将单位添加为单刻度标签

Question

我想使用倒数第二个刻度标签作为我的单位的位置，如下所示。有办法替换它吗？

梅威瑟：

\documentclass{article}
\usepackage{pgfplots}
\begin{document}
   \begin{tikzpicture}
      \begin{axis}[xlabel={$x$}, ylabel={$y$}]
      \end{axis}
   \end{tikzpicture}
\end{document}

编辑：我尝试将它应用到我的具有以下 x 和 y 范围的数据中，但尺寸似乎太大了？

\begin{tikzpicture}
  \begin{axis}[
    scaled x ticks = false,
    xmin=0,
    xmax=20000,
    ymin=0,
    ymax=3000,
    ytick={0,500,...,3000},
    xticklabel={\ifdim\tick pt=18000pt Hz \else \axisdefaultticklabel\fi},
    yticklabel={\ifdim\tick pt=2500pt - \else \axisdefaultticklabel\fi},
  ]
  \addplot coordinates {(19000,2000)};
  \end{axis}
\end{tikzpicture}

EDIT2：使用任一命令都会搞乱半符号刻度。

\documentclass[tikz, border=1cm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
   \begin{semilogyaxis}[
     xmin=0,
     xmax=2000,
     log ticks with fixed point,
     ymin=0.0001,
     ymax=0.1,
     xticklabel={\pgfmathparse{int(\tick)} \ifnum \pgfmathresult=1500 test \else \axisdefaultticklabel\fi},
     % yticklabel={\ifdim\tick pt=0.01pt \unit{\newton} \else \axisdefaultticklabel\fi},
     yticklabel={\pgfmathparse{int(\tick)} \ifnum \pgfmathresult=0.01 test \else \axisdefaultticklabel\fi},
   ]
   \end{semilogyaxis}
 \end{tikzpicture}

\结束{文档}

Answer 1

\documentclass[tikz, border=1cm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xlabel={$x$}, ylabel={$y$},
xmin=0, xmax=4,
ymin=-0.45, ymax=0.05,
xtick distance=0.5, ytick distance=0.05,
x tick label style={/pgf/number format/.cd, fixed, fixed zerofill, precision=1},
y tick label style={/pgf/number format/.cd, fixed, fixed zerofill, precision=2},
xticklabel={\ifdim\tick pt=3.5pt mm \else \axisdefaultticklabel\fi},
yticklabel={\ifdim\tick pt=0.0pt mm \else \axisdefaultticklabel\fi},
]
\end{axis}
\end{tikzpicture}
\end{document}

编辑：适用于更高数字的版本

\documentclass[tikz, border=1cm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
width=\textwidth, height=0.5\textwidth,
scaled x ticks=false,
xmin=0, xmax=20000,
ymin=0, ymax=3000,
xtick distance=2000, ytick distance=500,
xticklabel={\pgfmathparse{int(\tick)} \ifnum \pgfmathresult=18000 Hz \else \axisdefaultticklabel\fi},
yticklabel={\pgfmathparse{int(\tick)} \ifnum \pgfmathresult=2500 Hz \else \axisdefaultticklabel\fi},
]
\end{axis}
\end{tikzpicture}
\end{document}

Answer 2

作为骨架，函数的绘制留给你：

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
   \begin{tikzpicture}
\begin{axis}[
    grid,
    xlabel = {$x$}, 
    ylabel = {$y$},
    xmin=0, xmax=4,
    xtick = {0,0.5,...,4},
    xticklabels = {0,0.5,1,1.5,2,2.5,3,mm,4},
    ymin=-0.45, ymax=0,
    ytick = {-0.45,-0.40,..., 0.0},
    yticklabels = {-0.45,-0.40,-0.35,-0.25,-0.20,-0.15,-0.10,-0.05, mm, 0.0},
            ]
%\addplot [domain=0:4] {1};
\end{axis}
   \end{tikzpicture}
\end{document}