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Presentation for the seminar at MOX
author gedeone-octave <marcovass89@hotmail.it>
date Thu, 30 Jan 2014 09:14:35 +0100
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1 \documentclass[10pt]{beamer}
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4 \usetheme{Octave}
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5 \usepackage{thumbpdf}
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6 \usepackage{wasysym}
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7 \usepackage{ucs}
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8 \usepackage[utf8]{inputenc}
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9 \usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
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10 \usepackage{verbatim}
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11 \usepackage{listings}
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12 \usepackage{attachfile}
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13 \usepackage{mathtools}
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14 \usepackage{parcolumns}
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15 \usepackage[framemethod=TikZ]{mdframed}
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16 \usepackage[strict]{changepage}
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19 \lstset{
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20 language=C++,
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21 keywordstyle=\bfseries\ttfamily\color[rgb]{0,0,1},
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22 identifierstyle=\ttfamily,
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23 commentstyle=\color[rgb]{0.133,0.545,0.133},
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24 stringstyle=\ttfamily\color[rgb]{0.627,0.126,0.941},
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25 showstringspaces=false,
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33 prebreak = \raisebox{0ex}[0ex][0ex]{\ensuremath{\hookleftarrow}},
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34 breakatwhitespace=false,
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35 aboveskip={1.5\baselineskip},
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36 columns=fixed,
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37 upquote=true,
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38 extendedchars=true,
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39 }
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44 \title{Fem-fenics}
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45 \subtitle{Una libreria di elementi finiti per Octave}
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46 \author[Marco Vassallo]{\bf Marco Vassallo }
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47 \date{30 Gennaio 2014}
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48 \begin{document}
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50 \frame[plain]{\titlepage}
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51
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52 \section*{}
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53 \begin{frame}
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54 \frametitle{Outline}
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55 \tableofcontents[section=2]
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56 \end{frame}
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57
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58 \AtBeginSection[]
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59 {\frame<handout:0>{\frametitle{Outline}\tableofcontents[currentsection]}}
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61 %\AtBeginSubsection[]
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62 %{\frame<handout:0>{\frametitle{Outline}\tableofcontents[sectionstyle=show/hide,subsectionstyle=show/shaded/hide]}}
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64 \newcommand<>{\highlighton}[1]{%
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67 \newcommand{\icon}[1]{\pgfimage[height=1em]{#1}}
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71 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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72 %%%%%%%%%% Content starts here %%%%%%%%%%
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73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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75 \section{Una libreria di elementi finiti per Octave}
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76 \subsection{Introduzione}
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77 \begin{frame}[fragile]{Why?}
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78 \begin{itemize}
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79 \item Non vi è una libreria generica in Octave (msh, fpl, bim, ..)
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80 \item Lasciare all'utente la scelta di utilizzare il linguaggio che preferisce
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81 \item Sfruttare le potenzialità di Octave per la risoluzione di sistemi lineari
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82 e sistemi di o.d.e
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83 \item Migliorare i punti deboli dell'interfaccia Python
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84 \end{itemize}
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85
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86 \end{frame}
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87
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88 \begin{frame}
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89 \frametitle{Installazione, Documentazione, Wiki, ...}
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90 \only<1>{
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91 \texttt{pkg install fem-fenics -forge}
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92 \begin{center}
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93 \includegraphics[width=.9\linewidth]{inst.png}
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94 \end{center}
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95 }
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98 \only<2>{
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99 \url{http://wiki.octave.org/Fem-fenics}
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100 \begin{center}
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101 \includegraphics[width=.9\linewidth]{wiki.png}
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102 \end{center}
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103 }
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105
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106 \only<3>{
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107 \url{http://octave.sourceforge.net/fem-fenics/overview.html}
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108 \begin{center}
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109 \includegraphics[width=.9\linewidth]{func.png}
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110 \end{center}
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111 }
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112 \end{frame}
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113
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114 \subsection{Esempi}
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115
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116 \begin{frame}[fragile]{Poisson}
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117 \scriptsize
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118 \only<1>{
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119 \includegraphics[width=1.\linewidth]{pois.png}}
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121 \only<2>{
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122 \includegraphics[width=1.\linewidth]{pois2.png}}
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124 \end{frame}
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126 \begin{frame}[fragile]{Navier Stokes}
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127 \scriptsize
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128 \includegraphics[width=1.\linewidth]{ns.png}
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129 \end{frame}
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130
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131 \begin{frame}[fragile]{Mixed Poisson}
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132 \scriptsize
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133 \includegraphics[width=1.\linewidth]{mixed.png}
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135 \end{frame}
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137 \begin{frame}[fragile]{Elasticity}
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138 \scriptsize
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139 \includegraphics[width=1.\linewidth]{hyper.png}
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140 \end{frame}
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141
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142 \section{Implementazione}
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143
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144 \begin{frame}[fragile]{Octave e C++}
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145 \begin{itemize}
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146 \item Octave è principalmente scritto in C++ (script, Fortran)
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147 \item Octave offre un'interfaccia per includere codice C++ come ``dinamically linked extension''
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148 \item Una volta compilato (\texttt{mkoctfile}) il codice può essere chiamato dall' ``interpreter'' come
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149 ogni altra funzione
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150 \item Octave offre la possibilità di aggiungere nuove classi all'``interpreter''
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151 \end{itemize}
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152 \end{frame}
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153
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154 \begin{frame}[fragile]{Il problema}
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155 \includegraphics[width=1.\linewidth]{octfem.png}
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156 \end{frame}
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157
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158 \begin{frame}[fragile]{Class design}
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159 \only<1>{\lstinputlisting[language=C++,linerange=1-23,firstnumber=1]{./esempi/classe.cc}}
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160 \only<2>{\lstinputlisting[language=C++,linerange=41-54,firstnumber=last]{./esempi/classe.cc}}
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161 \only<3>{\lstinputlisting[language=C++,linerange=29-38,firstnumber=last]{./esempi/classe.cc}}
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162 %\only<4>{\lstinputlisting[language=C++,linerange=57-72,firstnumber=last]{./esempi/classe.cc}}
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163 \pause
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164 %\attachfile[icon=Paperclip]{./esempi/classe.cc}{source code of the example}
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165 \end{frame}
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166
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167 \begin{frame}[fragile]{Funzioni dinamiche in Octave}
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168 \only<1>{\lstinputlisting[language=C++,linerange=1-17,firstnumber=1]{./esempi/func.cc}}
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169 \only<2>{\lstinputlisting[language=C++,linerange=18-29,firstnumber=last]{./esempi/func.cc}}
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170 \pause
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171 %\attachfile[icon=Paperclip]{./esempi/func.cc}{source code of the example}
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172 \end{frame}
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173
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174 \begin{frame}[fragile]{Perchè abbiamo due file ?}
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175 Come funziona Fenics in C++
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176 \begin{itemize}
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177 \item Problema risolto in due file: \texttt{Poisson.ufl} e \texttt{Poisson.cc}
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178 \item Problema astratto definito dall'utente nel file \texttt{Poisson.ufl} .
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179 \item Il file viene compilato dall'utente e viene generato l'header \texttt{Poisson.h}
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180 \item \texttt{Poisson.h} contiene la definizione della classe Poisson e dei costruttori delle forme
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181 (bi)lineari e dello spazio funzionale
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182 \item L'header viene incluso nel file \texttt{Poisson.cc} e il problema risolto
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183 \begin{lstlisting}
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184 #include "Poisson.h"
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185 int main()
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186 {
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187 UnitSquareMesh mesh(32, 32);
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188 Poisson::FunctionSpace V(mesh);
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189 Poisson::BilinearForm a(V, V);
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190 Poisson::LinearForm L(V);
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191 ...
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192 \end{lstlisting}
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193
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194 \end{itemize}
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195 \end{frame}
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196
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197 \begin{frame}[fragile]{Code on the fly}
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198 \lstinputlisting[language=C++,linerange=1-22,firstnumber=1]{./esempi/import_ufl_FunctionSpace.m}
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199 %\only<2>{\lstinputlisting[language=C++,linerange=1-32,firstnumber=1]{./esempi/generate_fs.m}}
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200 %\pause
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201 %\attachfile[icon=Paperclip]{./esempi/func.cc}{source code of the example}
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202 \end{frame}
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203
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204
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205 \begin{frame}[fragile]{Code on the fly}
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206 \lstinputlisting[language=C++,linerange=1-22,firstnumber=1]{./esempi/generate_fs.m}
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207 %\attachfile[icon=Paperclip]{./esempi/func.cc}{source code of the example}
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208 \end{frame}
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209
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210 \begin{frame}[fragile]{Implementzione}
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211 Altri aspetti implementativi descritti nella documentazione
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212 \begin{itemize}
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213 \item Conversione da (p, e, t) a dolfin xml
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214 \item Estensione del pkg msh con la funzione \texttt{mshm\_refine ()}
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215 \item Conversione da csc a csr
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216 \item Polimorfismo (save, plot)
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217 \item Autoconf, Automake e la generazione del pkg
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218 \end{itemize}
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219 \end{frame}
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220
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221 \begin{frame}[fragile]{Conclusione}
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222 La prima versione del pkg è stata rilasciata, ma ancora del
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223 lavoro resta da fare
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224 \begin{itemize}
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225 \item TODO sulla wiki
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226 \item Aggiungere funzioni disponibili in Fenics
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227 \item Estendere con nuovi esempi
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228 \item Migliorare la gestione delle matrici
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229 \item Controllare che tutto funzioni anche con le nuove versioni di Octave e Fenics
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230 \item ...
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231 \end{itemize}
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232 \end{frame}
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233 \end{document}