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numpy_eigen conversion to eigen is not working correctly #176

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fmina opened this issue Feb 14, 2017 · 0 comments · May be fixed by #177
Open

numpy_eigen conversion to eigen is not working correctly #176

fmina opened this issue Feb 14, 2017 · 0 comments · May be fixed by #177

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@fmina
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fmina commented Feb 14, 2017

If I create an eigen matrix and convert it to python object, and pass it to python function as follows

Eigen::Matrix<double, 2, 2> input;
input << 1,2,3,4;
boost::python::object PYinput(input);
boost::python::object PYoutput = my_module.attr("get_numpy_array")(PYinput);

get_numpy_array is simply returning the same matrix.

def get_numpy_array(X):
    print X #this is working ok.
    return X

Now, if I try to convert the return python object to Eigen matrix again

Eigen::Matrix<double, 2, 2> output = boost::python::extract<Eigen::Matrix<double, 2, 2>>(PYoutput);
 std::cout << output <<std::endl;

I get

4.94066e-324            1
6.95322e-310            3

I am running this on mac osx El Capitan, with python 2.7.13.

@HannesSommer @schneith any clue about this?
@fmina fmina linked a pull request Feb 14, 2017 that will close this issue
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remove 2 bytes offset from align fmina/Schweizer-Messer
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@fmina