From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Tue, 11 Jul 2017 06:42:15 +0000 (+0200)
Subject: Add changelog
X-Git-Tag: v9.0.0-rc1~1419^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F4587%2Fhead;p=dealii.git

Add changelog
---

diff --git a/doc/news/changes/major/20170711MartinKronbichler-b b/doc/news/changes/major/20170711MartinKronbichler-b
new file mode 100644
index 0000000000..91cacbff77
--- /dev/null
+++ b/doc/news/changes/major/20170711MartinKronbichler-b
@@ -0,0 +1,6 @@
+Improved: The constructor of MappingQGeneric used a naive inversion of a cell
+Poisson matrix, which became very slow for high approximation degrees in
+3D. The implementation has been switched to the fast diagonalization method
+implemented by TensorProductMatrixSymmetricSum.
+<br>
+(Martin Kronbichler, 2017/07/11)
diff --git a/doc/news/changes/minor/20170711MartinKronbichler b/doc/news/changes/minor/20170711MartinKronbichler
new file mode 100644
index 0000000000..011d5d911a
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+++ b/doc/news/changes/minor/20170711MartinKronbichler
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+New: A new class TensorProductMatrixSymmetricSum that represents a tensor
+product of a mass and derivative matrix has been added. It implements both the
+matrix-vector operation (TensorProductMatrixSymmetricSum::vmult()) as well as
+the inverse operation (TensorProductMatrixSymmetricSum::apply_inverse())
+operation in tensorial form with optimal complexity of
+<tt>size<sup>dim+1</sup></tt> operations. The inverse operation uses the fast
+diagonalization method.
+<br>
+(Martin Kronbichler, 2017/07/11)