]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
Document changes in FE_Q and Polynomial.
authorkronbichler <kronbichler@0785d39b-7218-0410-832d-ea1e28bc413d>
Tue, 26 Jul 2011 13:05:59 +0000 (13:05 +0000)
committerkronbichler <kronbichler@0785d39b-7218-0410-832d-ea1e28bc413d>
Tue, 26 Jul 2011 13:05:59 +0000 (13:05 +0000)
git-svn-id: https://svn.dealii.org/trunk@23962 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/doc/news/changes.h

index f20f766e909c30bf3ec2725ff4f972cc688db932..be4b64a31e7b76175856a8ad313e542f7197d782 100644 (file)
@@ -221,6 +221,22 @@ should be fixed now.
 <h3>Specific improvements</h3>
 
 <ol>
+<li> Improved: Evaluation of Lagrangian basis functions has been made stable
+by exchanging polynomial evaluation from the standard form
+$a_n x^n+\ldots+a_1 x + a_0$ to a product of linear factors,
+$c (x - x_0) (x-x_1)\ldots (x-x_n)$. This ensures accurate evaluation up to
+very high order and avoids inaccuracies when using high order finite elements.
+<br>
+(Martin Kronbichler 2011/07/26)
+
+<li> Improved: The internal functions in the constructor of the FE_Q element
+have been improved for high order elements. Especially when the element is
+constructed for a 1D quadrature formula, the initialization is now much faster.
+E.g. the initialization up to order 12 in three dimension completes in less
+than a second, whereas it took hundreds of seconds before.
+<br>
+(Martin Kronbichler 2011/07/26)
+
 <li> New: There is now a class Threads::ThreadLocalStorage that allows threads
 to have their own copy of an object without having to fear interference from
 other threads in accessing this object.

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