code: def _evalAndDer(self,x):
          '''
          Returns the level and first derivative of the function at each value in
          x.  Only called internally by HARKinterpolator1D.eval_and_der (etc).
          '''
          y,dydx = self._evalOrDer(x,True,True)
  
          return y,dydf _evalAndDer(self,x):
          '''
          Returns the level and first derivative of the function at each value in
          x.  Only called internally by HARKinterpolator1D.eval_and_der (etc).
          '''
          y,dydx = self._evalOrDer(x,True,True)
  
          return y,dydx
docs: Returns the level and first derivative of the function at each value in
          x.  Only called internally by HARKinterpolator1D.eval_and_der (etc).