/**
* Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.analytics.financial.timeseries.returns;
import org.apache.commons.lang.Validate;
import com.opengamma.analytics.math.function.Function1D;
import com.opengamma.util.ArgumentChecker;
/**
*
*/
public class ContinuouslyCompoundedGeometricMeanReturnCalculator extends Function1D<double[], Double> {
@Override
public Double evaluate(final double[] x) {
Validate.notNull(x, "x");
ArgumentChecker.notEmpty(x, "x");
final int n = x.length;
double mult = Math.exp(x[0]);
for (int i = 1; i < n; i++) {
mult *= Math.exp(x[i]);
}
return Math.log(mult) / n;
}
}