>  Hello to everyone.
> 
>  I have this problem.
> 
>  Assume I'm building a to-Python converter for a 3x2 matrix type,
>  FORTRAN storage (these are not the real dimensions of my problem, but
>  I give these numbers only to simplify the discussion).
> 
>  Into the "convert" C++ method, first, I build a list with all the
>  matrix elements (lout);
>  then, I instantiate a boost::python::numeric::array in this way (note:
>  I had previously used
>  set_module_and_type("numpy","ndarray"), for using the NumPy's array):
> 
>  boost::python::numeric::array   v(lout)
> 
>  Finally, I'd like to call "reshape" on this array, in this way
> 
>  v.attr("reshape")(make_tuple(3,2),"F");

don't know the answer to your question, but you could do the following:

set the strides of the underlying PyArrayObject manually to match column
major format, i.e.
PyArrayObject  *v_array_obj = reinterpret_cast<PyArrayObject*>  ( v.ptr() );
v_array_obj-> strides[0] = sizeof(double);
v_array_obj-> strides[1] = 3 * sizeof(double);

hope that helps,

Sebastian


> 
>  But it does not work. It builds, but, on runtime, I obtain the error:
> 
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in ?
>  TypeError: an integer is required
> 
>  I tried to build and re-shape a matrix entirely from Python and I
>  discovered that, when using reshape,
>  you are forced to give the second parameter as
> 
>  order = 'C' or 'F'
> 
>  Now the question is: is it possible to specify a named parameter from
>  the C++ code ?
>  If the answer is "yes", how ?
> 
>  Thank you in advance,
>  Michele
> 
>  --
>  Michele De Stefano
>  http://www.linkedin.com/in/micdestefano
>  _______________________________________________
>  Cplusplus-sig mailing list
>  Cplusplus-sig@[...].org
>  http://mail.python.org/mailman/listinfo/cplusplus-sig
> 


-- 
Sebastian Walter

Institut fuer Mathematik, Humboldt-Universitaet    Tel: +49 (30) 2093-5869
Rudower Chaussee 25, Adlershof, Berlin             Fax: +49 (30) 2093-5859
Post: Unter den Linden 6, D-10099 Berlin         Email: 
walter@[...].de
WWW: http://www.mathematik.hu-berlin.de/~walter

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