[Numpy-discussion] Upgrade to 1.6.x: frompyfunc() ufunc casting issue

Aditya Sethi ady.sethi at gmail.com
Mon Sep 19 17:38:02 EDT 2011

Hi all,

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

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'

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