From: Martin Kronbichler Date: Tue, 5 Apr 2016 12:51:53 +0000 (+0200) Subject: Mention change X-Git-Tag: v8.5.0-rc1~1119^2~4 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b30339c9e97bb3cf5e42a94945c45ad9aaa37b7;p=dealii.git Mention change --- diff --git a/doc/news/changes.h b/doc/news/changes.h index c3b790306a..5707bee12a 100644 --- a/doc/news/changes.h +++ b/doc/news/changes.h @@ -38,6 +38,25 @@ inconvenience this causes.

    +
  1. Changed: The default nodal point distribution of FE_Q, FE_DGQ, + FE_Q_DG0, FE_Q_Bubbles, and FE_TraceQ has been changed from equidistant + points to the node points of the corresponding Gauss-Lobatto quadrature + formula. For degrees one and two, the Gauss-Lobatto quadrature is + equidistant and thus the unit support points are as before. However, the + Gauss-Lobatto points are more dense towards the element boundaries at higher + degrees. This gives well-conditioned interpolation at arbitrary orders and + much more stable computations. While these node distribution was available + before, it was not very visible and often lead to misunderstandings by + inexperienced users. Most codes will not be affected by this change, even + those using cubic and higher degree polynomials, apart from slightly + different (better) interpolation behavior and different entries in solution + vectors. If you explicitly need equidistant points, use the constructors + FE_Q(QIterated<1>(QTrapez<1>(),degree)) or + FE_DGQArbitraryNodes(QIterated<1>(QTrapez<1>(),degree)). +
    + (Martin Kronbichler, 2016/04/05) +
    2. +
  2. Removed: Support for the legacy Make.global_options file has been removed.