Please see the following code. I use Eigen 3.2. I believe this is a basic operation when constructing large scale matrices for optimization. Any ideas or some adapters I can use ? Thanks.

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void test_sparse_matrix ()
{
   typedef Eigen::SparseMatrix <double> _sparse ;
   _sparse m ;
   m.resize (3,4) ;
   _sparse n ; n.resize(2,2) ;

   m.block (1,1,2,2) = n; // compiling error    
}