8

My code:

\documentclass[]{article}
\usepackage[english]{babel}
\usepackage{tikz}
\usetikzlibrary{graphs}
\begin{document}
    \pagenumbering{gobble}
    \begin{tikzpicture}
        \graph [nodes={draw, circle}, clockwise, radius=.75cm, empty nodes, n=8] {
            subgraph C_n [name=inner] <->[shorten <=1pt, shorten >=1pt]
            subgraph C_n [name=outer]
        };
    \end{tikzpicture}
\end{document}

produces the following figure:

enter image description here

instead of the intended figure:

enter image description here

Why could this be?

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4
  • 3
    Right, that's peculiar, as your code is a straight copy from ch. 19 in the pgfmanual. I tried the subgraph example above it, which doesn't work either, while the simple abcd graph does work. I.e. once subgraph is involved, it's "mad".
    – MS-SPO
    Commented Oct 6, 2022 at 11:12
  • 1
    You should load \usetikzlibrary{graphs.standard}. In don't know why this is not stated in the manual.
    – Jasper Habicht
    Commented Oct 6, 2022 at 12:27
  • 1
    @JasperHabicht good catch. There is a cryptic warning if you don't add that library... Package pgf Warning: Returning node center instead of a point on node border. Did you specify a point identical to the center of node ``subgraph C_n''? on input line 12.
    – Rmano
    Commented Oct 6, 2022 at 12:30
  • 1
    I just opened a git issue.
    – Jasper Habicht
    Commented Oct 6, 2022 at 12:36

1 Answer 1

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9

There seems to be a mistake in the manual, since the libraray graphs.standard is needed for this to work:

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{graphs.standard}

\begin{document}
    \begin{tikzpicture}
        \graph [nodes={draw, circle}, clockwise, radius=.75cm, empty nodes, n=8] {
            subgraph C_n [name=inner] <->[shorten <=1pt, shorten >=1pt]
            subgraph C_n [name=outer]
        };
    \end{tikzpicture}
\end{document}

enter image description here

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1
  • It seems that this is not the only case where the libraries stated in the example are not sufficient. The issue is known and currently being addressed by the package maintainers.
    – Jasper Habicht
    Commented Oct 13, 2022 at 8:19

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