LaTeX-examples/tikz/center-two-cluster/center-two-cluster.tex

\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}
\usepackage{tikz}
\usepackage{tkz-fct}
\usetikzlibrary{shapes.misc}
\usetikzlibrary{shapes, calc, shapes, decorations}
\usepackage{amsmath,amssymb}

\begin{document}
\begin{preview}
\begin{tikzpicture}[scale=0.1,dot/.style={    thick,
    draw=gray,
    cross out,
    inner sep=0pt,
    minimum width=4pt,
    minimum height=4pt}]

\draw[->] (-3.43,8.41) -- (-0.69,1.68);
\draw[->] (-5.48,3.65) -- (-1.10,0.73);
\draw[->] (2.52,-7.45) -- (0.50,-1.49);
\draw[->] (2.97,-3.76) -- (0.59,-0.75);
\draw[->] (3.43,-0.85) -- (0.69,-0.17);
\draw[->] (15.00,0.00) -- (3.00,0.00);
\node[circle,inner sep=1pt,fill]  at (0.00,0.00) {};
\foreach \point in {(15.00,0.00),(3.43,-0.85),(2.97,-3.76),(2.52,-7.45),(-5.48,3.65),(-3.43,8.41)}{
\node[dot] at \point {};
}
\draw[->] (39.63,0.85) -- (39.93,0.17);
\draw[->] (43.27,-8.94) -- (40.65,-1.79);
\draw[->] (38.54,9.68) -- (39.71,1.94);
\draw[->] (34.19,-5.01) -- (38.84,-1.00);
\draw[->] (44.37,3.43) -- (40.87,0.69);
\draw[->] (25.00,0.00) -- (37.00,0.00);
\node[circle,inner sep=1pt,fill]  at (40.00,0.00) {};
\foreach \point in {(25.00,0.00),(44.37,3.43),(34.19,-5.01),(38.54,9.68),(43.27,-8.94),(39.63,0.85)}{
\node[dot] at \point {};
}
\node[circle,inner sep=1pt,fill]  at (40.00,0.00) {};
\foreach \point in {(15,0), (35,0)}{
\node[dot] at \point {};
}

\end{tikzpicture}
\end{preview}
\end{document}