如何在条形图中绘制水平线？

Question

我想在条形图中画一条水平线。但是，我得到的结果并不令人满意（如下图所示）。

我不知道如何修改代码才能达到以下效果：

1. 删除两边的节点值3.0；
2. 在线的下方中央添加一个‘中性’字样（图中字样为我自己添加的）；
3. 将线延伸至两侧边界。

有人能帮助我吗？

\begin{filecontents*}{data.csv}
x,ave,med
Launch,3.93,4
Options,4,4
Text Input,4.38,4
Text Display,3.35,3.5
Fixed-item List,3.44,3
Dynamic-item List,4.32,4
\end{filecontents*}

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
% \usepgfplotslibrary{statistics}
\pgfplotsset{compat=1.14}
% \usepackage{tikz}
\usetikzlibrary{patterns}

\begin{document}

\begin{figure}[tb]
\centering
\hspace*{-0.32cm}
\begin{tikzpicture}[font=\scriptsize]
    \begin{axis}[ybar,
    height=4.5cm,width=9cm,
    ymin=0,ymax=6,
    ylabel style = {align=center},
    ylabel={\# relevant score},
    ytick={1,...,5},
    symbolic x coords={Launch,Options,Text Input,
    Text Display,Fixed-item List,Dynamic-item List},
    xticklabels={,Launch,Options,Text Input,
    Text\\ Display,Fixed-\\item List,Dynamic-\\item List},
    xticklabel style={align=center},
    nodes near coords, 
    nodes near coords align={vertical},
    nodes near coords style={/pgf/number format/fixed,/pgf/number format/fixed zerofill,/pgf/number format/precision=2},
    every node near coord/.append style={font=\scriptsize},
    ]
    \addplot table [x=x,y=ave,col sep=comma]{data.csv};
    \addplot[red,line legend,sharp plot,
    update limits=false] coordinates {(Launch,3) (Dynamic-item List,3)};
    \end{axis}

    \begin{axis}[
        axis x line={none},
        ymin=0,ymax=6,
        ytick={1,...,5},
        height=4.5cm,width=9cm,
    ]
    \addplot[only marks,mark=*,mark size=2pt,magenta,
            ] table [x expr=\coordindex,y=med,col sep=comma]{data.csv};
    \end{axis}
\end{tikzpicture}
\end{figure}

\end{document}

Answer 1

怎么样

\begin{filecontents*}{data.csv} x,ave,med 启动,3.93,4 选项,4,4 文本输入,4.38,4 文本显示,3.35,3.5 固定项目列表,3.44,3 动态项目列表,4.32,4 \end{filecontents*}

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
% \usepgfplotslibrary{statistics}
\pgfplotsset{compat=1.14}
% \usepackage{tikz}
\usetikzlibrary{patterns}

\begin{document}

\begin{figure}[tb]
\centering
\hspace*{-0.32cm}
\begin{tikzpicture}[font=\scriptsize]
    \begin{axis}[ybar,
    height=4.5cm,width=9cm,
    ymin=0,ymax=6,
    ylabel style = {align=center},
    ylabel={\# relevant score},
    ytick={1,...,5},
    symbolic x coords={Launch,Options,Text Input,
    Text Display,Fixed-item List,Dynamic-item List},
    xticklabels={,Launch,Options,Text Input,
    Text\\ Display,Fixed-\\item List,Dynamic-\\item List},
    xticklabel style={align=center},
    nodes near coords, 
    nodes near coords align={vertical},
    nodes near coords style={/pgf/number format/fixed,/pgf/number format/fixed zerofill,/pgf/number format/precision=2},
    every node near coord/.append style={font=\scriptsize},
    ]
    \addplot table [x=x,y=ave,col sep=comma]{data.csv};
    \addplot[red,line legend,sharp plot,nodes near coords={},
    update limits=false,shorten >=-3mm,shorten <=-3mm] 
    coordinates {(Launch,3) (Dynamic-item List,3)} 
    node[midway,below,font=\bfseries\sffamily]{neutral};
    \end{axis}

    \begin{axis}[
        axis x line={none},
        ymin=0,ymax=6,
        ytick={1,...,5},
        height=4.5cm,width=9cm,
    ]
    \addplot[only marks,mark=*,mark size=2pt,magenta,
            ] table [x expr=\coordindex,y=med,col sep=comma]{data.csv};
    \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}