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\begin{document}


\setassignment
\setduedate{Wednesday, 4 November 2020, 11:55 PM}

\serieheader{Numerical Computing}{2020}{Student: Claudio Maggioni}{Discussed with: --}{Solution for Project 3}{}
\newline

\assignmentpolicy

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Install METIS 5.0.2, and the corresponding Matlab mex interface}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{Implement various graph partitioning algorithms \punkte{60}}
I summarize the various benchmark results in table \ref{table:bisection}. Please note that this table
can be generated at will with the script \texttt{ex2\_bisection\_table.m}.

\section{Visualize the Fiedler eigenvector\punkte{10}}

In figure \ref{fig:run1} there are graph outputs respectively from \textit{Grid9}, \textit{Small}, and \textit{Eppstein}.

\begin{figure}[h]
\begin{subfigure}{0.5\textwidth}
\centering
\includegraphics[trim=50 200 50 200,clip,width=\textwidth]{ex3_grid9.pdf}
	\caption{Plot for \textit{Grid9}}
\end{subfigure}
\begin{subfigure}{0.5\textwidth}
\centering
\includegraphics[trim=50 200 50 200,clip,width=\textwidth]{ex3_small.pdf}
	\caption{Plot for \textit{Small}}
\end{subfigure}
\begin{subfigure}{0.5\textwidth}
\includegraphics[trim=50 200 50 200,clip,width=\textwidth]{ex3_eppstein.pdf}
	\caption{Plot for \textit{Eppstein}}
\end{subfigure}
\caption{Graph outputs for the 3 adjacency matrices.}
\label{fig:run1}
\end{figure}

\section{Recursively bisecting meshes \punkte{20}}

Summarize your results in table \ref{table:Rec_bisection}.

\section{Compare recursive bisection to direct $k$-way partitioning\punkte{10}}

Summarize your results in table \ref{table:Compare_Metis}.

\begin{table}[h]
	\caption{Bisection results}
	\centering
	\begin{tabular}{|l|r|r|r|r|} \hline\hline
		Mesh             &  Coordinate & Metis 5.0.2  & Spectral & Inertial  \\ \hline
		grid5rect(10,100)&   10 &        10 &           10  &      10 \\
		grid5rect(100,10)&   10 &        10 &           10  &      10 \\
       grid5recRotate(100,10,-45)&   18 &        10 &           10  &      10 \\
		gridt(40)        &   58 &        58 &           58  &      58 \\
		grid9(30)        &   88 &        92 &           104 &      88 \\
		Smallmesh        &   25 &        13 &           12  &      30 \\
		Tapir            &   55 &        34 &           18  &      49 \\
		Eppstein         &   42 &        48 &           45  &      45 \\  \hline \hline
	\end{tabular}
	\label{table:bisection}
\end{table}


\begin{table}[h]
	\caption{Edge-cut results for recursive bi-partitioning.}
	\centering
	\begin{tabular}{|l|r|r|r|r|r|} \hline\hline
		Case            &  Spectral             &  Metis 5.0.2    & Coordinate & Inertial  \\ \hline
		mesh3e1         &                       &                 &            &           \\
		airfoil1        &                       &                 &            &           \\
		3elt            &                       &                 &            &           \\
		barth4          &                       &                 &            &           \\
		crack           &                       &                 &            &           \\ \hline \hline
	\end{tabular}
	\label{table:Rec_bisection}
\end{table}


\begin{table}[h]
\caption{Comparing the number of cut edges for recursive bisection and direct multiway partitioning in Metis 5.0.2.}
\centering
\begin{tabular}{|l|r|r|r|r|} \hline\hline
Partitions       &   crack          & airfoil1  \\ \hline
 16              &                       &             \\
 32              &                       &             \\ \hline \hline
\end{tabular}
\label{table:Compare_Metis}
\end{table}



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