Is there some easy and fast way to convert a sparse matrix to a dense matrix of doubles?
Because my SparseMatrix
is not sparse any more, but became dense after some matrix products.
Another question I have: The Eigen library has excellent performance, how is this possible? I don't understand why, because there are only header files, no compiled source.
Let's declare two matrices:
SparseMatrix<double> spMat;
MatrixXd dMat;
Sparse to dense:
dMat = MatrixXd(spMat);
Dense to sparse:
spMat = dMat.sparseView();