Hi everyone, A long time ago, Aditya Sethi <ady.sethi@gmail... wrote: > I am facing an issue upgrading numpy from 1.5.1 to 1.6.1. > In numPy 1.6, the casting behaviour for ufunc has changed and has become > stricter. > > Can someone advise how to implement the below simple example which worked in > 1.5.1 but fails in 1.6.1? > > >>> import numpy as np > >>> def add(a,b): > ... return (a+b) > >>> uadd = np.frompyfunc(add,2,1) > >>> uadd > <ufunc 'add (vectorized)'> > >>> uadd.accumulate([1,2,3]) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > ValueError: could not find a matching type for add (vectorized).accumulate, > requested type has type code 'l'
Here's the workaround I found to that problem: >>> uadd.accumulate([1,2,3], dtype='object') array([1, 3, 6], dtype=object) It seems like "accumulate" infers that 'l' is the required output dtype, but does not have the appropriate implementation: >>> uadd.types ['OO->O'] Forcing the output dtype to be 'object' (the only supported dtype) seems to do the trick. Hope this helps, -- Pascal _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion