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Latex PGFPLOTS：在刻度之间设置值

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Latex PGFPLOTS：在刻度之间设置值

我正在尝试绘制某城市某一年的平均室外温度。因此，我希望数值（月份）位于 xtick 线之间，而不是线上。有人能帮我吗？

这是我的 Latex 代码，我添加了两张图片，分别是它当前的样子和我希望它看起来的样子。

\documentclass{article}

\usepackage{siunitx}
\usepackage{tikz} % To generate the plot from csv
\usepackage{pgfplots}

\pgfplotsset{compat=newest, every axis/.append style={line width=1.5pt}}
\usepgfplotslibrary{units} % Allows to enter the units nicely
\usepgfplotslibrary{dateplot}

\sisetup{round-mode = places, round-precision = 2,}

\begin{figure}[h!]
      \begin{center}
        \begin{tikzpicture}
          \begin{axis}[
              date coordinates in=x,date ZERO=2017-01-01,xticklabel=\month,
              xmin=2017-01-01,xmax=2018-01-01,
              xtick = {2017-01-01, 2017-02-01, 2017-03-01, 2017-04-01, 2017-05-01, 2017-06-01, 2017-07-01, 2017-08-01, 2017-09-01, 2017-10-01, 2017-11-01, 2017-12-01},
              width= \linewidth, height = 8cm, 
              grid=major,% Display a grid
              grid style={dashed,gray!30},
              xlabel= Month of year, 
              ylabel= Temperature,
              y unit=\si{^\circ C},
              legend style={at={(1,1)},anchor=north east},
              no markers,
            ]
            \addplot table[x=Day,y=T_min, col sep=comma] {tables/Temperatures.csv}; 
            \addlegendentry{\emph{$T_{min}$}} 
          \end{axis}
        \end{tikzpicture}
        \caption{Average Outside Temperature between 2007 - 2017}
      \end{center}
    \end{figure}
\end {document}

目前的情况如下：

在此处输入图片描述

我希望它看起来像这样：

在此处输入图片描述

答案1

一个简单的xshift方法也可以。我还做了一些小的额外更改，并试图解决整个问题。问题是，据我所知，在需要时，刻度之间的（平均）距离是未知的。原则上，如果你们人类每个月的天数没有不同，那么在这种情况下答案会很简单。这就是标签没有完全居中的原因，也是为什么这在二月最为明显。我还添加了一些例程来检索最后两个刻度之间的距离，但在目前的情况下，它只告诉你十二月（或一月）有 31 天，你可能之前就知道了。而且，正如我提到的，这些信息来得太晚了。尽管如此，我还是决定把它留在这里，因为它可能对另一个问题有用。

\documentclass{article}

\usepackage{siunitx}
\usepackage{tikz} % To generate the plot from csv
\usepackage{pgfplots}
\makeatletter
\newcommand{\GetXDistance}[1]{\edef#1{\pgfplots@tick@distance@x}}
\makeatother
\pgfplotsset{compat=newest, every axis/.append style={line width=1.5pt}}
\usepgfplotslibrary{units} % Allows to enter the units nicely
\usepgfplotslibrary{dateplot}

\sisetup{round-mode = places, round-precision = 2,}
\begin{document}
\begin{figure}[h!]
\makeatletter
      \begin{center}
        \begin{tikzpicture}
          \begin{axis}[
              date coordinates in=x,date ZERO=2017-01-01,xticklabel=\month,
              xmin=2017-01-01,xmax=2018-01-01,
              xtick = {2017-01-01, 2017-02-01, 2017-03-01, 2017-04-01, 2017-05-01, 2017-06-01, 2017-07-01, 2017-08-01, 2017-09-01, 2017-10-01, 2017-11-01, 2017-12-01},
              width=\linewidth, height = 8cm,
              grid=major,% Display a grid
              grid style={dashed,gray!30},
              xticklabel style={xshift=15,anchor=north},
              xlabel= Month of year, 
              ylabel= Temperature,
              y unit=\si{\celsius}, % ^\circ and \si ?
              legend style={at={(1,1)},anchor=north east},
              no markers, 
            ]
            \addplot coordinates {(2017-01-01,1) (2017-02-01,2) 
            (2017-03-01,2) (2017-04-01,3) (2017-05-01,3)
            (2017-06-01,4) (2017-07-01,4) (2017-08-01,4)
            (2017-09-01,3) (2017-10-01,3) (2017-11-01,2)
            (2017-12-01,1) (2018-01-01,1)} \pgfextra{\GetXDistance{\mydist}
            \typeout{\mydist}} 
            ;
%            \addplot table[x=Day,y=T_min, col sep=comma] {tables/Temperatures.csv}; 
            \addlegendentry{$T_{min}$} % \emph didn't have any effect here
          \end{axis}
        \end{tikzpicture}
        \caption{Average Outside Temperature between 2007 - 2017}
      \end{center}
      \makeatother
    \end{figure}
\end{document}

在此处输入图片描述

更新：只是为了好玩，利用标签是节点的事实，可以将 xtick 标签居中。

\documentclass{article}

\usepackage{siunitx}
\usepackage{tikz} % To generate the plot from csv
\usepackage{pgfplots}
\newcounter{tickindex}
\makeatletter
\newcommand{\GetXDistance}[1]{\edef#1{\pgfplots@tick@distance@x}}
\makeatother
\pgfplotsset{compat=newest, every axis/.append style={line width=1.5pt}}
\usepgfplotslibrary{units} % Allows to enter the units nicely
\usepgfplotslibrary{dateplot}

\sisetup{round-mode = places, round-precision = 2,}
\begin{document}
\begin{figure}[h!]
\makeatletter
      \begin{center}
        \begin{tikzpicture}
          \begin{axis}[
              date coordinates in=x,date ZERO=2017-01-01,xticklabel=\month,
              xmin=2017-01-01,xmax=2018-01-01,
              xtick = {2017-01-01, 2017-02-01, 2017-03-01, 2017-04-01, 2017-05-01, 2017-06-01, 2017-07-01, 2017-08-01, 2017-09-01, 2017-10-01, 2017-11-01, 2017-12-01,2018-01-01},
              width=\linewidth, height = 8cm,
              grid=major,% Display a grid
              grid style={dashed,gray!30},
              xticklabel style={opacity=0,anchor=north east,name=x-\tick},
              xlabel= Month of year, 
              ylabel= Temperature,
              y unit=\si{\celsius}, % ^\circ and \si ?
              legend style={at={(1,1)},anchor=north east},
              no markers, 
            ]
            \addplot coordinates {(2017-01-01,1) (2017-02-01,2) 
            (2017-03-01,2) (2017-04-01,3) (2017-05-01,3)
            (2017-06-01,4) (2017-07-01,4) (2017-08-01,4)
            (2017-09-01,3) (2017-10-01,3) (2017-11-01,2)
            (2017-12-01,1) (2018-01-01,1)};
%            \addplot table[x=Day,y=T_min, col sep=comma] {tables/Temperatures.csv}; 
            \addlegendentry{$T_{min}$} % \emph didn't have any effect here
          \end{axis}
          \foreach \X [count=\Y] in {2017-01-01,2017-02-01,2017-03-01,2017-04-01,2017-05-01,2017-06-01,2017-07-01,2017-08-01,2017-09-01,2017-10-01,2017-11-01,2017-12-01,2018-01-01}
          {\ifnum\Y=1
          \else
          \pgfmathtruncatemacro{\Month}{\Y-1}
          \path (x-\LastTick)--(x-\X.east) node[midway]{\Month};
          \fi
          \xdef\LastTick{\X}
          }
        \end{tikzpicture}
        \caption{Average Outside Temperature between 2007 - 2017}
      \end{center}
      \makeatother
    \end{figure}
\end{document}

在此处输入图片描述

答案2

由于我没有 .csv 文件，因此我无法重现您的图表，但有一个想法是制作两个重叠的轴。您可以将一个轴设置为ybar interval，这会将您的 x 轴标签放在刻度线之间的间隔中。在另一个轴上，您可以绘制数据但隐藏刻度和标签。

\documentclass{article}

\usepackage{siunitx}
\usepackage{tikz} % To generate the plot from csv
\usepackage{pgfplots}

\pgfplotsset{compat=1.15, every axis/.append style={line width=1.5pt},width= \linewidth, height = 8cm}
\usepgfplotslibrary{units} % Allows to enter the units nicely
\usepgfplotslibrary{dateplot}

\sisetup{round-mode = places, round-precision = 2,}

\begin{document}
\begin{figure}[h!]
      \begin{center}
        \begin{tikzpicture}
        \begin{axis}[ybar interval,
              date coordinates in=x,
              date ZERO=2017-01-01,
              xticklabel=\month,
              xmin=2017-01-01,
              xmax=2018-01-01,
              xtick = {2017-01-01, 2017-02-01, 2017-03-01, 2017-04-01, 2017-05-01, 2017-06-01, 2017-07-01, 2017-08-01, 2017-09-01, 2017-10-01, 2017-11-01, 2017-12-01},
              xlabel= Month of year, 
              ylabel= Temperature,
              y unit=\si{^\circ C},
              grid=major,% Display a grid
              grid style={dashed,gray!30},
        ] 
        \end{axis}
          \begin{axis}[
              xticklabel=\empty,
              legend style={at={(1,1)},anchor=north east},
              no markers,
              axis lines=none,
            ]
%            \addplot table[x=Day,y=T_min, col sep=comma] {tables/Temperatures.csv}; 
            \addlegendentry{\emph{$T_{min}$}} 
          \end{axis}
        \end{tikzpicture}
        \caption{Average Outside Temperature between 2007 - 2017}
      \end{center}
    \end{figure}
\end{document}

在此处输入图片描述

答案3

extra x ticks另一种可能性是每月 15 日使用/添加并xticklabels在那里显示。有关详细信息，请查看代码中的注释。

% used PGFPlots v1.16
\documentclass[border=5pt]{standalone}
\usepackage{siunitx}
    \sisetup{
        round-mode=places,
        round-precision=2,
    }
\usepackage{pgfplots}
    \usepgfplotslibrary{
        dateplot,
        units,
    }
    \pgfplotsset{
        compat=1.3,
        every axis/.append style={
            line width=1.5pt,
        },
    }
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        width=\linewidth,
        height=8cm,
        date coordinates in=x,
        date ZERO=2017-01-01,
        xlabel=Month of year,
        ylabel=Temperature,
        y unit=\si{\celsius},
        xmin=2017-01-01,
        xmax=2018-01-01,
        xtick={2017-01-01, 2017-02-01, 2017-03-01, 2017-04-01, 2017-05-01, 2017-06-01, 2017-07-01, 2017-08-01, 2017-09-01, 2017-10-01, 2017-11-01, 2017-12-01},
        % don't show the labels here ...
        xticklabels={},
        % ... but at the 15th of every month ...
        extra x ticks={2017-01-15, 2017-02-15, 2017-03-15, 2017-04-15, 2017-05-15, 2017-06-15, 2017-07-15, 2017-08-15, 2017-09-15, 2017-10-15, 2017-11-15, 2017-12-15},
        % ... with the corresponding month number
        extra x tick label=\month,
        grid=major,
        grid style={dashed,gray!30},
        % but don't show the grid or the tick for the `extra ticks'
        extra x tick style={
            grid=none,
            major tick length=0pt,
        },
        no markers,
    ]
%        \addplot table[x=Day,y=T_min, col sep=comma] {tables/Temperatures.csv};
        % (borrowed from marmot's answer)
        \addplot coordinates {
            (2017-01-01,1) (2017-02-01,2) (2017-03-01,2)
            (2017-04-01,3) (2017-05-01,3) (2017-06-01,4)
            (2017-07-01,4) (2017-08-01,4) (2017-09-01,3)
            (2017-10-01,3) (2017-11-01,2) (2017-12-01,1)
            (2018-01-01,1)
        };
        \legend{$T_{\min}$}
    \end{axis}
\end{tikzpicture}
\end{document}

该图显示了上述代码的结果

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