code: void log(ECoordinate v) {
  		double d = v.m_eps / v.m_value;
  		m_value = Math.log(v.m_value);
  		m_eps = d * (1.0 + 0.5 * d) + epsCoordinate() * Math.abs(m_value);
  	}
docs: Calculates natural log of v and assigns to this coordinate