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I want to send a numpy array to a Armadillo (C++) and output a numpy array from the C++ program. I didn't find any tutorials online for this. Can someone give me pointers on how to do this ?

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  • I'm not including code because, it is not relevant to the question and I didn't find any tutorials to try. Commented Jan 4, 2019 at 15:56
  • read up on ctypes, im guessing that's what you're after. Commented Jan 4, 2019 at 15:57
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    It is very relevant... What wrapper tool are you using for instance? Commented Jan 4, 2019 at 15:58
  • No I have code written python (numpy) and code that does stuff using armadillo in C++. I want to call the C++ function in python. But I don't know how to link them. Commented Jan 4, 2019 at 15:59
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    What wrapper tool are you using? Commented Jan 4, 2019 at 16:00

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You can rely on cython and the numpy c interface for the data conversion. There are different projects that implement this including armanpy, a library for conversion between numpy and armadillo, or mlpack, a machine learning library that uses armadillo as its data and linear algebra backend. The easiest method that I found was to use the cyarma python library, which comes with simple examples of how to access the c++ armadillo functionality from within cython.

If you want to use purely C++ (without the cython) you could implement a conversion using the boost libraries.

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first convert numpy array to c++ array and enter to armadillo and from outpu

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