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I'd like to achieve that, using pgfplots, an axis is half as high as it is wide (or, in a slightly different scenario, half as high as it "should" be).

Consider this MWE

\documentclass[11pt,a4paper]{article} \usepackage{tikz} \usepackage{pgfplots} \pgfplotsset{compat=newest} \begin{document} \begin{figure} \centering \pgfplotsset{ width = 7cm } \begin{tikzpicture} \matrix{ \begin{axis} [ height = \pgfkeysvalueof{/pgfplots/width}*0.5, xticklabel = \empty ] \addplot coordinates {(1,1) (2,2)}; \end{axis} \\ \begin{axis} \addplot coordinates {(1,2) (2,1)}; \end{axis} \\ }; \end{tikzpicture} \end{figure} \end{document}

This works, as long as width is explicitly set outside. How can I make this work, agnostic of whether width is set or not, falling back to \axisdefaultwidth if necessary.

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  • The key value for width is not the actual width, which probably hasn't even been set when the key value for height is processed. Commented Feb 15 at 14:32

2 Answers 2

Reset to default
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By default \axisdefaultwidth is 240pt and \axisdefaultheight 207pt. When you set only axis width or height, pgfplots will keeps the aspect ratio between \axisdefaultwidth and \axisdefaultheight.

EDIT

There is the key y post scale, but as pointed by @hpekristiansen in a comment this only scales the figure vertically, so y post scale=0.5 doesn't give exactly what you want.

Instead you can set the aspect ratio with

\def\axisdefaultheight{\dimeval{\axisdefaultwidth*0.5}}}

Define a key to handle that

\pgfplotsset{ axis ratio/.code={\def\axisdefaultheight{\dimeval{\axisdefaultwidth*#1}}} }

and use

\begin{axis}[ axis ratio={1/2} ]

Example:

\documentclass[11pt,a4paper]{article} \usepackage{pgfplots} \pgfplotsset{compat=newest} \pgfplotsset{ axis ratio/.code={\def\axisdefaultheight{\dimeval{\axisdefaultwidth*#1}}} } \begin{document} \begin{tikzpicture} \begin{axis} [ width=240pt, height = 120pt, ] \addplot coordinates {(1,1) (2,2)}; \end{axis} \end{tikzpicture} \begin{tikzpicture} \begin{axis}[ axis ratio={1/2} ] \addplot coordinates {(1,2) (2,1)}; \end{axis} \end{tikzpicture} \end{document}

Example

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    That does not work. y post scale=0.5 sets the height to half of what it else would have been. -not dependent of the width at all. You can see that your two graphs does not have the same height. Commented Feb 16 at 11:05
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    @hpekristiansen I didn't see that, thanks. I found a fix. I edited the answer. Commented Feb 16 at 21:00
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\documentclass[tikz, border=1cm]{standalone} \usepackage{pgfplots} \pgfplotsset{compat=1.18} \begin{document} \begin{tikzpicture} \matrix{ \begin{axis}[ width=\axisdefaultwidth, height=0.5*\axisdefaultwidth, scale only axis=true, xticklabel=\empty, ] \addplot coordinates {(1,1) (2,2)}; \end{axis}\\ \begin{axis}[scale only axis=true] \addplot coordinates {(1,2) (2,1)}; \end{axis}\\ }; \end{tikzpicture} \end{document}

Two graphs with different scaling

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  • scale only axis=true is not needed - I am only guessing that is what you really want. Commented Feb 15 at 15:37

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