在 pgfplot 上的 x 轴数据中显示最后一个数字

Question

我怎样才能让 x 轴上的最后一个数字（在本例中为 40^7）也显示在图上？

这是我的代码：

\documentclass[11pt]{book}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{float}
\usepackage{pgfplots,pgfplotstable, booktabs}
\pgfplotsset{compat=1.8}

\begin{filecontents*}{nano.csv}
100 -79.374
101.801 -79.858
103.634 -78.587
105.501 -79.077
107.401 -78.735
109.335 -81.799
111.304 -82.298
34884753.53 -150.333
38828202.58 -152.993
39527488.85 -154.021
40000000    -153.788
\end{filecontents*}

\pgfplotsset{minor grid style={dashed,red}}
\pgfplotsset{major grid style={dotted,green!50!black}}

\begin{document}
\begin{figure}[H]
\begin{center}

\begin{tikzpicture}
\begin{semilogxaxis}[xmin = 100, xmax = 40e6, scale = .75, width=20cm,height=10cm, title = {\emph{(a) $P_{T}$ over different samples}},
x tick label style={
        /pgf/number format/fixed,
        /tikz/.cd
    }, xlabel={\emph{Offset Frequency (Hz)}},ylabel={\emph{Phase Noise (dBc/Hz)}}]

\addplot [blue]table[x index=0,y index=1,col sep=space] {nano.csv};

\end{semilogxaxis}
\end{tikzpicture}

\caption[Plot showing (a) position ${\mathbf{P_{T}}}$.]{Plot showing position ${\mathbf{P_{T}}}$.}\label{noise}
\end{center}
\end{figure}

\end{document} 

Answer 1

你的意思是：

为此，我添加了axis选项extra x ticks = {4e7}。

附录：根据您的评论：您需要放大xmax到4'e75E7 或更好。

笔记：x表中的最大值是 或40e6， 因此将其放大 10 倍4e7是没有意义的（即： ）。xmax40e7

\documentclass[11pt]{book}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage{float}
\usepackage{pgfplots,pgfplotstable, booktabs}
\pgfplotsset{compat=1.8}

\begin{filecontents*}{nano.csv}
100 -79.374
101.801 -79.858
103.634 -78.587
105.501 -79.077
107.401 -78.735
109.335 -81.799
111.304 -82.298
34884753.53 -150.333
38828202.58 -152.993
39527488.85 -154.021
40000000    -153.788
\end{filecontents*}

\pgfplotsset{minor grid style={dashed,red}}
\pgfplotsset{major grid style={dotted,green!50!black}}

    \begin{document}
\begin{figure}[htb]
    \centering
\begin{tikzpicture}
    \begin{semilogxaxis}[
            width = 15cm, height=7.5cm,
             xmin = 100, xmax = 50e6,
            title = {\emph{(a) $P_{T}$ over different samples}},
x tick label style={/pgf/number format/fixed,
                    /tikz/.cd}, 
            xlabel={\emph{Offset Frequency (Hz)}},
            ylabel={\emph{Phase Noise (dBc/Hz)}},
    extra x ticks = {40e6}
                    ]
\addplot [blue]table[x index=0,y index=1,col sep=space] {nano.csv};
    \end{semilogxaxis}
\end{tikzpicture}
    \caption{Plot showing position ${\mathbf{P_{T}}}$.}
\label{noise}
\end{figure}
    \end{document}