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sum.tex
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sum.tex
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\documentclass{standalone}
\usepackage{tikz,rxmarbles}
\usetikzlibrary[arrows,shapes,positioning,matrix]
\begin{document}
\begin{tikzpicture}
\matrix[row sep=0.5cm]
{
\draw [time] (0,0) -- (7,0);
\node[marble,circle,inner sep=0pt] (0x0) at (1,0) {\scriptsize{$x_1$}};
\node[marble,circle,inner sep=0pt] (1x0) at (2,0) {\scriptsize{$x_2$}};
\node[marble,circle,inner sep=0pt] (2x0) at (3,0) {\scriptsize{$x_3$}};
\node[marble,circle,inner sep=0pt] (3x0) at (4,0) {\scriptsize{$x_4$}};
\node[draw=none,inner sep=0pt] (4x0) at (4.7,0.1) {\scriptsize{\boldmath$\ldots$}};
\node[marble,circle,inner sep=0pt] (5x0) at (5.4,0) {\scriptsize{$x_n$}};
\node[complete] (6x0) at (5.8,0) {};
\\
\node[box,minimum width=7cm] (op) {Sum};
\\
\draw [time] (0,0) -- (7,0);
\node[marble,circle,inner sep=1pt] (5x2) at (5.8,0) {\scriptsize{$\sum\limits_{i=1}^{n} x_i$}};
\node[complete] (6x2) at (6.5,0) {};
\\
};
\draw [fdash] (0x0) -- (0x0|-op.north);
\draw [fdash] (1x0) -- (1x0|-op.north);
\draw [fdash] (2x0) -- (2x0|-op.north);
\draw [fdash] (3x0) -- (3x0|-op.north);
\draw [fdash] (5x0) -- (5x0|-op.north);
\draw [fdash] (6x0) -- (6x0|-op.north);
\draw [rdash] (5x2) -- (5x2|-op.south);
\draw [rdash] (6x2) -- (6x2|-op.south);
\end{tikzpicture}
\end{document}