Passing C++ array to python

Question

I would like to embed python into my C++ code. In C++ I am constructing a matrix and vector and would like to use Python's Numpy to solve the linear system. In order to build up to this: I am following this example: http://realgonegeek.blogspot.com/2013/08/how-to-pass-c-array-to-python-solution.html

however this particular line: import_array ();
is not working with my code. I am getting the following error:

1678:144: error: return-statement with no value, in function returning 'int' [-fpermissive] #define import_array() {if (_import_array() < 0) {PyErr_Print(); PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import"); return NUMPY_IMPORT_ARRAY_RETVAL; } }

Has anyone successfully embedded python code into their C++ code? or may know why that particular line may not work. I am using python 3.4

Your link clearly says it works for Python 3.3. Python 3.3 is very different from Python 2.7. Thus it is not surprising that the code doesn't work. — nneonneo
– nneonneo, Commented Jun 10, 2014 at 5:33

Sina M · Accepted Answer · 2022-12-05 18:15:18Z

0

one of the suggestions for that: if your matrix, vector, or array is static, you can set an argument for the c file just like this:

program.exe -array "[[2,2],[3,3],[4,4]]"

and use strtok or substr in c/c++ for splitting the string.

or if your program dynamically uses a new matrix/vector/array you can save it to a temp file or memory(C/C++) and if all above couldn't solve your problem you may finally re-write that part of the code in C++ language.

answered Dec 5, 2022 at 18:15

Sina M

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