[C++-sig] Accessing 2D array from python in C++

[alfa]

Hi John,

I'm sorry, I'm a bit confused because previously you said that the relevant implementation resides in "c++/myrrh/myrrh/python/multi_array_to_numpy.h"but now, you point to "src/python/man_module.cpp and src/python/multi_array_to_numpy.cpp". Hope you understand my problem of having 2D array in python that needs to be exposed/converted to C++. It would be great If I know any method/function that I can invoke from any of your implementations.

Thanks in advance.




________________________________
 From: John Reid <j.reid at mail.cryst.bbk.ac.uk>
To: cplusplus-sig at python.org 
Sent: Wednesday, August 22, 2012 12:28 PM
Subject: Re: [C++-sig] Accessing 2D array from python in C++
 
On 22/08/12 11:13, alfa wrote:
> Hi John,
> 
> Thanks a lot for your implementation. In multi_array_to_numpy.h,  can
> you give more hints on which method/function that I can possibly use if
> I can include it in my implementation as a header file.
> 
> Thanks in advance.
> 
src/python/man_module.cpp and src/python/multi_array_to_numpy.cpp
implement a boost.python module that exposes the multi-array classes.
You have choose which data types you expose multiarrays for.

HTH,
John.


> 
> ------------------------------------------------------------------------
> *From:* John Reid <j.reid at mail.cryst.bbk.ac.uk>
> *To:* cplusplus-sig at python.org
> *Sent:* Thursday, August 16, 2012 5:02 PM
> *Subject:* Re: [C++-sig] Accessing 2D array from python in C++
> 
> If you don't mind digging around in my code, you could download the
> source code for the STEME python package from pypi and look in the
> c++/myrrh directory. There is code to access multi_arrays from python in
> there.
> 
> http://pypi.python.org/pypi/STEME/
> 
> In particular the file
> c++/myrrh/myrrh/python/multi_array_to_numpy.h contains the bulk of the
> implementation.
> 
> HTH,
> John.
> 
> 
> 
> On 16/08/12 09:29, alfa wrote:
>> Hi,
>>
>> Could you give more hints on this or any code snippet that I can
>> implement this. I'm a bit naive in applying this. Please consider my 2D
>> array of Vp_cpp(Vp equivalent in Python) is as below:
>>
>>    typedef boost::multi_array<double, 2> array_type;
>>    typedef array_type::index index;
>>    array_type Vp_cpp(boost::extents[X_cpp][X_cpp]);
>>
>>
>> I'm still puzzled how to "manually wrap the features" in the last
> "..." in:
>>    boost::python::class_< boost::multi_array<...> >(...)
>>
>> Thanks in advance.
>>
>> ------------------------------------------------------------------------
>> *From:* Jim Bosch <talljimbo at gmail.com <mailto:talljimbo at gmail.com>>
>> *To:* alfa <alfarobi0161 at yahoo.com <mailto:alfarobi0161 at yahoo.com>>
>> *Cc:* Development of Python/C++ integration <cplusplus-sig at python.org
> <mailto:cplusplus-sig at python.org>>
>> *Sent:* Wednesday, August 15, 2012 5:34 PM
>> *Subject:* Re: [C++-sig] Accessing 2D array from python in C++
>>
>> On Aug 15, 2012 1:57 AM, "alfa" <alfarobi0161 at yahoo.com
> <mailto:alfarobi0161 at yahoo.com>
>> <mailto:alfarobi0161 at yahoo.com <mailto:alfarobi0161 at yahoo.com>>> wrote:
>>>
>>> I apologize for double posting this because it was spammed before.
>>>
>>> Hi Jim,
>>>
>>> Do you mean, "you could wrap multi_array itself using class_", I
>> should do as below:
>>>
>>> boost::python::class_<std::vector<std::vector<double> >
>>>("PyVec").def(boost::python::vector_indexing_suite<std::vector<std::vector<double>
>>> >());
>>>
>> No, I don't think that will work; I meant something like this:
>> boost::python::class_< boost::multi_array<...> >(...)
>>    ...;
>> Where the last "..." is where you have to manually wrap the features of
>> multi_array you want to use.  I'm afraid there's nothing as easy as
>> vector_indexing_suite.
>> Jim
>>
>>
>>
>>
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