## org.apache.commons.math3.complex Class ComplexUtils

```java.lang.Object
org.apache.commons.math3.complex.ComplexUtils
```

`public class ComplexUtilsextends Object`

Static implementations of common `Complex` utilities functions.

Version:
\$Id: ComplexUtils.java 1416643 2012-12-03 19:37:14Z tn \$

Method Summary
`static Complex[]` `convertToComplex(double[] real)`
Convert an array of primitive doubles to an array of `Complex` objects.
`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)
throws MathIllegalArgumentException```
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:
`MathIllegalArgumentException` - if `r` is negative.
Since:
1.1

### convertToComplex

`public static Complex[] convertToComplex(double[] real)`
Convert an array of primitive doubles to an array of `Complex` objects.

Parameters:
`real` - Array of numbers to be converted to their `Complex` equivalent.
Returns:
an array of `Complex` objects.
Since:
3.1