每个图的标签 PGFplots

Question

给出下图：

\begin{tikzpicture} 
 \begin{axis}[ybar, xticklabels={{Less Than 100 Bytes}, {100-1000 Bytes}, {1000-10000 Bytes}, {Greater than 10000 Bytes}}, xtick = {2, 4, 6, 8},
         width = 0.45*\textwidth,
         xtick style={draw=none},
         ymajorgrids=true,
         ylabel={Message Count}, 
         xlabel={Message Size}, xticklabel style={rotate=90},bar shift=0pt]

\addplot [draw=blue, pattern color = blue, pattern = north west lines]
                coordinates {(2, 0)}; 
                \label{plot:lessThan100}
\addplot [draw=yellow, pattern color = yellow, pattern = grid]
    coordinates{(4, 0)}; 
    \label{plot:10}
\addplot [draw=green,pattern color = green, pattern = crosshatch]
    coordinates{(6, 1256)}; 
    \label{plot:1000Bar}
\addplot [draw=black,fill = black]
    coordinates{(8, 2260)}; 
    \label{plot:GreaterThan10000}    
\end{axis}
\end{tikzpicture}

然后像这样引用标签：

less than 100 bytes~\ref*{plot:lessThan100}, 100-1000 bytes~\ref*{plot:10}, 1000-10000 bytes~\ref*{plot:1000Bar} and greater than 10000 bytes~\ref*{plot:GreaterThan10000}. 

但它正确呈现了第二个标签：

这是怎么回事？

Answer 1

遗憾的是，您没有提供（完整）最小工作示例（MWE），所以当我添加缺失的东西时，一切都正常。

% used PGFPlots v1.15
\documentclass[border=5pt,varwidth]{standalone}
\usepackage{pgfplots}
    \usetikzlibrary{
        patterns,
    }
    \pgfplotsset{
        compat=1.15,
    }
\begin{document}
less than 100 bytes~\ref{plot:lessThan100}, 100-1000 bytes~\ref{plot:10},
1000-10000 bytes~\ref{plot:1000Bar} and
greater than 10000 bytes~\ref{plot:GreaterThan10000}.

\begin{tikzpicture}
    \begin{axis}[
        ybar,
        xticklabels={
            {Less Than 100 Bytes},
            {100-1000 Bytes},
            {1000-10000 Bytes},
            {Greater than 10000 Bytes}
        },
        xtick = {2, 4, 6, 8},
        width = 0.45*\textwidth,
        xtick style={draw=none},
        ymajorgrids=true,
        ylabel={Message Count},
        xlabel={Message Size},
        xticklabel style={rotate=90},
        bar shift=0pt,
    ]

        \addplot [draw=blue, pattern color = blue, pattern = north west lines]
            coordinates {(2, 0)};
                \label{plot:lessThan100}
        \addplot [draw=yellow, pattern color = yellow, pattern = grid]
            coordinates{(4, 0)};
                \label{plot:10}
        \addplot [draw=green,pattern color = green, pattern = crosshatch]
            coordinates{(6, 1256)};
                \label{plot:1000Bar}
        \addplot [draw=black,fill = black]
            coordinates{(8, 2260)};
                \label{plot:GreaterThan10000}
    \end{axis}
\end{tikzpicture}
\end{document}