hi, looking at the upcasting table at http://www.scipy.org/Tentative_NumPy_Tutorial#head-4c1d53fe504adc97baf27b65513b4b97586a4fc5 I saw that int's are sometimes casted to uint's. In [3]: a = array([3],int16) In [5]: b = array([4],uint32) In [7]: a+b Out[7]: array([7], dtype=uint32) is that intended? pau