Examples of org.jamesii.core.math.complex.Complex

org.jamesii.core.math.complex.Complex
This class represents a complex number. It has two parts, real and imaginary. Polar coordinates are represented by modulus and argument.
This class is immutable and all arithmetic operations do not alter the object but instead return a new object with the result to allow chaining of operations. If this presents too large a performance impact it could be changed, however all of Java's numeric classes are immutable so this was done out of conformance.
This class inherits from {@link Number} although it does not strictly for thepurpose of it. {@link Number} essentially seems to be a class intended for avery small subset of numbers which does not include complex or hypercomplex numbers. Thus the methods {@link #doubleValue()}, {@link #floatValue()}, {@link #intValue()}, {@link #byteValue()}, {@link #shortValue()} and{@link #longValue()} are defined and implemented but only return the possiblytruncated or rounded real part of the complex number. This is only of limited value but done to allow subclassing {@link Number} as an indication that thisclass represents numbers. @author Johannes Rössel

        && (abs(a.getArgument() - b.getArgument()) < EPSILON);
  }


  /** Tests the {@link Complex#Complex()} constructor. */
  public void testEmptyConstructor() {
    checkFields(new Complex(), 0, 0, 0, 0);
  }

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    checkFields(new Complex(), 0, 0, 0, 0);
  }


  /** Tests the {@link Complex#Complex(double)} constructor. */
  public void testRealConstructor() {
    checkFields(new Complex(5), 5, 0, 5, 0);
    checkFields(new Complex(-2), -2, 0, 2, PI);
    checkFields(new Complex(0), 0, 0, 0, 0);
  }

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    checkFields(new Complex(0), 0, 0, 0, 0);
  }


  /** Tests the {@link Complex#Complex(double, double)} constructor. */
  public void testRealImaginaryConstructor() {
    checkFields(new Complex(1, 1), 1, 1, sqrt(2), .25 * PI);
    checkFields(new Complex(0, 4), 0, 4, 4, .5 * PI);
    checkFields(new Complex(-7, 0), -7, 0, 7, PI);
    checkFields(new Complex(0, 0), 0, 0, 0, 0);
  }

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    checkFields(new Complex(0, 0), 0, 0, 0, 0);
  }


  /** Tests the static {@link Complex#fromPolar(double, double)} method. */
  public void testFromPolar() {
    Complex c = Complex.fromPolar(5, 0);
    checkFields(c, 5, 0, 5, 0);
    c = Complex.fromPolar(4, PI / 2);
    checkFields(c, 0, 4, 4, PI / 2);
    c = Complex.fromPolar(sqrt(2), PI / 4);
    checkFields(c, 1, 1, sqrt(2), PI / 4);

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        -0.5309649149);
  }


  /** Tests the {@link Complex#negate()} method. */
  public void testNegate() {
    checkFields(new Complex(1, 2).negate(), -1, -2, sqrt(5), -2.034443936);
  }

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    checkFields(new Complex(1, 2).negate(), -1, -2, sqrt(5), -2.034443936);
  }


  /** Tests the {@link Complex#conjugate()} method. */
  public void testConjugate() {
    checkFields(new Complex(1, 1).conjugate(), 1, -1, sqrt(2), -.25 * PI);
  }

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    checkFields(new Complex(1, 1).conjugate(), 1, -1, sqrt(2), -.25 * PI);
  }


  /** Tests the {@link Complex#add(Complex)} method. */
  public void testAdd() {
    checkFields(new Complex(1, 1).add(new Complex(7, -4)), 8, -3, sqrt(73),
        -0.3587706703);
  }

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        -0.3587706703);
  }


  /** Tests the {@link Complex#subtract(Complex)} method. */
  public void testSubtract() {
    checkFields(new Complex(1, 1).subtract(new Complex(5, -4)), -4, 5,
        sqrt(41), 2.245537269);
  }

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        sqrt(41), 2.245537269);
  }


  /** Tests the {@link Complex#multiply(double)} method. */
  public void testMultiplyReal() {
    checkFields(new Complex(1, 4).multiply(.1), .1, .4, sqrt(17) / 10,
        1.325817664);
    checkFields(new Complex(1.2, 5).multiply(8.4), 252d / 25, 42, 43.19266604,
        1.335251346);
  }

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        1.335251346);
  }


  /** Tests the {@link Complex#multiply(Complex)} method. */
  public void testMultiplyComplex() {
    checkFields(new Complex(7, 5).multiply(new Complex(-2, 8)), -54, 46,
        70.9365914, 2.436024476);
    checkFields(new Complex(1, 2).multiply(new Complex(0, 0)), 0, 0, 0, 0);
    checkFields(new Complex(1.2, -5).multiply(new Complex(-0.1, -4)),
        -503d / 25, -43d / 10, 20.57436269, -2.931042466);
  }

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org.jamesii.core.math.complex.TestComplex

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