ph-math/src/main/java/com/helger/numbercruncher/mathutils/BisectionRootFinder.java
@Override
  protected void computeNextPosition ()
  {
    m_fPrevXMid = m_fXMid;
    m_fXMid = (m_fXNeg + m_fXPos) / 2;
    m_fMid = m_aFunction.at (m_fXMid);
  }
@Override
  protected void computeNextPosition ()
  {
    m_fPrevXMid = m_fXMid;
    m_fXMid = (m_fXNeg + m_fXPos) / 2;
    m_fMid = m_aFunction.at (m_fXMid);
  }
Compute the next position of xMid.