Re: pyrolite - java error if remote object includes further libs in called method

Thanks a lot!

You've made my day :-)

As in most cases I should have come across this answer on my own.

I think pyrolite is a unique possibility to seamlessly connect all the python power in scientific calculations to the java world. I am using Python with Numpy, Scipy, Matplotlib etc. as replacement for Matlab - and I am very happy with that missing nothing. Connecting Matlab to Java is a pain.

Thanks again,
Thomas

-----Ursprüngliche Nachricht-----
Von: Irmen de Jong [mailto:[email protected]] 
Gesendet: Samstag, 15. Juni 2013 18:51
An: [email protected]
Betreff: Re: [Pyro] pyrolite - java error if remote object includes further libs in called method

On 14-6-2013 22:50, Irmen de Jong wrote:
> I don't have experience with numpy though. Is list(some-numpy-type) doing something odd?
> What are the elements of the resulting list?

I've reproduced the problem and it is caused by numpy:

>>> import numpy
>>> x=numpy.array([1.0, 2.0])
>>> y=list(x)
>>> y
[1.0, 2.0]
>>> type(y[0])
<type 'numpy.float64'>
>>>

So when you return list(x) from your Pyro object, it will still contain serialized numpy
types. Pyrolite doesn't support numpy types (yet).

A workaround is to convert the numpy array to a regular Python array.array, which Pyro
(and Pyrolite) support just fine. Or use self.x.tolist() to convert the numpy array to a
regular python list where the data items are also converted to normal python types.

In the first case you'll get a double[] in Java, in the second case ArrayList<Double>.

The java exception that you got is a bit cryptic but that is due to the way the pickle
protocol works internally...


Irmen


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