[Scipy-tickets] [SciPy] #496: weave not detecting numpy complex scalar (and perhaps other numpy) data types.

SciPy scipy-tickets@scipy....
Fri Sep 7 17:46:53 CDT 2007


#496: weave not detecting numpy complex scalar (and perhaps other numpy) data
types.
-------------------------+--------------------------------------------------
 Reporter:  eric         |       Owner:  eric
     Type:  defect       |      Status:  new 
 Priority:  normal       |   Milestone:  0.6 
Component:  scipy.weave  |     Version:      
 Severity:  normal       |    Keywords:      
-------------------------+--------------------------------------------------
 Here is the issue.  This one isn't detected correctly by weave.

 In [23]: a = sqrt(2) - 1j
 In [24]: type(a)
 Out[24]: <type 'numpy.complex128'>

 While this one is:

 In [25]: a=1+1j
 In [26]: type(a)
 Out[26]: <type 'complex'>
 In [27]: weave.inline("return_val = 1.0/a; ", ['a'])
 <weave: compiling>
 /home/eric/.python25_compiled/sc_76f8a7fbb0d61e690b0da4302d274e260.cpp:5:
 warning: ignoring #pragma warning
 /home/eric/.python25_compiled/sc_76f8a7fbb0d61e690b0da4302d274e260.cpp:6:
 warning: ignoring #pragma warning
 /home/eric/.python25_compiled/sc_76f8a7fbb0d61e690b0da4302d274e260.cpp: In
 function âPyObject* file_to_py(FILE*, char*, char*)â:
 /home/eric/.python25_compiled/sc_76f8a7fbb0d61e690b0da4302d274e260.cpp:403:
 warning: unused variable âpy_objâ
 Out[27]: (0.5-0.5j)

 Notice the types are different because sqrt returns a numpy scalar type.
 So, it looks like weave isn't detecting and converting the numpy types
 correctly.

 As a stop gap until this is fixed, you can cast the value back to a
 complex before calling weave.

 eric


 Peter Bienstman wrote:
 > Consider the following script:
 >
 > ------------------
 > from numpy import *
 > from scipy.weave import inline
 >
 > alpha = sqrt(2) - 1j
 >
 > inline("1.0 / alpha;", ['alpha'])
 > -------------------
 >
 > This doesn't compile:
 >
 /home/pbienst/.python24_compiled/sc_f7fc5c122cc2b740c6482ea58b8bdeb10.cpp:663:
 > error: ambiguous overload for 'operator/' in '1.0e+0 / alpha'
 >
 > Looking in the generated code, it seems weave hasn't detected that alpha
 is a
 > complex:
 >
 > py::object alpha = convert_to_catchall(py_alpha,"alpha");
 >
 > What does work is changing sqrt(2) by 1.41 or replacing 'from numpy
 import *'
 > by 'from math import *'
 >
 > Cheers,
 >
 > Peter

-- 
Ticket URL: <http://scipy.org/scipy/scipy/ticket/496>
SciPy <http://www.scipy.org/>
SciPy is open-source software for mathematics, science, and engineering.


More information about the Scipy-tickets mailing list