code: def recarraydifference(X,Y):
      
      if len(Y) > 0:
          Z = recarrayisin(X,Y)
          return X[np.invert(Z)]
      else:
          return X
docs: Records of a numpy recarray (or ndarray with structured dtype)
      that do not appear in another.
  
      Fast routine for determining which records in numpy array `X`
      do not appear in numpy recarray `Y`.
  
      Record array version of func:`tabular.fast.arraydifference`.
  
      **Parameters**
  
              **X** :  numpy recarray
  
                      Numpy recarray to comapare to numpy recarray `Y`.
                      Return subset of `X` corresponding to elements not in `Y`.
  
              **Y** :  numpy recarray
  
                      Numpy recarray to which numpy recarray `X` is compared.
                      Return subset of `X` corresponding to elements not in `Y`.
  
      **Returns**
  
              **Z** :  numpy recarray
  
                      Subset of `X` corresponding to elements not in `Y`.
  
      **See Also:**
  
              :func:`tabular.fast.arraydifference`, :func:`tabular.fast.recarrayisin`