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I'm trying to draw a derivation tree for a simple grammar using tikz-qtree.

Here is my current code:

\documentclass[11pt]{article} \usepackage{tikz} \usetikzlibrary{shapes,arrows,calc} \usepackage{tikz-qtree} % ---------- \begin{document} \begin{tikzpicture} \tikzset{grow'=right} \tikzset{every tree node/.style={anchor=base west}} \Tree [.$SS$ [.$(S)$ $()$] [.$(S)$ [.$((S))$ $(())$] ] ] \end{tikzpicture} \end{document}

My intended result looks like this:

 -(S)------------() -/ -/ -/ -/ -/ SS -\ -\ -\ -\ -\ -\ -(S)---------((S))----------(())

When I compile the document, I get a bunch of missing end brace complaints "./main.tex:21: Missing } inserted", but the square brackets in the \Tree are balanced as far as I can see.

What am I doing wrong?

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2 Answers 2

Reset to default
7

Here are three different ways to draw the graph

tikz-qtree solution

Take care of the white space!

\documentclass[11pt]{article} \usepackage{tikz} \usetikzlibrary{shapes,arrows,calc} \usepackage{tikz-qtree} % ---------- \begin{document} \begin{tikzpicture} \tikzset{grow'=right} \tikzset{every tree node/.style={anchor=base west}} \Tree [.$SS$ [.$(S)$ $()$ ] [.$(S)$ [.$((S))$ $(())$ ] ] ] \end{tikzpicture} \end{document}

enter image description here

Pure TikZ solution

\documentclass[tikz]{standalone} \usetikzlibrary{positioning} \begin{document} \begin{tikzpicture}[node distance=0.5cm] \node (ss) {$SS$}; \node[above right=of ss] (sa) {$(S)$}; \node[right=of sa] (br1) {$()$}; \node[below right=of ss] (sb) {$(S)$}; \node[right=of sb] (ssb) {$((S))$}; \node[right=of ssb] (br2) {$(())$}; \draw (br1) -- (sa) -- (ss) -- (sb) -- (ssb) -- (br2); \end{tikzpicture} \end{document}

enter image description here

tikzcd solution

\documentclass{standalone} \usepackage{tikz-cd} \begin{document} \begin{tikzcd}[every arrow/.append style={dash}] & (S) \arrow[r] & ()\\ SS \arrow[ru]\arrow[rd] & &\\ & (S) \arrow[r] & ((S)) \arrow[r] & (()) \end{tikzcd} \end{document}

enter image description here

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  • 1
    Can you point out the difference? What did I mess up? Commented Apr 13, 2019 at 17:33
  • 1
    @AdamWilliams There are difference: my [.$(S)$ $()$ ] is working but your [.$(S)$ $()$] is not working (take note of the white space) Commented Apr 13, 2019 at 17:34
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    @AdamWilliams You are welcome! Although you were so close, but only one white space is a great deal for this package :) Unfortunately, the error message is not really clear. Commented Apr 13, 2019 at 17:49
7

I'd like to persuade you to switch to forest.

\documentclass{article} \usepackage[edges]{forest} \begin{document} \begin{forest} for tree={grow=east} [$SS$ [$(S)$ $()$] [$(S)$ [$((S))$ $(())$] ] ] \end{forest} \end{document}

enter image description here

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1
  • A tempting proposition - I do prefer forest's syntax! Commented Apr 13, 2019 at 17:31

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