Hello everybody,
I’m a new user of JForex. I have already code something in java, but the JForex API is’nt very clear for me at this time (I need to exercise myself).
So sorry if my question seems to be a little bit simple or stupid.

I would like to calculate the derivative of a SMA with the simple formula:

Derivative = math.abs(sma[i]-sma[i-1]);

Where sma[i] is the value of sma of the lastest bar and sma[i-1] is the value os sma of the lastest bar-1.

However, I have misunderstood how to the indicators works. Anyone can give me a little exemple of code ? It will be great.

By advance, thanks !

Please consider the following code.
It computes derivative and prints it to console when a new bar is created.

package jforex.strategies;

import com.dukascopy.api.*;
import com.dukascopy.api.IIndicators.AppliedPrice;
import com.dukascopy.api.IIndicators.MaType;
import java.text.DecimalFormat;

public class MAStrategySample implements IStrategy {

    private IConsole console;
    private IIndicators indicators;
    
    @Configurable("Instrument")
    public Instrument selectedInstrument = Instrument.EURUSD;
    @Configurable("Applied price")
    public AppliedPrice appliedPrice = AppliedPrice.CLOSE;    
    @Configurable("MA type")
    public MaType maType = MaType.SMA;
    @Configurable("MA time period")
    public int maPeriod = 5;
    
    private OfferSide selectedOfferSide = OfferSide.BID;
    private Period selectedPeriod = Period.TEN_SECS;

    public void onStart(IContext context) throws JFException {
        this.indicators = context.getIndicators();
        this.console = context.getConsole();
        
        // add MA indicator to chart from strategy
        IChart chart = context.getChart(selectedInstrument);        
        if (chart != null) {
            selectedOfferSide = chart.getSelectedOfferSide();            
            selectedPeriod = chart.getSelectedPeriod();
            chart.addIndicator(indicators.getIndicator("MA"), new Object[]{maPeriod, maType.ordinal()});
        }
    }

    public void onAccount(IAccount account) throws JFException {
    }

    public void onMessage(IMessage message) throws JFException {
    }

    public void onStop() throws JFException {
    }

    public void onTick(Instrument instrument, ITick tick) throws JFException {
        if (!instrument.equals(this.selectedInstrument)) {
            return;
        }
    }

    public void onBar(Instrument instrument, Period period, IBar askBar,
            IBar bidBar) throws JFException {

        if (!instrument.equals(this.selectedInstrument)
                || !period.equals(this.selectedPeriod)) {
            return;
        }
        
        // open order signals with MA
        int barCount = 2;
        double[] ma = indicators.ma(instrument, this.selectedPeriod, selectedOfferSide, appliedPrice, maPeriod, maType, Filter.ALL_FLATS, barCount, askBar.getTime(), 0);
        // print derivative of last two bars
        printDouble(ma[1] - ma[0]);
    }

    private void printDouble(double d) {
        console.getOut().println((new DecimalFormat("#.#######")).format(d));
    }
}

Thanks a lot !
That's exactly what i wanted.