I have an eigen sparse matrix and I would like to multiply it with a vector. However, my vector is stored in a STL vector container because of the way the whole thing is designed. So, I have something like:

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std::vector<float> values;
Eigen::SparseMatrix<float> some_mat;

....
float * vec = &values[0];



Now, is there some facility to do something like:

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some_mat * vec;


Answered there: http://stackoverflow.com/questions/2713 ... -a-c-array