Fixed issue with TemporalMLData set's index.

Author: jeffheaton

src/main/java/org/encog/ml/data/temporal/TemporalMLDataSet.java

@@ -33,6 +33,7 @@
 import org.encog.ml.data.MLDataPair;
 import org.encog.ml.data.basic.BasicMLData;
 import org.encog.ml.data.basic.BasicMLDataPair;
+import org.encog.ml.data.temporal.TemporalDataDescription.Type;
 import org.encog.neural.data.basic.BasicNeuralData;
 import org.encog.neural.data.basic.BasicNeuralDataSet;
 import org.encog.util.time.TimeSpan;
@@ -329,7 +330,14 @@ public TemporalPoint createPoint(final int sequence) {
 	private double formatData(final TemporalDataDescription desc,
 			final int index) {
 		final double[] result = new double[1];
-
+		
+		if( desc.getType()==Type.DELTA_CHANGE || desc.getType()==Type.PERCENT_CHANGE ) {
+			if (index + this.inputWindowSize > this.points.size()) {
+				throw new TemporalError("Can't generate input temporal data "
+						+ "beyond the end of provided data.");
+			}
+		}
+		
 		switch (desc.getType()) {
 		case DELTA_CHANGE:
 			result[0] = getDataDeltaChange(desc, index);
@@ -356,6 +364,7 @@ private double formatData(final TemporalDataDescription desc,
 	 */
 	public void generate() {
 		sortPoints();
+		// add one to the start index so we are "one ahead", needed to calculate DELTA, if that encoding is chosen.
 		final int start = calculateStartIndex() + 1;
 		final int setSize = calculateActualSetSize();
 		final int range = start + setSize - this.predictWindowSize
@@ -379,11 +388,6 @@ public void generate() {
 	 * @return The input neural data generated.
 	 */
 	public BasicNeuralData generateInputNeuralData(final int index) {
-		if (index + this.inputWindowSize > this.points.size()) {
-			throw new TemporalError("Can't generate input temporal data "
-					+ "beyond the end of provided data.");
-		}
-
 		final BasicNeuralData result = new BasicNeuralData(
 				this.inputNeuronCount);
 		int resultIndex = 0;
@@ -487,7 +491,10 @@ private double getDataPercentChange(final TemporalDataDescription desc,
 	 */
 	private double getDataRAW(final TemporalDataDescription desc,
 			final int index) {
-		final TemporalPoint point = this.points.get(index);
+		// Note: The reason that we subtract 1 from the index is because we are always one ahead.
+		// This allows the DELTA change formatter to work.  DELTA change requires two timeslices,
+		// so we have to be one ahead.  RAW only requires one, so we shift backwards.
+		final TemporalPoint point = this.points.get(index-1);
 		return point.getData(desc.getIndex());
 	}