From: leicht Date: Thu, 3 Aug 2006 08:59:23 +0000 (+0000) Subject: new functionality in DerivativeApproximation: return the full tensor of derivatives X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=482b93f0f80aeaf64b1229d72ae62c7d10f449f6;p=dealii-svn.git new functionality in DerivativeApproximation: return the full tensor of derivatives git-svn-id: https://svn.dealii.org/trunk@13584 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/doc/news/changes.html b/deal.II/doc/news/changes.html index 020989711b..bd1b167ac5 100644 --- a/deal.II/doc/news/changes.html +++ b/deal.II/doc/news/changes.html @@ -780,6 +780,36 @@ inconvenience this causes.

deal.II

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  1. + Extended: DerivativeApproximation now offers access to the + full tensor of derivatives of orders one, two and three. This + information can be requested for a single cell by means of the DerivativeApproximation::approximate_derivative_tensor function. If the + norm of this tensor is required later on, the new DerivativeApproximation::derivative_norm function can be used. Note, that + for second order derivatives, this returns the largest eigenvalue + instead of the Frobenius norm, which is returned by the Tensor<rank_,dim>::norm function. +
    + (Tobias Leicht 2006/08/03) +

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  2. + Fixed: DerivativeApproximation offers approximated + derivatives of a discrete function. The symmetrization of the derivative + tensor is now done at the right place, i.e. the derivative itself is + symmetrized instead of an intermediate tensor. This should improve the + results slightly, but cause no problems otherwise, as this is completely + internal to the class. +
    + (Tobias Leicht 2006/08/03) +

    +
  3. Fixed: The DataOut::build_patches and similar