Hi Edith, > On 2 Nov 2017, at 15:46, Edith Sotelo <sotelog.ed...@gmail.com> wrote: > > > Hi Denis, > Thank you for answering my (odd) questions... > > I think I meant that I do not see how I could pass a point that is calculated > during assembly when constructing the enrichments functions. So to pass the > point during
what do you **have to** calculate this point during assembly? If it’s just a support point of the FE basis or a vertex, surely you can get it prior to assembly. You can also use pointers to a Point<dim> in your custom function and then modify the value outside. > assembly I think I need to get to the enrichment functions that are already > in the “enrichments” vector, and this is a protected member of the > FE_Enriched class … so I was thinking to make it public… maybe you have a > different suggestion... > > I want to do this to try a couple of things.. > > * I want to test a function like this : Cos ( z) with z=sqrt ( (x-xo)^2 + > (y-yo)^2), where (xo, yo) is the point I need to pass.. > > * I would like to implement the kronecker delta property: f(x)-f(xi) where > xi is the coordinate of the dof > > > and I was also thinking that I would probably need to work with DG methods. > But I can try the 1D test you suggested first to find out the continuity of > my functions > > Thank you for your help. > > Edith > > >> On Nov 2, 2017, at 1:49 AM, Denis Davydov <davyd...@gmail.com >> <mailto:davyd...@gmail.com>> wrote: >> >> >> >> 2 нояб. 2017 г., в 2:50, Edith Sotelo <esot...@tamu.edu >> <mailto:esot...@tamu.edu>> написал(а): >> >>> Hi Denis, >>> Thank you for your answer but I still need to further understand some >>> things : >>> * I think I need to pass the point (xo) during assembly since it will >>> different for different cells ( dof coordinate or center of the cell), >> >> Unless you work with discontinuous Galerkin, then you need to be careful >> with how you use PUM. >> >> If you take a global view of the shape functions and enrich each of them >> with a a given function, it will be extremely tedious to pull of. >> >> I don’t know what you are trying to do, but I suggest to draw a 1D sketch >> with a global view to linear shape-functions and the enriched functions >> (shape functions times enrichments), try to number them and see what >> constraints you should have on DoFs to make your FE space continuous. >> >>> and I do not see how I can pass the point when declaring the function (ex. >>> Enrichment <dim> (param1,param2, etc...) ) to create >> >> See below >> >>> the FE_Enriched constructor, maybe I am missing something here. >>> >>> * The thing is that during assembly the functions are already >>> encapsulated in the “enrichments” vector and if I even create a member >>> function like Enrichment<dim>::get_point(Point<dim> & ) how do I apply it >>> to the functions that are already in the “enrichments” vector ? Maybe I can >>> make the “enrichments” vector public?... >> >> Writing out of head (there could be typos): >> >> template <int dim> >> class MyFavoriteEnrichment : public dealii::Function<dim > >> { >> public: >> MyFavoriteEnrichment(const Point<dim> &x0); >> >> } >> >> is what u need. >> Look at implementation of any dealii’s functions. >> >>> >>> Thank you for your help >>> >>> Edith >>> >>> >>> >>>> On Nov 1, 2017, at 5:29 PM, Denis Davydov <davyd...@gmail.com >>>> <mailto:davyd...@gmail.com>> wrote: >>>> >>>> Hi Edith, >>>> >>>> f(x-x0) is just your enrichment function derived from dealii::Function. So >>>> define a class which takes that extra parameter (or any number of them) >>>> and use it with FE_Enriched. >>>> Assuming that your bilinear form needs gradients, then you would need to >>>> implement gradients of your custom function so that FE_Enriched can work >>>> out chain rule for you. >>>> >>>> Cheers, >>>> Denis. >>>> >>>> On Wednesday, November 1, 2017 at 5:27:10 AM UTC+1, Edith Sotelo wrote: >>>> Hello, >>>> >>>> I would like to implement enrichment functions of this type: f(x-xo) where >>>> xo is a user defined point. It could be the center of the cell or the dof >>>> coordinate. >>>> I would like a suggestion about how to implement this, because I do not >>>> see how to pass it in the constructor since it is not a static point.I >>>> think it has to be during the assembly step, but FE_values call the >>>> enrich function with a single argument (the quadrature point). >>>> What sould be a way to do pass the addtional point? >>>> >>>> Thank you for you help. >>>> >>>> >>>> -- >>>> The deal.II project is located at http://www.dealii.org/ >>>> <http://www.dealii.org/> >>>> For mailing list/forum options, see >>>> https://groups.google.com/d/forum/dealii?hl=en >>>> <https://groups.google.com/d/forum/dealii?hl=en> >>>> --- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "deal.II User Group" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe >>>> <https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe>. >>>> To unsubscribe from this group and all its topics, send an email to >>>> dealii+unsubscr...@googlegroups.com >>>> <mailto:dealii+unsubscr...@googlegroups.com>. >>>> For more options, visit https://groups.google.com/d/optout >>>> <https://groups.google.com/d/optout>. >>> >>> Edith >>> >>> >>> >>> >>> >>> >>> >>> >>> -- >>> The deal.II project is located at http://www.dealii.org/ >>> <http://www.dealii.org/> >>> For mailing list/forum options, see >>> https://groups.google.com/d/forum/dealii?hl=en >>> <https://groups.google.com/d/forum/dealii?hl=en> >>> --- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "deal.II User Group" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe >>> <https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe>. >>> To unsubscribe from this group and all its topics, send an email to >>> dealii+unsubscr...@googlegroups.com >>> <mailto:dealii+unsubscr...@googlegroups.com>. >>> For more options, visit https://groups.google.com/d/optout >>> <https://groups.google.com/d/optout>. >> >> -- >> The deal.II project is located at http://www.dealii.org/ >> <http://www.dealii.org/> >> For mailing list/forum options, see >> https://groups.google.com/d/forum/dealii?hl=en >> <https://groups.google.com/d/forum/dealii?hl=en> >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "deal.II User Group" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe >> <https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe>. >> To unsubscribe from this group and all its topics, send an email to >> dealii+unsubscr...@googlegroups.com >> <mailto:dealii+unsubscr...@googlegroups.com>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > Edith > > > > > > > > > -- > The deal.II project is located at http://www.dealii.org/ > <http://www.dealii.org/> > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > <https://groups.google.com/d/forum/dealii?hl=en> > --- > You received this message because you are subscribed to a topic in the Google > Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe > <https://groups.google.com/d/topic/dealii/fFbITWIMW5M/unsubscribe>. > To unsubscribe from this group and all its topics, send an email to > dealii+unsubscr...@googlegroups.com > <mailto:dealii+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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. 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