Java Array Scale minMaxScale(final double[] x)

Description

min Max Scale

License

Apache License

Declaration

public static double[] minMaxScale(final double[] x) 

Method Source Code

//package com.java2s;
/**//from www.j  av  a 2s.c o m
 * Tools Math
 *
 * 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.
 */

import java.util.Arrays;
import java.util.DoubleSummaryStatistics;

public class Main {
    public static double[] minMaxScale(final double[] x) {
        DoubleSummaryStatistics s = Arrays.stream(x).summaryStatistics();
        return s.getMax() == 1 && s.getMin() == 0 ? x
                : Arrays.stream(x).map(d -> (d - s.getMin()) / (s.getMax() - s.getMin())).toArray();
    }
}

Related

1. arrayScale(final Double[] first, final double scale)
2. expandToLength16(byte scaledValue[], final boolean isNegative)
3. scale(double[][] as)
4. scale(final double[] a, double scale)
5. scaleMAD(double[] data)
6. scalePoints(double[] points, int height)