请问amibroker的ema和sma如何实现？！

请问amibroker的ema和sma如何实现？！
因为想对ema函数做些调整，要知道amibroker里函数ema是如何实现的？哪里有相关资料？
谢谢

 

可能可以这样实现这个sma函数，还没核对数据
function fSMA(x, n,m)
{
MAVt[0]=0;
for(i=1; i<BarCount; i++)
MAVt = (m*x[i-1] + (n-m)*MAVt[i-1]) / n;
return MAVt;
}

 

借鉴的类似几个函数
http://www.amibroker.com/guide/afl/afl_view.php?id=18
output = AMA( input, factor )

is equivalent to the following looping code:

for( i = 1; i < BarCount; i++ )
{
output[ i ] = factor[ i ] * input[ i ] + ( 1 - factor[ i ] ) * output[ i - 1 ];
}


http://www.amibroker.com/guide/afl/afl_view.php?id=42
DEMA can also be implemented using new for looping:

Len = 20;
Plot( DEMA( Close, Len ), "Built-in DEMA", colorRed );

factor = 2 / (Len + 1 );

e1 = e2 = Close[ 0 ]; // initialize

for( i = 0; i < BarCount; i++ )
{
e1 = factor * Close[ i ] + ( 1 - factor ) * e1;
e2 = factor * e1 + ( 1 - factor ) * e2;

myDema[ i ] = 2 * e1 - e2;
}

Plot( myDema, "Dema in loop", colorBlue );