Add changelog.

diff --git a/doc/news/changes/incompatibilities/20180209MartinKronbichler b/doc/news/changes/incompatibilities/20180209MartinKronbichler
new file mode 100644 (file)
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+++ b/doc/news/changes/incompatibilities/20180209MartinKronbichler
@@ -0,0 +1,8 @@
+New: The class FE_DGQHermite has been switched to the more stable polynomial
+basis Polynomials::HermiteLikeInterpolation. This changes the representation
+of the numbers by the FE_DGQHermite class. The change is yet highly beneficial
+because it significantly improves the accuracy (in terms of roundoff) for this
+basis and also reduces iteration counts for some iterative solvers with simple
+preconditioner ingredients such as point-Jacobi or point-Jacobi smoothing.
+<br>
+(Martin Kronbichler, 2018/02/09)

diff --git a/doc/news/changes/minor/20171227MartinKronbichler b/doc/news/changes/minor/20171227MartinKronbichler
index 75b4080602962655061907a32f81895b1ec9f188..bc2c897adeed5eb64f85bce675deba0a9421b573 100644 (file)
--- a/doc/news/changes/minor/20171227MartinKronbichler
+++ b/doc/news/changes/minor/20171227MartinKronbichler
@@ -9,4 +9,4 @@ because only the final user code knows the properties of hardware and whether
 a particular store pattern is so large that it will not fit into caches and
 thus benefit from this optimization.
 <br>
-(Martin Kronbichler, 2017/12/01)
+(Martin Kronbichler, 2017/12/27)

diff --git a/doc/news/changes/minor/20180209MartinKronbichler b/doc/news/changes/minor/20180209MartinKronbichler
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+++ b/doc/news/changes/minor/20180209MartinKronbichler
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+New: The new polynomial class Polynomials::HermiteLikeInterpolation is a
+modification of the Hermite polynomials with good conditioning of
+interpolation for all degrees, as opposed to the
+Polynomials::HermiteInterpolation class.
+<br>
+(Anian Fuchs, Martin Kronbichler, 2018/02/09)