Hi Support,

I have been trying to use the Ultimate Oscillator within a custom indicator but I get the runtime error message.



The problematic line is:



Note: To make sure it wasn't some unrelated coding error I adapted the OsMAIndicator.java example so that it called ULTOSC instead of MACD. It too gave the same error. That file is attached below.

What am I doing wrong?
In what way is ULTOSC different to other indicators?
Where can I find such information about the various indicators?

Thanks in advance.
John

Hello Support,

Could you please post the code of the ULTOSC indicator so that I can try to diagnose this problem myself.

Thanks!
John

Hello,
sorry for not answering.
The ULTOSC indicator is a third party indicator(https://ta-lib.org/index.html).
All our indicators are available here https://www.dukascopy.com/swiss/english/forex/jforex/forum/viewforum.php?f=6
You are receiving this exception because, you are trying to pass to a function setInputParameter as second parameter just an object. Instead you need to pass the array of objects.

Hi there,

I'm new to JForex so sorry if this is a stupid question...


The code is:

private double[][] inputs = new double[1][];
...
ind01.setInputParameter(0, inputs[0]);

I am passing an array of doubles, the same as in the tutorial "Implementing indicator that uses another indicator". I tried passing inputs which is double[ ][ ] but that resulted in other errors.

This code works with all the indicators that I have used - except for ULTOSC.

Has anyone managed to call ULTOSC from within a custom indicator?
If so I would greatly appreciate an example!

ULTOSC has input type PRICE. It needs all bar prices in array of doubles. You can define input of your custom indicator as PRICE input and pass it to the ULTOSC
You need to make this changes to your code:
1. private double[][] inputs = new double[1][];
change to
private double[][][] inputs = new double[1][][];
2. inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Input data", InputParameterInfo.Type.DOUBLE)};
change to
inputParameterInfos = new InputParameterInfo[] {new InputParameterInfo("Input data", InputParameterInfo.Type.PRICE)};
3. public void setInputParameter(int index, Object array) {
inputs[index] = (double[]) array;
}
change to
public void setInputParameter(int index, Object array) {
inputs[index] = (double[][]) array;
}

maybe more changes will be needed, but you will see it in compilation messages