org.apache.commons.math.complex
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 Summary

static Complex

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

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