4

I know my question is trivial. By the way, I can not show points given by their coordinates with a Bezier curve using Tikz.

    \documentclass{article}

    \usepackage{tikz}

    \begin{document}
    \begin{tikzpicture}
    \draw [<->,thick] (0,2) node (yaxis) [above] {$y$}
            |- (3,0) node (xaxis) [right] {$x$};
    %\draw [gray!50]  (0,0) -- (1,1) -- (3,1) -- (1,0)  -- (2,-1) -- cycle;
    \draw [red] plot [smooth] coordinates {(0,0) (1,1) (1.5, 1.5) (2,1.5) (2.5,2) (3,1) (1,0) (2,-1)};

    %\draw [gray!50, xshift=4cm]  (0,0) -- (1,1) -- (2,-2) -- (3,0);
    %\draw [cyan, xshift=4cm] plot [smooth, tension=2] coordinates { (0,0) (1,1) (2,-2) (3,0)};
    \end{tikzpicture}
\end{document}

which gives

enter image description here

I would like to give a draw like this

enter image description here

Many thanks for any help.

3
  • And, yes, you can definitely use tikz in beamer. :)
    – hpesoj626
    Feb 22, 2013 at 14:58
  • Just add mark=* after the smooth option. Is that what you mean?
    – Jake
    Feb 22, 2013 at 15:14
  • @cmhughes: Done
    – Jake
    Feb 22, 2013 at 16:38

1 Answer 1

2

You can show plot the individual points by adding mark=* to the plot options, which will use a filled circle marker. There are many marker types, and they can be styled independently of the plot line (e.g. their size, colour, line thickness, etc.). Refer to the manual for more details.

\documentclass{article}

\usepackage{tikz}

\begin{document}
    \begin{tikzpicture}
    \draw [<->,thick] (0,2) node (yaxis) [above] {$y$}
            |- (3,0) node (xaxis) [right] {$x$};
    \draw [red] plot [smooth, mark=*] coordinates {(0,0) (1,1) (1.5, 1.5) (2,1.5) (2.5,2) (3,1) (1,0) (2,-1)};
    \end{tikzpicture}
\end{document}
1
  • @Averroès: Thanks for accepting! In the process, you also downvoted the answer by clicking the downward pointing triangle. I assume that was by accident? In that case, would you mind undoing the downvote?
    – Jake
    Feb 23, 2013 at 16:42

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