ph-math/src/main/java/com/helger/numbercruncher/mathutils/SecantRootFinder.java
@Override
  protected void computeNextPosition ()
  {
    m_fPrevXnp1 = m_fXnp1;
    m_fXnp1 = m_fXn - m_fFn * (m_fXnm1 - m_fXn) / (m_fFnm1 - m_fFn);
    m_fFnp1 = m_aFunction.at (m_fXnp1);
  }
@Override
  protected void computeNextPosition ()
  {
    m_fPrevXnp1 = m_fXnp1;
    m_fXnp1 = m_fXn - m_fFn * (m_fXnm1 - m_fXn) / (m_fFnm1 - m_fFn);
    m_fFnp1 = m_aFunction.at (m_fXnp1);
  }
Compute the next position of x[n+1].