Passing numpy arrays to Java using Jpype

Question

I am trying to convert a numpy array into a Java-like array using JPype's JArray command.

values = valBD.ReadAsArray()
JArray(float, values.ndim)(values)

leads to the following error message:

JArray(float, values.ndim)(values) File "c:\Python26\lib\site-packages\jpype_jarray.py", line 125, in JArray elif issubclass(t, _jclass._JAVAOBJECT):

TypeError: issubclass() arg 2 must be a class or tuple of classes

Do you habe any suggesions? Thanks a lot, Martwig

Nick ODell · Accepted Answer · 2011-05-23 19:29:44Z

2

JPype is expecting a list or list of lists, not a numpy array.

Try this:

values = valBD.ReadAsArray()
JArray(float, values.ndim)(values.tolist())

answered May 23, 2011 at 19:29

Nick ODell

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Mike Mertsock · Accepted Answer · 2013-08-03 14:20:32Z

2

The other answer doesn't work. Try this:

a = JArray(JFloat,1)([1.5,2.0])

edited Aug 3, 2013 at 14:20

Mike Mertsock

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answered Aug 3, 2013 at 14:02

asfafsasdasd

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