[eigen] Sparse Matrix with block sparsity pattern

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Hi Eigen's users,

I'm currently looking for a C++ implementation of Sparse Matrices with a generic Block Sparse pattern, compatible or inspired from the Eigen library. What I mean by Block Sparse pattern is that each non-zero element belongs to a non-zero block of a given dimension. In other words, the sparsity is not element-wise but much more block-wise.

Is someone has any idea of such existing implementation?



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