## [Libmesh-users] Questions about adaptive mesh refinement

 [Libmesh-users] Questions about adaptive mesh refinement From: Michael Povolotskyi - 2005-02-23 12:50:02 ```Hello everybody, we're going to solve nonlinear Poisson equation using the adaptive mesh refinement tools. We know that the classes for nonlinear solvers are not finished yet. However, we would like to try to solve something. For that we need to clarify some points related to the "hanging" node problem. In example #10 there is a method dof_map.constrain_element_matrix_and_vector (Ke, Fe, dof_indices). This method may reduce the size of the matrix Ke and Fe since only the independent degrees of freedom have to be left. After the linear system is solved one has to return back to DOF's with hanging nodes. Where and how is this done? Thank you, Michael. ```

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 [Libmesh-users] Questions about adaptive mesh refinement From: Michael Povolotskyi - 2005-02-23 12:50:02 ```Hello everybody, we're going to solve nonlinear Poisson equation using the adaptive mesh refinement tools. We know that the classes for nonlinear solvers are not finished yet. However, we would like to try to solve something. For that we need to clarify some points related to the "hanging" node problem. In example #10 there is a method dof_map.constrain_element_matrix_and_vector (Ke, Fe, dof_indices). This method may reduce the size of the matrix Ke and Fe since only the independent degrees of freedom have to be left. After the linear system is solved one has to return back to DOF's with hanging nodes. Where and how is this done? Thank you, Michael. ```

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