public void CanDetermineIfNaN() { var complex = new Complex(double.NaN, 1); Assert.IsTrue(complex.IsNaN(), "Real part is NaN."); complex = new Complex(1, double.NaN); Assert.IsTrue(complex.IsNaN(), "Imaginary part is NaN."); complex = new Complex(double.NaN, double.NaN); Assert.IsTrue(complex.IsNaN(), "Both parts are NaN."); }
/// <summary>Gets the degree of a sequence of coefficients which represents a polynomial. /// </summary> /// <param name="coefficients">The coefficients, where the null-based index corresponds to the power of the argument, i.e. starting from absolute coefficient, first oder coefficient etc.</param> /// <returns>The degree of the polynomial which coefficients are specified by <paramref name="coefficients"/>.</returns> /// <exception cref="ArgumentNullException">Thrown, if <paramref name="coefficients"/> is <c>null</c>.</exception> public static int GetDegree(IList <System.Numerics.Complex> coefficients) { if (coefficients == null) { throw new ArgumentNullException(nameof(coefficients), String.Format(CultureInfo.CurrentCulture, ExceptionMessages.ArgumentNull, nameof(coefficients))); } for (int j = coefficients.Count - 1; j >= 0; j--) { System.Numerics.Complex coefficient = coefficients[j]; if ((coefficient.IsNaN() == false) && (Double.IsInfinity(coefficient.Real) == false) && (Double.IsInfinity(coefficient.Imaginary) == false) && (coefficient != 0.0)) { return(j); } } return(0); }
public static void AlmostEqual(Complex expected, Complex actual) { if (expected.IsNaN() && actual.IsNaN() || expected.IsInfinity() && expected.IsInfinity()) { return; } if (!expected.Real.AlmostEqual(actual.Real)) { Assert.Fail("Real components are not equal. Expected:{0}; Actual:{1}", expected.Real, actual.Real); } if (!expected.Imaginary.AlmostEqual(actual.Imaginary)) { Assert.Fail("Imaginary components are not equal. Expected:{0}; Actual:{1}", expected.Imaginary, actual.Imaginary); } }