箱线图略微移动，取决于上须

Question

我创建了一些应该相互对齐的箱线图。我注意到，如果上部晶须为“5“。如果上部晶须为 4.99，则不会发生这种情况。有什么想法为什么会发生这种情况以及如何解决它？

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\usepgfplotslibrary{statistics}

\begin{document}
    \begin{figure}
    \centering
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\one},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                ]
                \addplot+[boxplot,  draw=black,
                boxplot prepared={
                    median=50,
                    upper quartile=50,
                    lower quartile=49,
                    upper whisker=56,
                    lower whisker=40
                }, 
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                % xmin = 2.5,
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\two},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                ]
                \addplot+[boxplot, draw=black,
                boxplot prepared={
                    median=4,
                    upper quartile=4,
                    lower quartile=3,
                    upper whisker=5, %4.99 --> not moving to the left
                    lower whisker=3
                },
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\three},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                ]
                \addplot+[boxplot, draw=black,
                boxplot prepared={
                    median=2,
                    upper quartile=3,
                    lower quartile=2,
                    upper whisker=7,
                    lower whisker=1
                },
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
    \caption{todo}  
    \end{figure}
\end{document}

// 编辑：此最小示例的一个解决方案是将最小值放入xmin = 2.5,图的标题中。该xmax值再次破坏了对齐。它对我的大型 tex 文档也有帮助，但仍然没有完美对齐。

Answer 1

嗯，问题在于“外部” xtick 5.2。您可以通过将样式设置为覆盖来抑制效果（但随后您必须在绘图下方添加空间），或者您可以明确设置 xtick：

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\usepgfplotslibrary{statistics}

\begin{document}
    \begin{figure}
    \centering
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\one},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                ]
                \addplot+[boxplot,  draw=black,
                boxplot prepared={
                    median=50,
                    upper quartile=50,
                    lower quartile=49,
                    upper whisker=56,
                    lower whisker=40
                },
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                % xmin = 2.5,
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\two},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                %xticklabel style={overlay},   %also possible             
                xtick={3,3.2,...,5} %<------
                ]
                \addplot+[boxplot, draw=black,
                boxplot prepared={
                    median=4,
                    upper quartile=4,
                    lower quartile=3,
                    upper whisker=5, %4.99 --> not moving to the left
                    lower whisker=3
                },
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
        \begin{tikzpicture}
            \begin{axis}
                [
                ytick={1},
                yticklabel style={text width=2.0cm, align=right},
                yticklabels={plot\\three},
                width=(\textwidth-1.0cm),
                height=2.7cm,
                ybar,
                xmajorgrids=true,
                grid style=dashed,
                ]
                \addplot+[boxplot, draw=black,
                boxplot prepared={
                    median=2,
                    upper quartile=3,
                    lower quartile=2,
                    upper whisker=7,
                    lower whisker=1
                },
                ] coordinates {};
            \end{axis}
        \end{tikzpicture}
    \caption{todo}
    \end{figure}
\end{document}