Hi， AT+BFT^4=C A, B, F are sparse matrices. How to solve this nonlinear problem? What kind of weak form is simplified?
And if I just want to get a vector of Jacobi matrices, what should I do? Best， FU 在 2018年11月20日星期二 UTC+8下午10:08:26，Wolfgang Bangerth写道： > > On 11/19/18 11:59 PM, FU wrote: > > How to get the derivative of a vector? > > > > > > Jacobian matrix of vectors > > T^4 is a vector. > > That's a misunderstanding. I suspect that you have a term of the form > T(x)^4 > in your PDE, but if you multiply this by test function phi_i and integrate > over the domain, you get a vector > F_i = \int_\Omega \phi_i(x) T(x)^4 dx > which is not the element-by-element fourth power of the nodal vector T > that > corresponds to T(x). > > You will want to look at how step-15 solves nonlinear problems to see how > to > approach such problems. > > 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.
