Example usage for org.apache.commons.math3.complex Complex Complex

Introduction

In this page you can find the example usage for org.apache.commons.math3.complex Complex Complex.

Prototype

public Complex(double real, double imaginary) 

Source Link

Document

Create a complex number given the real and imaginary parts.

Usage

From source file:com.fpuna.preproceso.TestApacheMathLibDemo.java

/**
 * @param args//from w  w  w .j a  va2  s .  com
 */
public static void main(String[] args) {

    RandomGenerator randomGenerator = new JDKRandomGenerator();
    System.out.println(randomGenerator.nextInt());
    System.out.println(randomGenerator.nextDouble());

    /**
     * Descriptive Statistics like MEAN,GP,SD,MAX
    *
     */
    DescriptiveStatistics stats = new DescriptiveStatistics();
    stats.addValue(1);
    stats.addValue(2);
    stats.addValue(3);
    stats.addValue(4);
    stats.addValue(5);
    stats.addValue(6);
    stats.addValue(7);
    System.out.print("Mean : " + stats.getMean() + "\n");
    System.out.print("Standard deviation : " + stats.getStandardDeviation() + "\n");
    System.out.print("Max : " + stats.getMax() + "\n");

    /**
     * Complex number format a+bi
    *
     */
    Complex c1 = new Complex(1, 2);
    Complex c2 = new Complex(2, 3);
    System.out.print("Absolute of c1 " + c1.abs() + "\n");
    System.out.print("Addition : " + (c1.add(c2)) + "\n");
}

---

From source file:com.hurence.tmp.FFT.java

/**
 * *******************************************************************
 * Test client and sample execution/* w  ww . j ava2  s  .  c o  m*/
 *
 * % java FFT 4 x ------------------- -0.03480425839330703
 * 0.07910192950176387 0.7233322451735928 0.1659819820667019
 *
 * y = fft(x) ------------------- 0.9336118983487516 -0.7581365035668999 +
 * 0.08688005256493803i 0.44344407521182005 -0.7581365035668999 -
 * 0.08688005256493803i
 *
 * z = ifft(y) ------------------- -0.03480425839330703 0.07910192950176387
 * + 2.6599344570851287E-18i 0.7233322451735928 0.1659819820667019 -
 * 2.6599344570851287E-18i
 *
 * c = cconvolve(x, x) ------------------- 0.5506798633981853
 * 0.23461407150576394 - 4.033186818023279E-18i -0.016542951108772352
 * 0.10288019294318276 + 4.033186818023279E-18i
 *
 * d = convolve(x, x) ------------------- 0.001211336402308083 -
 * 3.122502256758253E-17i -0.005506167987577068 - 5.058885073636224E-17i
 * -0.044092969479563274 + 2.1934338938072244E-18i 0.10288019294318276 -
 * 3.6147323062478115E-17i 0.5494685269958772 + 3.122502256758253E-17i
 * 0.240120239493341 + 4.655566391833896E-17i 0.02755001837079092 -
 * 2.1934338938072244E-18i 4.01805098805014E-17i
 *
 ********************************************************************
 */
public static void main(String[] args) {
    int N = 4; //Integer.parseInt(args[0]);
    Complex[] x = new Complex[N];

    // original data
    for (int i = 0; i < N; i++) {
        x[i] = new Complex(i, 0);
        x[i] = new Complex(-2 * Math.random() + 1, 0);
    }
    show(x, "x");

    // FFT of original data
    Complex[] y = fft(x);
    show(y, "y = fft(x)");

    // take inverse FFT
    Complex[] z = ifft(y);
    show(z, "z = ifft(y)");

    // circular convolution of x with itself
    Complex[] c = cconvolve(x, x);
    show(c, "c = cconvolve(x, x)");

    // linear convolution of x with itself
    Complex[] d = convolve(x, x);
    show(d, "d = convolve(x, x)");
}

---

From source file:com.wwidesigner.geometry.calculation.Tube.java

/**
 * Calculate the impedance of an unflanged open end of a real pipe.
 * @param freq - fundamental frequency of the waveform.
 * @param radius - radius of pipe, in metres.
* @param params - physical parameters/*  w  w w .  j a  v a2  s . c om*/
 * @return impedance as seen by pipe.
 */
public static Complex calcZload_old(double freq, double radius, PhysicalParameters params) {
    Complex zRel = new Complex(9.87 * freq * radius / params.getSpeedOfSound(), 3.84)
            .multiply(freq * radius / params.getSpeedOfSound());
    return zRel.multiply(params.calcZ0(radius));
}

---

From source file:eu.itesla_project.iidm.ddb.eurostag.model.TransformerModel.java

public TransformerModel(float r, float x, float g, float b, float ratio) {
    this.z = new Complex(r, x); // z=r+jx
    this.y = new Complex(g, b); // y=g+jb
    this.ratio = ratio;
}

---

From source file:eu.itesla_project.iidm.ddb.eurostag.model.TransformerModel.java

public StateVariable toSv2(StateVariable sv1) {
    Complex s1 = new Complex(-sv1.p, -sv1.q); // s1=p1+jq1
    Complex u1 = ComplexUtils.polar2Complex(sv1.u, Math.toRadians(sv1.theta));
    Complex v1 = u1.divide(SQUARE_3); // v1=u1/sqrt(3)
    Complex v1p = v1.multiply(ratio); // v1p=v1*rho
    Complex i1 = s1.divide(v1.multiply(3)).conjugate(); // i1=conj(s1/(3*v1))
    Complex i1p = i1.divide(ratio); // i1p=i1/rho
    Complex i2 = i1p.subtract(y.multiply(v1p)).negate(); // i2=-(i1p-y*v1p)
    Complex v2 = v1p.subtract(z.multiply(i2)); // v2=v1p-z*i2
    Complex s2 = v2.multiply(3).multiply(i2.conjugate()); // s2=3*v2*conj(i2)
    Complex u2 = v2.multiply(SQUARE_3);//  w ww.j a  va  2  s  . c  o m
    return new StateVariable(-s2.getReal(), -s2.getImaginary(), u2.abs(), Math.toDegrees(u2.getArgument()));
}

---

From source file:ch.epfl.leb.sass.models.samples.internal.UniformRefractiveIndexTest.java

@Before
public void setUp() {
    expResult = new Complex(1.0, 0.5);
    refractiveIndex = new UniformRefractiveIndex(expResult);
}

---

From source file:net.sf.dsp4j.octave_3_2_4.Eig.java

public static Complex[] eig(RealMatrix d) {
    EigenDecomposition eig = new EigenDecomposition(d);
    double[] realEigenvalues = eig.getRealEigenvalues();
    double[] imagEigenvalues = eig.getImagEigenvalues();

    final Complex[] result = new Complex[realEigenvalues.length];
    for (int i = 0; i < realEigenvalues.length; i++) {
        result[i] = new Complex(realEigenvalues[i], imagEigenvalues[i]);
    }/*from   www.  j av a  2  s.co  m*/
    return result;
}

---

From source file:com.hurence.tmp.FFT.java

public static Complex[] fft(Complex[] x) {
    int N = x.length;

    // base case//from   w  w w.  j  a va2 s .c o  m
    if (N == 1) {
        return new Complex[] { x[0] };
    }

    // radix 2 Cooley-Tukey FFT
    if (N % 2 != 0) {
        throw new RuntimeException("N is not a power of 2");
    }

    // fft of even terms
    Complex[] even = new Complex[N / 2];
    for (int k = 0; k < N / 2; k++) {
        even[k] = x[2 * k];
    }
    Complex[] q = fft(even);

    // fft of odd terms
    Complex[] odd = even; // reuse the array
    for (int k = 0; k < N / 2; k++) {
        odd[k] = x[2 * k + 1];
    }
    Complex[] r = fft(odd);

    // combine
    Complex[] y = new Complex[N];
    for (int k = 0; k < N / 2; k++) {
        double kth = -2 * k * Math.PI / N;
        Complex wk = new Complex(Math.cos(kth), Math.sin(kth));
        y[k] = q[k].add(wk.multiply(r[k]));
        y[k + N / 2] = q[k].subtract(wk.multiply(r[k]));
    }
    return y;
}

---

From source file:com.interpss.pssl.test.aclf.AclfNet_Test.java

@Test
public void singlePointTest1() {
    AclfNetworkDSL netDsl = IpssAclfNet.createAclfNetwork("Sample DistNetwork");
    netDsl.baseMva(100.0);/* w  w  w .  jav  a  2 s.c om*/

    netDsl.addAclfBus("Bus1", "name-Bus 1").baseVoltage(4000.0).genCode(AclfGenCode.SWING).voltageSpec(1.0,
            UnitType.PU, 0.0, UnitType.Deg);

    netDsl.addAclfBus("Bus2", "name-Bus 2").baseVoltage(4000.0).loadCode(AclfLoadCode.CONST_P)
            .load(new Complex(1.0, 0.8), UnitType.PU);

    netDsl.addAclfBranch("Bus1", "Bus2").branchCode(AclfBranchCode.LINE).z(new Complex(0.05, 0.1), UnitType.PU);

    IpssAclf.createAclfAlgo(netDsl.getAclfNet()).lfMethod(AclfMethod.NR).tolerance(0.0001, UnitType.PU)
            .runLoadflow();

    System.out.println(AclfOutFunc.loadFlowSummary(netDsl.getAclfNet()));
}

---

From source file:com.wwidesigner.geometry.calculation.Tube.java

/**
 * Calculate the impedance of an unflanged open end of a real pipe.
 * From F. Silva, Ph. Guillemain, J. Kergomard, B. Mallaroni, A. N. Norris,
 * "Approximation formulae for the acoustic radiation impedance of a cylindrical pipe,"
 * arXiv:0811.3625v1 [physics.class-ph] 21 Nov 2008.
 * /*from  w ww.  jav  a2  s .c  o m*/
 * @param freq - fundamental frequency of the waveform.
 * @param radius - radius of pipe, in metres.
* @param params - physical parameters
 * @return impedance as seen by pipe.
 */
public static Complex calcZload(double freq, double radius, PhysicalParameters params) {
    double ka = params.calcWaveNumber(freq) * radius;
    double ka2 = ka * ka;
    double z0_denominator = params.calcZ0(radius) / (1.0 + ka2 * (0.1514 + 0.05221 * ka2));
    return new Complex(ka2 * (0.2499 + 0.05221 * ka2) * z0_denominator,
            ka * (0.6133 + 0.0381 * ka2) * z0_denominator);
}

---

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