Lösungen angepasst
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\section{Aufgabe 125}
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Gegeben sei das eindeutig lösbare lineare Gleichungssystem $\ A\cdot
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Gegeben sei das eindeutig lösbare lineare Gleichungssystem $\displaystyle A\cdot
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\overrightarrow{x}=\overrightarrow{b}$ mit
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$A=\left(
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$\displaystyle A=\left(
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\begin{array}
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[c]{cccccc}%
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4 & -1 & 0 & -1 & 0 & 0\\
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\right) $
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\begin{itemize}
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\item[a.] Sei $\overrightarrow{x}^{\left( 0\right) }=\overrightarrow{0}$.
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Berechnen Sie die Näherungslösung $\overrightarrow{x}^{\left(
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\item[a.] Sei $\displaystyle \overrightarrow{x}^{\left( 0\right) }=\overrightarrow{0}$.
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Berechnen Sie die Näherungslösung $\displaystyle \overrightarrow{x}^{\left(
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3\right) }$ des Systems, die man nach 3 Schritten des
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Gesamtschrittverfahrens erhält.
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\item[b.] Zeigen Sie, daß das Gesamtschrittverfahren konvergiert.
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\item[c.] Führen Sie eine Apeoteriori-Fehlerabschätzung für
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$\overrightarrow{x}^{\left( 3\right) }$\ durch.
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$\displaystyle \overrightarrow{x}^{\left( 3\right) }$\ durch.
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\item[d.] Führen Sie eine Apriori-Fehlerabschätzung für
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$\overrightarrow{x}^{\left( 10\right) }$ durch.
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$\displaystyle \overrightarrow{x}^{\left( 10\right) }$ durch.
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\end{itemize}
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\subsection{Lösung}
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\begin{itemize}
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\item[a.] Rechenvorschriften:\newline$x_{1}^{\left( Z\right) }=\frac{1}%
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\item[a.] Rechenvorschriften:\newline$\displaystyle x_{1}^{\left( Z\right) }=\frac{1}%
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{4}\left( 2+x_{2}^{\left( Z-1\right) }+x_{4}^{\left( Z-1\right) }\right)
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=\frac{1}{2}+\frac{1}{4}x_{2}^{\left( Z-1\right) }+\frac{1}{4}x_{4}^{\left(
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Z-1\right) }$\newline$x_{2}^{\left( Z\right) }=\frac{1}{4}\left(
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Z-1\right) }$\newline$\displaystyle x_{2}^{\left( Z\right) }=\frac{1}{4}\left(
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1+x_{1}^{\left( Z-1\right) }+x_{3}^{\left( Z-1\right) }+x_{5}^{\left(
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Z-1\right) }\right) =\frac{1}{4}+\frac{1}{4}x_{1}^{\left( Z-1\right)
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}+\frac{1}{4}x_{3}^{\left( Z-1\right) }+\frac{1}{4}x_{5}^{\left(
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Z-1\right) }$\newline$x_{3}^{\left( Z\right) }=\frac{1}{4}\left(
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Z-1\right) }$\newline$\displaystyle x_{3}^{\left( Z\right) }=\frac{1}{4}\left(
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2+x_{2}^{\left( Z-1\right) }+x_{6}^{\left( Z-1\right) }\right) =\frac
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{1}{2}+\frac{1}{4}x_{2}^{\left( Z-1\right) }+\frac{1}{4}x_{6}^{\left(
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Z-1\right) }$\newline$x_{4}^{\left( Z\right) }=\frac{1}{4}\left(
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Z-1\right) }$\newline$\displaystyle x_{4}^{\left( Z\right) }=\frac{1}{4}\left(
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2+x_{1}^{\left( Z-1\right) }+x_{5}^{\left( Z-1\right) }\right) =\frac
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{1}{2}+\frac{1}{4}x_{1}^{\left( Z-1\right) }+\frac{1}{4}x_{5}^{\left(
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Z-1\right) }$\newline$x_{5}^{\left( Z\right) }=\frac{1}{4}\left(
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Z-1\right) }$\newline$\displaystyle x_{5}^{\left( Z\right) }=\frac{1}{4}\left(
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1+x_{2}^{\left( Z-1\right) }+x_{4}^{\left( Z-1\right) }+x_{6}^{\left(
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Z-1\right) }\right) =\frac{1}{4}+\frac{1}{4}x_{2}^{\left( Z-1\right)
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}+\frac{1}{4}x_{4}^{\left( Z-1\right) }+\frac{1}{4}x_{6}^{\left(
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Z-1\right) }$\newline$x_{6}^{\left( Z\right) }=\frac{1}{4}\left(
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Z-1\right) }$\newline$\displaystyle x_{6}^{\left( Z\right) }=\frac{1}{4}\left(
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2+x_{3}^{\left( Z-1\right) }+x_{5}^{\left( Z-1\right) }\right) =\frac
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{1}{2}+\frac{1}{4}x_{3}^{\left( Z-1\right) }+\frac{1}{4}x_{5}^{\left(
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Z-1\right) }$\newline\newline%
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\begin{tabular}
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[c]{l||llllll}%
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z & $x_{1}^{\left( Z\right) }$ & $x_{2}^{\left( Z\right) }$ &
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$x_{3}^{\left( Z\right) }$ & $x_{4}^{\left( Z\right) }$ & $x_{5}^{\left(
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z & $\displaystyle x_{1}^{\left( Z\right) }$ & $\displaystyle x_{2}^{\left( Z\right) }$ &
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$x_{3}^{\left( Z\right) }$ & $\displaystyle x_{4}^{\left( Z\right) }$ & $\displaystyle x_{5}^{\left(
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Z\right) }$ & $x_{6}^{\left( Z\right) }$\\\hline\hline
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1 & $0.5$ & $0.25$ & $0.5$ & $0.5$ & $0.25$ & $0.5$\\
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2 & $0.6875$ & $0.5625$ & $0.6875$ & $0.6875$ & $0.5625$ & $0.6875$\\
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