David Nickerson created MATH-1427:
-------------------------------------

             Summary: Unreachable statements in Complex.abs()
                 Key: MATH-1427
                 URL: https://issues.apache.org/jira/browse/MATH-1427
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.6.1
            Reporter: David Nickerson
            Priority: Minor


This return statement in Complex.abs() is unreachable:

{code:java}
if (FastMath.abs(real) < FastMath.abs(imaginary)) {
  if (imaginary == 0.0) {
    return FastMath.abs(real);
  }
{code}

If imaginary == 0, then there's no way that the preceding condition would be 
true. There are two similar inner 'if' statements that were accidentally 
switched. Returned values are still correct, but performance suffers.

The attached patch switches these back. Note that we're still protected from 
dividing by zero.




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