JSci.maths.WaveletMath Maven / Gradle / Ivy

package JSci.maths;

/**
* The wavelet math library.
* This class cannot be subclassed or instantiated because all methods are static.
* @version 1.0
* @author Daniel Lemire
*/
public final class WaveletMath extends AbstractMath {
        private WaveletMath() {}

        /**
        * Part of the Fast Wavelet Scheme.
        * Downsampling of a set of data points in base 2
        * with an arbitrary filter using zero-padding
        * at the boundaries in 1D.
        * @return an array half the length of the input data[]
        * as long as data.length was even.
        */
        public static Complex[] downsample(Complex filter[], Complex data[]) {
                int loc=filter.length;
                int demiloc=Math.round(loc/2f-0.5f);
                int Nombre=data.length;
                int DemiNombre=Math.round(Nombre/2f-0.5f);
                Complex answer[]=new Complex[DemiNombre];
                for(int i=0;i