title: Issue with Apache Commons Complex add() function
body: <p>So basically I am writing an android app and I notice that the add function is not working properly. When I tried testing it with</p>
  
  <pre><code>Complex dummy = Complex.ZERO;
          dummy.add(Complex.I);
          Log.i("DEBUG", "DUMMY = " + dummy);
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>I/DEBUG: DUMMY = (0.0, 0.0)
  </code></pre>
  
  <p>from Logcat. I can't seem to find what went wrong with such a simple function call.</p>
  
  <p>This is the description of the function from <a href="http://commons.apache.org/proper/commons-math/javadocs/api-3.6/org/apache/commons/math3/complex/Complex.html#add(org.apache.commons.math3.complex.Complex)" rel="nofollow noreferrer">Apache's website</a></p>
  
  <blockquote>
    <p>public Complex add(Complex addend)
                throws NullArgumentException</p>
    
    <p>Returns a Complex whose value is (this + addend). Uses the definitional formula
    (a + bi) + (c + di) = (a+c) + (b+d)i</p>
  </blockquote>