/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.app.quant.indicators;
import java.util.Map;
import org.encog.app.analyst.csv.basic.BaseCachedColumn;
import org.encog.app.analyst.csv.basic.FileData;
/**
* A simple moving average.
*/
public class MovingAverage extends Indicator {
/**
* The name of this indicator.
*/
public static final String NAME = "MovAvg";
/**
* The number of periods in this indicator.
*/
private final int periods;
/**
* Construct this object.
*
* @param thePeriods
* The number of periods in this indicator.
* @param output
* True, if this indicator is predicted.
*/
public MovingAverage(final int thePeriods, final boolean output) {
super(MovingAverage.NAME, false, output);
this.periods = thePeriods;
setOutput(output);
}
/**
* Calculate this indicator.
*
* @param data
* The data to use.
* @param length
* The length to calculate over.
*/
@Override
public final void calculate(final Map<String, BaseCachedColumn> data,
final int length) {
require(data, FileData.CLOSE);
final double[] close = data.get(FileData.CLOSE).getData();
final double[] output = getData();
final int lookbackTotal = (this.periods - 1);
final int start = lookbackTotal;
if (start > (this.periods - 1)) {
return;
}
double periodTotal = 0;
int trailingIdx = start - lookbackTotal;
int i = trailingIdx;
if (this.periods > 1) {
while (i < start) {
periodTotal += close[i++];
}
}
int outIdx = this.periods - 1;
do {
periodTotal += close[i++];
final double t = periodTotal;
periodTotal -= close[trailingIdx++];
output[outIdx++] = t / this.periods;
} while (i < close.length);
setBeginningIndex(this.periods - 1);
setEndingIndex(output.length - 1);
for (i = 0; i < this.periods - 1; i++) {
output[i] = 0;
}
}
/**
* @return The number of periods in this indicator.
*/
@Override
public final int getPeriods() {
return this.periods;
}
}