From: John Peterson <peterson@cf...>  20050307 17:19:06

nelson writes: > hello all, > i have to solve a nonlinear reaction diffusion equation. To not use a > nonlinear solver I have to use a method in which every element have to > know the gradient of the FE space in his nodes (i use Tet4 elements) and > also know some parameter specific scalars. I have also to have the > volume of the element (which i have already done)... > > How can I do it? How can make the element aware of the problem i am > solving and of the value of the basis function on his nodes? Try looking at example 13. It shows how to compute the solution and solution gradients at the quadrature points using the basis functions. Note that for integration, you typically want to evaluate your "parameter specific scalars" at the quadrature points for purposes of integration, not the nodes. Cheers, John 