如何避免条形图中的数值自动四舍五入？

Question

下面的 latex 代码对条形图的值进行了四舍五入。我需要这些值保持完整。例如，0.8197 不应四舍五入为 0.82。

\documentclass[varwidth=true, border=2pt]{standalone}

\usepackage{pgfplots}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            symbolic x coords={baseline, seq\_1,  seq\_2, seq\_3, seq\_4},
            xtick=data,
       nodes near coords,
          ]
            \addplot[ybar,fill=blue] coordinates {
                (baseline,   0.8197)
                (seq\_1,  0.7006)
                (seq\_2,  0.5134)
                 (seq\_3,   0.8314)
                  (seq\_4,   0.8449)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}

Answer 1

添加/pgf/number format/.cd,fixed,precision=4选项axis以使用具有 4 位精度的固定数字格式。请参阅pgfmanualv3.0.1a 第 92 节 p946

编辑

正如 Peter Grill 所指出的，/pgf/number format/.cd,fixed,precision=4作用于整个轴，因此倾向于every node near coord/.append style={/pgf/number format/.cd, fixed,precision=4} 仅将此特定格式应用于条形图顶部的数字。

\documentclass[varwidth=true, border=2pt]{standalone}

\usepackage{pgfplots}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            symbolic x coords={baseline, seq\_1,  seq\_2, seq\_3, seq\_4},
            xtick=data,
            nodes near coords,
            every node near coord/.append style={/pgf/number format/.cd, fixed,precision=4}
          ]
            \addplot[ybar,fill=blue] coordinates {
                (baseline,   0.8197)
                (seq\_1,  0.7006)
                (seq\_2,  0.5134)
                (seq\_3,   0.8314)
                (seq\_4,   0.8449)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}

Answer 2

默认情况下nodes near coords打印\pgfmathprintnumber\pgfplotspointmeta。你可以告诉它precision=4使用

nodes near coords={\pgfmathprintnumber[precision=4]{\pgfplotspointmeta}}

而不仅仅是

nodes near coords

\documentclass[border=2pt]{standalone}

\usepackage{pgfplots}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            symbolic x coords={baseline, seq\_1,  seq\_2, seq\_3, seq\_4},
            xtick=data,
            nodes near coords={\pgfmathprintnumber[precision=4]{\pgfplotspointmeta}},
          ]
            \addplot[ybar,fill=blue] coordinates {
                (baseline,   0.8197)
                (seq\_1,  0.7006)
                (seq\_2,  0.5134)
                (seq\_3,   0.8314)
                (seq\_4,   0.8449)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}