What do you mean with "What I want to do with the matrix afterwards"? And I am not sure if I need it element-by-element, I just would like to implement a cheaper update method than the full recalculation.
Am Dienstag, 27. November 2018 22:21:00 UTC+1 schrieb Wolfgang Bangerth: > > On 11/27/2018 02:11 PM, 'Maxi Miller' via deal.II User Group wrote: > > I am trying to solve a system of nonlinear equations using the > > Newton-method as described in example 33. My problem is that the > > assembly of the newton matrix takes 71 % of the time of the calculations > > (for five iterations). Thus I would like to calculate this matrix once > > (at the beginning of each iteration round) and update it using Broyden's > > method for the following four iteration steps, thus decreasing the time > > needed for assembling the matrix. > > That seems reasonable. But what do you want to do with the matrix after > that? Why do you need it element-by-element? > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: bang...@colostate.edu > <javascript:> > www: http://www.math.colostate.edu/~bangerth/ > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to dealii+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
