Class ComplexUtils

java.lang.Object
org.apache.commons.math.complex.ComplexUtils

public class ComplexUtils extends Object
Static implementations of common Complex utilities functions.
Version:
$Revision: 990655 $ $Date: 2010-08-29 23:49:40 +0200 (dim. 29 août 2010) $
  • Method Details

    • polar2Complex

      public static Complex polar2Complex(double r, double theta)
      Creates a complex number from the given polar representation.

      The value returned is r·ei·theta, computed as r·cos(theta) + r·sin(theta)i

      If either r or theta is NaN, or theta is infinite, Complex.NaN is returned.

      If r is infinite and theta is finite, infinite or NaN values may be returned in parts of the result, following the rules for double arithmetic.

       Examples:
       
       polar2Complex(INFINITY, π/4) = INFINITY + INFINITY i
       polar2Complex(INFINITY, 0) = INFINITY + NaN i
       polar2Complex(INFINITY, -π/4) = INFINITY - INFINITY i
       polar2Complex(INFINITY, 5π/4) = -INFINITY - INFINITY i 

      Parameters:
      r - the modulus of the complex number to create
      theta - the argument of the complex number to create
      Returns:
      r·ei·theta
      Throws:
      IllegalArgumentException - if r is negative
      Since:
      1.1