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from numpy import * nanargmax([nan,nan]) nan # ok nanargmax([nan,nan],0) nan # ok nanargmax([[1,nan],[1,nan]],0) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python2.6/site-packages/numpy/lib/function_base.py", line 1606, in nanargmax return _nanop(np.argmax, -np.inf, a, axis) File "/usr/local/lib/python2.6/site-packages/numpy/lib/function_base.py", line 1346, in _nanop res[mask_all_along_axis] = np.nan ValueError: cannot convert float NaN to integer __version__ '2.0.0.dev-1fe8136'

D.