New here - How to subtract two Indicators?

[stefy]

Hi everyone,

Just installed NJ and loving it.

I tried to build a simple custom indicator, based on the difference of two RSI (on different length), but I cannot build it using the double function:
double RS1 = RSI...
double RS2 = RSI...
double diff = RS1 - RS2

I get "Cannot implicitly convert type Ninjatrader.Indicator.RSI to double CS0029.

I understand I cannot use double to subtract two indicators, but how am I supposed to do?

Thank you everyone for help

[NinjaTrader_Dierk]

Unfortunately this is not supported. You would need to implement a custom indicator which subtracts these values data point by data point and stuffs the result in its own plot/data series.

[stefy]

Unfortunately this is not supported. You would need to implement a custom indicator which subtracts these values data point by data point and stuffs the result in its own plot/data series.

Thank you NJ_Dierk

Could you explain (with an example or with a similar indicator) how to do that?
Otherwise I don't think I will manage to move forward...

[NinjaTrader_Dierk]

I suggest ripping through our indicator code samples and the references and tips here:

http://www.ninjatrader-support.com/vb/forumdisplay.php?f=30

http://www.ninjatrader-support.com/vb/forumdisplay.php?f=31

[stefy]

Following the tutorials:

1) I introduced the variables:
#region Variables

private DataTimeSeries RSI1;
DataTimeSeries RSI2;

#endregion

2) I declared the variables:

RSI1.Set(RSI(...));
RSI2.Set(RSI(...));
RSI1 = new DateTimeSeries(this);
RSI2 = new DateTimeSeries(this);

double diff = RSI1 - RSI2;


Yet, it doesn't work!

Who can help me with an example?

Thank you everyone

[NinjaTrader_Ray]

Please import the attached via Files > Utilities and review the source code.

[stefy]

Thank you, Ray, but it doesn't work yet!
#region Variables
private DataSeries mySeries1;
DataSeries mySeries2;
#endregion

mySeries1 = new DataSeries(this);
mySeries2 = new DataSeries(this);

protected override void OnBarUpdate()
{
double myValue1 = RSI(Close, x, y);
double myValue2 = RSI(Close, x, z);
mySeries1.Set(myValue1);
mySeries2.Set(myValue2);
double Diff = myValue1 - myValue2;
Plot0.Set(Diff);
}


Please anyone can tell me what's wrong? I'm spending sooooooo much time on it, I'm getting desperate!

[NinjaTrader_Ray]

Try this:

protected override void OnBarUpdate()
{
double myValue1 = RSI(Close, x, y)[0];
double myValue2 = RSI(Close, x, z)[0];
mySeries1.Set(myValue1);
mySeries2.Set(myValue2);
double Diff = myValue1 - myValue2;
Plot0.Set(Diff);
}

however, what you are doing is redundant, I would do this and skip using any DataSeries object:

protected override void OnBarUpdate()
{
Plot0.Set(RSI(Close, x, y)[0] - RSI(Close, x, z)[0]);
}

[stefy]

I finally generated the indicator (using the latter expression you suggested), but I get a 0 flat line as indicator. Why?

Thank you

[NinjaTrader_Ray]

Since the value of the calculation is likely zero. You will need to debug it.

Here is some guidance - http://www.ninjatrader-support.com/v...ead.php?t=3418