KFuncGaussian.java

/*
 * Apache License
 * Version 2.0, January 2004
 * http://www.apache.org/licenses/
 *
 *    Copyright 2013 Aurelian Tutuianu
 *    Copyright 2014 Aurelian Tutuianu
 *    Copyright 2015 Aurelian Tutuianu
 *    Copyright 2016 Aurelian Tutuianu
 *
 *    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.
 *
 */

package rapaio.core.distributions.empirical;

import rapaio.core.distributions.Normal;

/**
 * GaussianPdf kernel function
 * <p>
 * User: <a href="mailto:padreati@yahoo.com">Aurelian Tutuianu</a>
 */
public class KFuncGaussian implements KFunc {

    private static final long serialVersionUID = 4766872325548110258L;

    private final Normal normal = new Normal();

    @Override
    public double pdf(double x, double x0, double bandwidth) {
        return normal.pdf((x - x0) / bandwidth);
    }

    @Override
    public double minValue(double x0, double bandwidth) {
        return x0 - 4 * bandwidth;
    }

    @Override
    public double getMaxValue(double x0, double bandwidth) {
        return x0 + 4 * bandwidth;
    }

    @Override
    public String summary() {
        return "KFuncGaussian(" + normal.name() + ")";
    }
}