pgfplots：仅整数，并且仅在 x 轴上的整数位置处刻度

Question

我想创建xbar这样的图表，但我想设置

• 仅限整数在底部 x 轴（没有 0.5、1.5、2.5、...） 和
• 只在整数位置打勾（0.5、1.5、2.5 ... 处无刻度）

还有另外一个问题： xmax从 1 到 '~400'（具有相同的图表宽度），因此明确设置 x 不是一个好主意，例如xtick={1,2,...,\n}（此处 \def\n{400}）。
自动、自适应的 x 轴标记pgfplots是可以的，但是只能出现整数。

---

我试过这里

% https://tex.stackexchange.com/a/286623/46023
xticklabel={%
        \pgfmathtruncatemacro{\IntegerTick}{\tick}%
        \pgfmathprintnumberto[verbatim,fixed,precision=3]{\tick}\tickAdjusted%
        \pgfmathparse{\IntegerTick == \tickAdjusted ? 1: 0}%
        \ifnum\pgfmathresult>0\relax$\IntegerTick$\else\fi%
},  

但是这种方法仍然会设置刻度（0.5、1.5、2.5等等）...

---

我需要做什么？

\documentclass[margin=5pt, tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
\foreach \n in {1,...,6,155,400}{%%%%%%%%%%%%%%%%%

\pgfmathtruncatemacro\A{random(0,\n)}
\pgfmathtruncatemacro\B{random(0,\n-1)}
\pgfmathtruncatemacro\R{abs(\n-\A-\B)}

\begin{tikzpicture}[]
\begin{axis}[
width=11cm,% needed 
height=5cm, 
xbar,
bar shift=0pt,
bar width=5mm,
y tick label as interval,
nodes near coords, 
axis x line*=none, % hide upper x-axis
%
ymin=0.5, ymax=4.5,
xmin=0, xmax=\n,
extra x ticks={\n}, % for savety, sometimes he will not set the last....
ytick={1,...,4},
yticklabels={Rest, B, A}, 
title={Diagram No. \n},
title style={anchor=south, yshift=3mm,},
%%% https://tex.stackexchange.com/a/286623/46023
%xticklabel={%
%        \pgfmathtruncatemacro{\IntegerTick}{\tick}%
%        \pgfmathprintnumberto[verbatim,fixed,precision=3]{\tick}\tickAdjusted%
%        \pgfmathparse{\IntegerTick == \tickAdjusted ? 1: 0}%
%        \ifnum\pgfmathresult>0\relax$\IntegerTick$\else\fi%
%},  
]
\addplot[fill=blue] coordinates { (\A, 3.5) };
\addplot[fill=brown] coordinates { (\B, 2.5) };
\addplot[fill=gray] coordinates { (\R, 1.5) };
\end{axis}

% 2nd percentual axis ==========================
\begin{axis}[
width=11cm, 
height=5cm, 
axis x line=top, 
hide y axis, 
x axis line style={-},
xticklabel={\pgfmathparse{100*\tick}\pgfmathprintnumber[precision=0]{\pgfmathresult}\%},
minor tick num=1,
]
\end{axis}
% ======================================
\end{tikzpicture}
}%% end foreach %%%%%%%%%%%%%%%%%%%%%
\end{document}

Answer 1

也许像这样？

• 您xtick明确设置仅在指定范围内的整数处进行刻度。
• 由于您明确定义了 xtick 位置，因此请删除条件 xticklabel 代码。

\documentclass[margin=5pt, tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
\foreach \n in {1,...,6}{%%%%%%%%%%%%%%%%%

\pgfmathtruncatemacro\A{random(0,\n)}
\pgfmathtruncatemacro\B{random(0,\n-1)}
\pgfmathtruncatemacro\R{abs(\n-\A-\B)}

\begin{tikzpicture}[]
\begin{axis}[
width=11cm,% needed 
height=5cm, 
xbar,
bar shift=0pt,
bar width=5mm,
y tick label as interval,
nodes near coords, 
axis x line*=none, % hide upper x-axis
%
ymin=0.5, ymax=4.5,
xmin=0, xmax=\n,
xtick={0,...,\n}, % Set ticks only at integer positions
ytick={1,...,4},
yticklabels={Rest, B, A}, 
title={Diagram No. \n},
title style={anchor=south, yshift=3mm,},
]
\addplot[fill=blue] coordinates { (\A, 3.5) };
\addplot[fill=brown] coordinates { (\B, 2.5) };
\addplot[fill=gray] coordinates { (\R, 1.5) };
\end{axis}

% 2nd percentual axis ==========================
\begin{axis}[
width=11cm, 
height=5cm, 
axis x line=top, 
hide y axis, 
x axis line style={-},
xticklabel={\pgfmathparse{100*\tick}\pgfmathprintnumber[precision=0]{\pgfmathresult}\%},
minor tick num=1,
]
\end{axis}
% ======================================
\end{tikzpicture}
}%% end foreach %%%%%%%%%%%%%%%%%%%%%
\end{document}

编辑 1 以考虑xmax =400

\documentclass[margin=5pt, tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
\foreach \n in {1,...,6}{%%%%%%%%%%%%%%%%%

\pgfmathtruncatemacro\A{random(0,\n)}
\pgfmathtruncatemacro\B{random(0,\n-1)}
\pgfmathtruncatemacro\R{abs(\n-\A-\B)}

\begin{tikzpicture}[]
\begin{axis}[
width=11cm,% needed 
height=5cm, 
xbar,
bar shift=0pt,
bar width=5mm,
y tick label as interval,
nodes near coords, 
axis x line*=none, % hide upper x-axis
%
ymin=0.5, ymax=4.5,
xmin=0, xmax=400, % <= Adjusted here
xtick distance=40, % Set ticks at every 40 units
ytick={1,...,4},
yticklabels={Rest, B, A}, 
title={Diagram No. \n},
title style={anchor=south, yshift=3mm,},
]
\addplot[fill=blue] coordinates { (\A, 3.5) };
\addplot[fill=brown] coordinates { (\B, 2.5) };
\addplot[fill=gray] coordinates { (\R, 1.5) };
\end{axis}

% 2nd percentual axis ==========================
\begin{axis}[
width=11cm, 
height=5cm, 
axis x line=top, 
hide y axis, 
x axis line style={-},
xticklabel={\pgfmathparse{100*\tick}\pgfmathprintnumber[precision=0]{\pgfmathresult}\%},
minor tick num=1,
]
\end{axis}
% ======================================
\end{tikzpicture}
}%% end foreach %%%%%%%%%%%%%%%%%%%%%
\end{document}