'Returns a new locator
(:class:`mpl_toolkits.axes_grid.axes_divider.AxesLocator`) for
specified cell.
Parameters
nx, nx1 : int
Integers specifying the column-position of the
cell. When *nx1* is None, a single *nx*-th column is
specified. Otherwise location of columns spanning between *nx*
to *nx1* (but excluding *nx1*-th column) is specified.
ny, ny1 : int
Same as *nx* and *nx1*, but for row positions.'

def new_locator(self, nx, ny, nx1=None, ny1=None):

    return AxesLocator(self, nx, ny, nx1, ny1)
