

}



trader_sma(array(1,2,2,1,3,4), 3)



array(4) {

  [2]=>

  float(1.6666666667)

  [3]=>

  float(1.6666666667)

  [4]=>

  float(2)

  [5]=>

  float(2.6666666667)

}

Ash Christos 08-Aug-2018 07:28


This method works fine. If you're finding that the EMA and SMA results are the same, the precision setting might still be the default or not tuned to your use case. (For example floats with more than 3 levels, sathoshi's, etc) 



# this is needed for 0.00XXXXZ levels

ini_set( 'trader.real_precision', '8' );

kazemi dot milad at gmail dot com 01-Aug-2018 11:22


trader_ema in wrong calculate value 

this return just simple moving avrage 

for get ema correct use this code

$number is data array and $n is number of period

example:

$number[0]    => last value

$number[n]    =>first value



function exponentialMovingAverage(array $numbers, int $n): array

{

    $numbers=array_reverse($numbers);

    $m   = count($numbers);

    $α   = 2 / ($n + 1);

    $EMA = [];



    // Start off by seeding with the first data point

    $EMA[] = $numbers[0];



    // Each day after: EMAtoday = α?xtoday + (1-α)EMAyesterday

    for ($i = 1; $i < $m; $i++) {

        $EMA[] = ($α * $numbers[$i]) + ((1 - $α) * $EMA[$i - 1]);

    }

    $EMA=array_reverse($EMA);

    return $EMA;

}

abovesense at hotmail dot com 21-Jun-2015 08:37


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 12:07


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.

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trader_ema

说明

参数

返回值

User Contributed Notes

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