From: Wolfgang Bangerth Date: Wed, 19 Aug 2015 21:17:42 +0000 (-0500) Subject: Document function arguments of DoFRenumbering::cell_wise(). X-Git-Tag: v8.4.0-rc2~583^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=62b5e97e86204d1e4d802ad83e798731f32090a5;p=dealii.git Document function arguments of DoFRenumbering::cell_wise(). --- diff --git a/include/deal.II/dofs/dof_renumbering.h b/include/deal.II/dofs/dof_renumbering.h index c8cd963cdc..f44dcddd3d 100644 --- a/include/deal.II/dofs/dof_renumbering.h +++ b/include/deal.II/dofs/dof_renumbering.h @@ -734,11 +734,27 @@ namespace DoFRenumbering hierarchical (DoFHandler &dof_handler); /** - * Cell-wise renumbering. This function takes the ordered set of cells in - * cell_order, and makes sure that all degrees of freedom in a cell - * with higher index are behind all degrees of freedom of a cell with lower - * index. The order inside a cell block will be the same as before this - * renumbering. + * Renumber degrees of freedom by cell. The function takes a vector of + * cell iterators (which needs to list all active cells of the DoF + * handler objects) and will give degrees of freedom new indices based + * on where in the given list of cells the cell is on which the degree + * of freedom is located. Degrees of freedom that exist at the interface + * between two or more cells will be numbered when they are encountered + * first. + * + * Degrees of freedom that are encountered first on the same cell + * retain their original ordering before the renumbering step. + * + * @param[in,out] dof_handler The DoFHandler whose degrees of freedom are + * to be renumbered. + * @param[in] cell_order A vector that contains the order of the cells + * that defines the order in which degrees of freedom should be + * renumbered. + * + * @pre @p cell_order must have size + * dof_handler.get_tria().n_active_cells(). Every active + * cell iterator of that triangulation needs to be present in @p cell_order + * exactly once. */ template void @@ -746,9 +762,36 @@ namespace DoFRenumbering const std::vector &cell_order); /** - * Computes the renumbering vector needed by the cell_wise() function. Does - * not perform the renumbering on the DoFHandler dofs but returns the - * renumbering vector. + * Compute a renumbering of degrees of freedom by cell. The function takes a + * vector of cell iterators (which needs to list all active cells of + * the DoF handler objects) and will give degrees of freedom new indices + * based on where in the given list of cells the cell is on which the degree + * of freedom is located. Degrees of freedom that exist at the interface + * between two or more cells will be numbered when they are encountered + * first. + * + * Degrees of freedom that are encountered first on the same cell + * retain their original ordering before the renumbering step. + * + * @param[out] renumbering A vector of length dof_handler.n_dofs() + * that contains for each degree of freedom (in their current numbering) + * their future DoF index. This vector therefore presents a + * (very particular) permutation of the current DoF indices. + * @param[out] inverse_renumbering The reverse of the permutation returned + * in the previous argument. + * @param[in] dof_handler The DoFHandler whose degrees of freedom are + * to be renumbered. + * @param[in] cell_order A vector that contains the order of the cells + * that defines the order in which degrees of freedom should be + * renumbered. + * + * @pre @p cell_order must have size + * dof_handler.get_tria().n_active_cells(). Every active + * cell iterator of that triangulation needs to be present in @p cell_order + * exactly once. + * @post For each @p i between zero and dof_handler.n_dofs(), + * the condition renumbering[inverse_renumbering[i]] == i + * will hold. */ template void @@ -758,8 +801,8 @@ namespace DoFRenumbering const std::vector &cell_order); /** - * Cell-wise renumbering on one level. See the other function with the same - * name. + * Like the other cell_wise() function, but for one level + * of a multilevel enumeration of degrees of freedom. */ template void @@ -768,9 +811,8 @@ namespace DoFRenumbering const std::vector &cell_order); /** - * Computes the renumbering vector needed by the cell_wise() level - * renumbering function. Does not perform the renumbering on the DoFHandler - * dofs but returns the renumbering vector. + * Like the other compute_cell_wise() function, but for one level + * of a multilevel enumeration of degrees of freedom. */ template void