[Numpy-discussion] Can't get ufunc to work for integers

John Salvatier jsalvati@u.washington....
Thu Jul 22 10:49:09 CDT 2010


Hello,

I am trying to learn how to create ufuncs, and I got a ufunc to compile
correctly with the signature int -> double, but I can't get it to accept any
arguments. My function is testfunc and I used NPY_INT as the first signature
and NPY_DOUBLE as the second signature. What should I look at to figure this
out?

In [10]: testfunc.types
Out[10]: ['i->d', '?->?']

In [11]: testfunc(x)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/Users/johnsalvatier/Documents/workspace/pymc_numexprtest/src/test/<ipython
console> in <module>()

TypeError: function not supported for these types, and can't coerce safely
to supported types

In [12]: x
Out[12]: array([1, 2, 3])

In [13]: x.dtype
Out[13]: dtype('int32')
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