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From "Andi Vajda (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (PYLUCENE-29) JCC: JArray('int') from integer numpy ndarray not possible
Date Tue, 10 Dec 2013 13:51:12 GMT

     [ https://issues.apache.org/jira/browse/PYLUCENE-29?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andi Vajda resolved PYLUCENE-29.
--------------------------------

    Resolution: Cannot Reproduce

I installed numpy 1.8.0 via easy-install from pypi and I can't reproduce the issue. It works
fine for me with jcc 2.18, python 2.7, Oracle Java 1.7 64 bits:

  >>> import numpy as np 
  >>> from lucene import JArray, initVM
  >>> initVM()
  <jcc.JCCEnv object at 0x10029c138>
  >>> a = np.asarray([1.,2.,3.]).astype(np.double) 
  >>> a
  array([ 1.,  2.,  3.])
  >>> JArray('double')(a) 
  JArray<double>[1.0, 2.0, 3.0]
  >>> a = np.asarray([1,2,3]).astype(np.int0) 
  >>> JArray('int')(a) 
  JArray<int>[1, 2, 3]
  >>> from lucene import JCC_VERSION
  >>> JCC_VERSION
  '2.18'

> JCC: JArray('int') from integer numpy ndarray not possible
> ----------------------------------------------------------
>
>                 Key: PYLUCENE-29
>                 URL: https://issues.apache.org/jira/browse/PYLUCENE-29
>             Project: PyLucene
>          Issue Type: Bug
>         Environment: JCC-2.18, numpy-1.7.1, Java-1.7.0.25, Linux 64Bit
>            Reporter: Martin Scherer
>              Labels: jcc
>
> One can properly directly convert numpy double arrays to JArrays, but numpy integer arrays
have to be converted to a Python list before. Else one would receive a type error. The following
code snippet shows the error:
> ######
> import numpy as np
> from emma2.util.pystallone import JArray, initVM
> if __name__ == '__main__':
>     a = np.asarray([1.,2.,3.]).astype(np.double)
>     print a
>     print JArray('double')(a)
>     a = np.asarray([1,2,3]).astype(np.int0)
>     print JArray('int')(a)
> #####
> Output:
> [ 1.  2.  3.]
> JArray<double>[1.0, 2.0, 3.0]
> Traceback (most recent call last):
>   File "minimal_example_int_convert_fails.py", line 14, in <module>
>     print JArray('int')(a)
> TypeError: 1
> But this works:
> JArray('int')(a.tolist())
> Since I did not manage to figure out this behaviour, I'am filing this issue. If it has
a simple solution please let me know and close this one.
> Thanks in advance,
> Best - Martin



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