numpy_cpp | Some simple header stuff to make C access to NumPy easier | Data Manipulation library

I am trying to use python 3 (with numpy) in my C++ application. This entails sending a C++ array to python, performing calculations and then retrieving the result in C++. To do this I based myself on the code that was discussed here: https://codereview.stackexchange.com/questions/92266/sending-a-c-array-to-python-numpy-and-back/92353#92353 and also here: Sending a C++ array to Python and back (Extending C++ with Numpy).

While the example from the code review post basically works I am having troubles with the return values when I modified the python and C++ script: when I am trying to return a variable that was created in python the result is a vector of nan instead of the intended computations. My guess is that the object somehow goes out of scope but I can't fix this problem.

I use the following python script in a file called mymodule.py: