JSci.maths.EngineerMath Maven / Gradle / Ivy

package JSci.maths;

/**
* This class is dedicated to engineering methods applied to arrays including
* signal processing.
* All methods here are safe, that is, they create copies of arrays whenever
* necessary.
* This makes for slower methods, but the programmer can always
* define his own methods optimized for performance.
* @author Daniel Lemire
*/
public final class EngineerMath extends AbstractMath {
        private EngineerMath() {}

        /**
        * Return a running average over the data.
        * The returned array has the same size as the input array.
        * It is often used in signal processing to estimate the baseline.
        * @param v the data.
        * @param width width of the average.
        * @exception IllegalArgumentException if v.length < width
        * @exception IllegalArgumentException if width is even
        * @exception IllegalArgumentException if v.length = 0
        */
        public static double[] runningAverage(double[] v, int width) {
    if(v.length> 1;
    double[] ans=new double[v.length];
    ans[0]=ArrayMath.mean(ArrayMath.extract(0,width-1,v));
    for(int k=1;k> 1;
    double[] ans=new double[v.length];
    ans[0]=ArrayMath.median(ArrayMath.extract(0,width-1,v));
    for(int k=1;k