由于数据的性质，我试图在 pgfplots 中创建我的数据的箱线图，并使用 Y 轴的平方根缩放。
这是我的代码：
\documentclass{article}
\usepackage{pgfplots}
\usetikzlibrary{pgfplots.statistics}
\pgfplotsset{compat=1.17}
\usepackage{filecontents}
\begin{filecontents*}{file.csv}
a,b,c,d,e
0.0,2.842170943040401e-14,0.0,0.02581787109375,1.8994026184082031
0.0,0.3329588710026492,0.75,0.02837371826171875,0.4414405822753906
0.0,0.15510184685969364,0.375,0.1663665771484375,0.199951171875
0.0,0.000375662574413127,0.0,0.2701606750488281,0.8085689544677734
0.0,1.4210854715202004e-14,0.0,0.03917694091796875,0.25116539001464844
\end{filecontents*}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
boxplot/draw direction=y,
ymin=0., ymax=64.,
y coord trafo/.code={\pgfmathparse{sqrt{#1}}}, % Y-axis forward transform
y coord inv trafo/.code={\pgfmathparse{#1^2}}, % Y-axis backward transform
table/row sep=newline,
table/col sep=comma
]
\addplot+[boxplot={draw position=1}, fill, draw=black, solid, mark=none] table [y=a] {file.csv};
\end{axis}
\end{tikzpicture}
\end{document}
我收到了一条模棱两可的错误消息
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2021) (preloaded format=pdflatex)
restricted \write18 enabled.
entering extended mode
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LaTeX2e <2020-10-01> patch level 4
L3 programming layer <2021-02-18>
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./sqrt_plot.tex:26: Missing \endcsname inserted.
<to be read again>
\relax
l.26 ... solid, mark=none] table [y=b] {file.csv};
?
这似乎是坐标缩放的问题。但是，当我用\addplot以下内容替换时，它就可以正常工作。
\addplot { x^2 }; % this works
该问题一定与坐标变换与 CSV 绘图数据结合时有关。
有人能帮帮我吗？
答案1
在某些时候，它与非数字一起boxplot使用。-否则它似乎有效。我从这里复制了：y coord trafoisPGFNumberhttps://tex.stackexchange.com/a/463819/8650#1并在转换之前用它来测试是否是一个数字。
按平方根比例绘制的工作箱线图：
\documentclass[tikz, border=1cm]{standalone}
\usepackage{pgfplots}
\usetikzlibrary{pgfplots.statistics}
\newcommand{\isPGFNumber}[3]{% \isPGFNumber{<Number>}{<True>}{<False>}
\begingroup
\pgfkeys{/pgf/fpu/handlers/invalid number/.code={}}%
\pgfmathfloatparsenumber{#1}%
\global\pgfmathfloatgetflagstomacro\pgfmathresult\pgfFloatParseFlag%
\endgroup
\ifnum\pgfFloatParseFlag=3%
#3%
\else%
#2%
\fi%
}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
ymin=0., ymax=64.,
boxplot/draw direction=y,
y coord trafo/.code={\isPGFNumber{#1}{\pgfmathparse{sqrt(#1)}}{}},
y coord inv trafo/.code={\pgfmathparse{#1^2}},
]
\addplot+[boxplot] table[row sep=\\,y index=0] {4\\ 4\\ 4\\ 36\\ 36\\ 36\\};
\addplot {x^2};
\end{axis}
\end{tikzpicture}
\end{document}
