[Numpy-discussion] Re: reshape and ravel methods of arrays now return views or raise error
Robert Kern
robert.kern at gmail.com
Tue Mar 28 22:11:01 CST 2006
Charles R Harris wrote:
>
>
> On 3/28/06, *Zachary Pincus* <zpincus at stanford.edu
> <mailto:zpincus at stanford.edu>> wrote:
>
> Let me give a more concrete example, pulled from some code I was
> actually using.
>
> The code is obviously a bit flawed, but it worked fine with numpy up
> until today. Now it breaks when a and b aren't both c-strided:
> def distance_squared(a, b):
> return numpy.sum( (a.ravel() - b.ravel())**2 )
>
> def distance_squared(a,b)
> return ((a - b)**2).sum()
>
> The function should probably throw an error if a and b don't have the
> same shape and order and now it does.
Does it?
In [55]: def distance_squared(a, b):
....: return ((a - b) ** 2).sum()
....:
In [56]: distance_squared(arange(5), arange(3)[:,newaxis])
Out[56]: 55
--
Robert Kern
robert.kern at gmail.com
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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