Wilder's Moving Average

[ssijbabu]

Hi,

Can someone help me to correct this indicator.

It is showing a straight line.

Regards
Sujay

Amibroker Code:
=============
A1 = WilderMA(C, 5);

function WilderMA(Field, Period)
{
X[0] = Field[0];

for(i = 1; i < BarCount; i++)
{
X[i] = Field[i]/Period + X[i - 1] * (Period - 1)/Period;
}
return X;
}

[NinjaTrader_AdamP]

sujay,

Could you describe to me the issue a bit more here for clarification? Where did you get this indicator?

[ssijbabu]

Hi NinjaTrader_AdamP,

I wrote this indicator by modifying EMA code.

Formula:

http://search.cpan.org/dist/Finance-GeniusTrader/lib/Finance/GeniusTrader/Indicators/WWMA.pm

Problem:
This is a kind of trend indicator so it should draw a line like other moving average up and down curve.

But i am getting a horizontal straight line.

[NinjaTrader_AdamP]

Hello,

Likely the formula has an issue here. At first I thought it might be because it's only adding some small value each time, but looking at it closer I think it might be that the order these arithmetic operations are going through causes the issue. Division on computers can sometimes be funky if you aren't careful.

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems

This appears to work :

Plot0.Set(CurrentBar == 0 ? Input[0] : ((Plot0[1]*(period-1) + Input[0])/period ) );

[ssijbabu]

Hello,

Likely the formula has an issue here. At first I thought it might be because it's only adding some small value each time, but looking at it closer I think it might be that the order these arithmetic operations are going through causes the issue. Division on computers can sometimes be funky if you aren't careful.

http://en.wikipedia.org/wiki/Floating_point#Accuracy_problems

This appears to work :

Plot0.Set(CurrentBar == 0 ? Input[0] : ((Plot0[1]*(period-1) + Input[0])/period ) );

Thanks for the code Adam. Here is the indicator.