[Numpy-discussion] how to use ldexp?

hi all, I have tried the example from numpy/add_newdocs.py np.ldexp(5., 2) but instead of the 20 declared there it yields TypeError: function not supported for these types, and can't coerce safely to supported types I have tried arrays but it yields same error

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np.ldexp(np.array([5., 2.]), np.array([2, 1])) Traceback (innermost last): File "<stdin>", line 1, in <module> TypeError: function not supported for these types, and can't coerce safely to supported types

So, how can I use ldexp? np.__version__ = '1.4.0.dev6972' Thank you in advance, D.