Wolfgang, is that true also for mass matrices? I’d agree with you for stiffness matrices, but I’d surprised this worked ok for mass matrices as well.
If so, I’ve always been over integrating in my life… :) L. > On 12 Apr 2019, at 21:15, Wolfgang Bangerth <[email protected]> wrote: > > On 4/12/19 8:41 AM, Robert Spartus wrote: >> >> That is some fascinating information! It seems like step-44, for >> instance, does not follow this recommendation, as there the polynomial >> degree is 2, while the quadrature degree is 3 > > Actually, Gauss quadrature with degree+1 points in each direction is > sufficient to retain the convergence order of the finite element in > question, on any kind of mesh. Using higher order quadrature formulas > might increase the *absolute accuracy*, but is not necessary for the > convergence *order*. > > Best > W. > > -- > ------------------------------------------------------------------------ > Wolfgang Bangerth email: [email protected] > 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 [email protected]. > For more options, visit 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. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
