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我怎样才能将指数值更改为十进制？

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我怎样才能将指数值更改为十进制？

我想让我的图完全以十进制表示。我使用了函数

\pgfkeys{
    /pgf/number format/precision=1, 
    /pgf/number format/fixed zerofill=true
}

使我的小数变成 2.0，而不是只有 2。现在我面临的问题是，我的值从 0.2 变为 2.0 x10exp2。我希望它恢复到 0.2。请帮忙。代码和图片已给出。<code>使用 pgfkeys 函数后的绘图</code>

\begin{figure}[htb!]
\centering
\begin{tikzpicture}
\pgfkeys{
     /pgf/number format/precision=1, 
    /pgf/number format/fixed zerofill=true
}
\begin{axis}[
ybar, ymax=4, ymin=0,
%enlargelimits=0.10,
legend style={at={(0.5,-0.20)},
anchor=north,legend columns=-1},
ylabel={Surface Roughness (nm)},
xlabel={Substrate},
symbolic x coords={Glass,Silicon,PEN},
xtick=data,
nodes near coords,
nodes near coords align={vertical},
]
\addplot [fill= white] coordinates {(Glass,2.4) (Silicon,1.1) (PEN,1.8)};
\addplot [fill = black] coordinates  {(Glass,1.1) (Silicon,0.2) (PEN,1.0)};

\legend{Profilometer,AFM}
\end{axis}
\end{tikzpicture} 
\caption{Substrate Vs IBD Surface Roughness(Avg)}
\label{Subvibd}
\end{figure}

答案1

该键fixed zerofill仅适用于也使用该样式的数字fixed（这有点令人困惑）。因此，如果您设置

\pgfkeys{
     /pgf/number format/precision=1, 
    /pgf/number format/fixed zerofill=true,
    /pgf/number format/fixed
}

你会得到期望的输出：

    \documentclass{article}
    \usepackage{pgfplots}
    \begin{document}
\begin{tikzpicture}
\pgfkeys{
     /pgf/number format/precision=1, 
    /pgf/number format/fixed zerofill=true,
    /pgf/number format/fixed
}
\begin{axis}[
ybar, ymax=4, ymin=0,
%enlargelimits=0.10,
legend style={at={(0.5,-0.20)},
anchor=north,legend columns=-1},
ylabel={Surface Roughness (nm)},
xlabel={Substrate},
symbolic x coords={Glass,Silicon,PEN},
xtick=data,
nodes near coords,
nodes near coords align={vertical},
]
\addplot [fill= white] coordinates {(Glass,2.4) (Silicon,1.1) (PEN,1.8)};
\addplot [fill = black] coordinates  {(Glass,1.1) (Silicon,0.2) (PEN,1.0)};

\legend{Profilometer,AFM}
\end{axis}
\end{tikzpicture} 
    \end{document}

答案2

一种方法是利用siunitx包装类似于： pgfplots：设置坐标附近节点的科学数字格式的指数

代码：

\documentclass[png,tikz,border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\usepackage{siunitx}

\begin{document}

\begin{tikzpicture}
\pgfkeys{
     /pgf/number format/precision=1, 
    /pgf/number format/fixed zerofill=true
}
\begin{axis}[
ybar, ymax=4, ymin=0,
%enlargelimits=0.10,
legend style={at={(0.5,-0.20)},
anchor=north,legend columns=-1},
ylabel={Surface Roughness (nm)},
xlabel={Substrate},
symbolic x coords={Glass,Silicon,PEN},
xtick=data,
nodes near coords={\pgfmathfloattofixed{\pgfplotspointmeta}% Convert floating point to fixed point
        \num[
            round-mode=places,
            round-precision = 1,
        ]{\pgfmathresult}},
nodes near coords align={vertical},
]
\addplot [fill= white] coordinates {(Glass,2.4) (Silicon,1.1) (PEN,1.8)};
\addplot [fill = black] coordinates  {(Glass,1.1) (Silicon,0.2) (PEN,1.0)};

\legend{Profilometer,AFM}
\end{axis}
\end{tikzpicture}

\end{document}

结果： 在此处输入图片描述

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