lisa.pizzo/LisaPizzoExercises
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response ex6

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Gundolf Haase 2026-01-15 12:05:56 +01:00
commit 4cd85941b9
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Sheet6/Ex6A.m
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clear; clc; close all;
pList = [5, 10, 20, 100];
nIter = 9;
nIter = 5;
figure;
tiledlayout(2,2)
@ -22,6 +22,10 @@ for ip = 1:length(pList)
K(1,:) = 0;
K(1,1) = 1;
F(1) = -atan(p);
% GH: Dirichlet boundary conditions at x=+1
K(end,:) = 0;
K(end,end) = 1;
F(end) = atan(p);
u = K \ F;

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Sheet6/gh_response.txt Normal file
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h- and r-adaptivity.
A:
* h-adaptivity gets worse with increasing p (not correct)
* GH: choose nIter=1 ==> all solutions are incorrect
* GH: choose nIter=20 ==> all solutions are correct
* GH: nIter = 5 and Dirchlet bc at x=1.5 ==> aweful for p=20, 100
Integration of f(x) is not accurate enough. ==> better integration formula needed, see integral(...)
B:
* h-adaptivity is correct
C:
* r-adaptivity
looks suspicious, but similar to Mandl