def _dj(scalararray):
"""Return the difference scalararray(j+1) - scalararray(j)
A priori, for internal use only.
Parameters
----------
scalararray : xarray.DataArray
xarray that should be differentiated.
Returns
-------
dj : xarray.DataArray
xarray of difference, defined at point j+1/2
"""
dj = scalararray.shift(y=-1) - scalararray
return dj
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