ph-math/src/main/java/com/helger/numbercruncher/mathutils/BisectionRootFinder.java
@Override
  protected void checkPosition () throws AbstractRootFinder.PositionUnchangedException
  {
    if (EqualsHelper.equals (m_fXMid, m_fPrevXMid))
    {
      throw new AbstractRootFinder.PositionUnchangedException ();
    }
  }
@Override
  protected void checkPosition () throws AbstractRootFinder.PositionUnchangedException
  {
    if (EqualsHelper.equals (m_fXMid, m_fPrevXMid))
    {
      throw new AbstractRootFinder.PositionUnchangedException ();
    }
  }
Check the position of xMid.

@throws PositionUnchangedException