1

I am aware of easily drawing a spiral in the note of nonlinear dynamics. Here are some examples:

enter image description here

enter image description here

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  • 11
    -1: No research effort.
    – Werner
    Mar 13, 2014 at 6:10
  • 3
    Welcome to TeX.SX. Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document.
    – Holene
    Mar 13, 2014 at 6:21
  • 1
    the above is just a statement…not a question!
    – Leeser
    Mar 13, 2014 at 14:09

1 Answer 1

6

You can use TikZ. Here is an example:

enter image description here

But I never used it before, so maybe there is a better method than gluing arrows together, here is the code:

\documentclass{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{width=6cm,compat=newest}

%for arrows in the middle of the line
\usetikzlibrary{decorations.markings}
\tikzset{->-/.style={decoration={
  markings,
  mark=at position #1 with {\arrow{>}}},postaction={decorate}}}

\begin{document}
 \begin{tikzpicture}
  %straight lines
  \draw[->-=.4] (0,0) to (-1,0);
  \draw[->-=.6] (0,-1) to (0,0); 
  %arcs on the left
  \draw[->-=.5] (-0.3,1) to [out=-90,in=0] (-1,0.3);
  \draw[->-=.5] (-0.3,-1) to [out=90,in=0] (-1,-0.3);
  %big circle from the bottom to the top
  \draw[->-=.5] (0.3,-1) to [out=90,in=200] (0.8,-0.3);
  \draw (0.8,-0.3) to [out=20, in =-90] (1.5,0.5) to [out=90, in=0] (0.7,1.3) to [out=180,in=90] (0,0.5);
  \draw[->-=.2]  (0,0.5) to (0,0);
  %inward spiral
  \draw[->-=.8]  (0,0) to (0.5,0);
  \draw[->] (0.5,0) to [out=0, in=-90] (1.1,0.5) to [out=90, in=0] (0.7,0.9) to [out=180, in=90] (0.4,0.6) to [out=-90, in=180] (0.6,0.4) to [out=0,in=-90] (0.75,0.6);
 \end{tikzpicture}
\end{document}

Check you the very minimal introduction to TikZ. In order to get the arrows in the middle of a line, I googled "tikz arrows in the middle of line".

3
  • 1
    Without code it's worth just about nothing. Mar 13, 2014 at 10:34
  • I thought, this more a general question, since the original post had no code in it either. Added the code now.
    – jens_bo
    Mar 13, 2014 at 10:59
  • Wow! Thanks you! It looks really great! I guess I need to spend some time on learning the tikz...
    – LorenMt
    Mar 13, 2014 at 16:15

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