/*
* ComplexArray.java
*
* Copyright (c) 2002-2015 Alexei Drummond, Andrew Rambaut and Marc Suchard
*
* This file is part of BEAST.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* BEAST is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* BEAST is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with BEAST; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package dr.math;
import dr.math.matrixAlgebra.Vector;
/**
* @author Marc A. Suchard
*/
public class ComplexArray {
public final double[] real;
public final double[] complex;
public final int length;
public ComplexArray(double[] real) {
this(real, new double[real.length]);
}
public ComplexArray(double[] real, double[] complex) {
this.real = real;
this.complex = complex;
this.length = real.length;
}
public void conjugate() {
for (int i = 0; i < length; ++i) {
complex[i] = -complex[i];
}
}
public ComplexArray product(ComplexArray x) {
double[] newReal = new double[length];
double[] newComplex = new double[length];
for (int i = 0; i < length; ++i) {
// (a + bi) * (c + di) = (ac - bd) + (ad + bc)i
final double a = real[i];
final double b = complex[i];
final double c = x.real[i];
final double d = x.complex[i];
newReal[i] = a * c - b * d;
newComplex[i] = a * d + b * c;
}
return new ComplexArray(newReal, newComplex);
}
public String toString() {
return "\nReal : " + new Vector(real).toString() +
"\nComplex: " + new Vector(complex).toString();
}
public static double[] interleave(double[] real, double[] complex) {
final int length = real.length;
double[] out = new double[length * 2];
for (int i = 0; i < length; i++) {
out[2 * i] = real[i];
out[2 * i + 1] = complex[i];
}
return out;
}
}