code: def derivative(self,x):
          '''
          Evaluates the derivative of the interpolated function at the given input.
  
          Parameters
          ----------
          x : np.array or float
              Real values to be evaluated in the interpolated function.
  
          Returns
          -------
          dydx : np.array or float
              The interpolated function's first derivative evaluated at x:
              dydx = f'(x), with the same shape as x.
          '''
          z = np.asarray(x)
          return (self._der(z.flatten())).reshape(z.shapef derivative(self,x):
          '''
          Evaluates the derivative of the interpolated function at the given input.
  
          Parameters
          ----------
          x : np.array or float
              Real values to be evaluated in the interpolated function.
  
          Returns
          -------
          dydx : np.array or float
              The interpolated function's first derivative evaluated at x:
              dydx = f'(x), with the same shape as x.
          '''
          z = np.asarray(x)
          return (self._der(z.flatten())).reshape(z.shape)
docs: Evaluates the derivative of the interpolated function at the given input.
  
          Parameters
          ----------
          x : np.array or float
              Real values to be evaluated in the interpolated function.
  
          Returns
          -------
          dydx : np.array or float
              The interpolated function's first derivative evaluated at x:
              dydx = f'(x), with the same shape as x.