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如何从.dat 文件绘制多个数据？

tag-icon • tag-icon tikz-pgf pgfplots
如何从.dat 文件绘制多个数据？

我正在尝试使用 pgfplots 在 latex 中绘制多列数据。我尝试获取图表，但无法绘制图表。我的代码如下，我该如何添加图例？请指导我。

\documentclass[]{article}
\usepackage{filecontents,pgfplots}

\begin{filecontents}{pistonkinetics.dat}
m0_FEED, AT 773.15K, AT 823.15K, AT 873.15K, AT 923.15K, AT 973.15K
0.005, 1.30E+04, 12959.71536,12959.71536,12959.71536,12959.71536
0.007, 1.81E+04, 18145.78478,18145.78478,18145.78478,18145.784
0.009, 2.33E+04, 23333.9541,23333.9541,23333.9541,23333.9541
0.011, 2.85E+04, 28524.71381,28524.71381,28524.71381,28524.71381
0.013, 3.37E+04, 33718.48576,33718.48576,33718.48576,33718.48576
0.015, 3.89E+04, 38915.61947,38915.61947,38915.61947,38915.61947
0.017, 4.41E+04, 44116.39602,44116.39603,44116.39603,44116.39603
0.019, 4.93E+04, 49321.02848,49321.02848,49321.02878,49321.02849
0.021, 5.45E+04, 54529.67237,54529.67238,54529.67238,54529.67238
\end{filecontents}

\begin{document}
\pgfplotstableread{mydata.dat}{\mydata}
\begin{tikzpicture}[scale=1]
\begin{axis}[minor tick num=1,
xlabel=Degrees, ylabel = temperature]
\addplot [black,very thick] table [x={m0_FEED}, y={AT 773.15K}] {\mydata};
\legend{AT773.15K}
\addplot [red,very thick] table [x={m0_FEED}, y={AT 823.15K}] {\mydata};
\legend{AT773.15K}
\addplot [blue,very thick] table [x={m0_FEED}, y={AT 873.15K}] {\mydata};
\legend{AT873.15K}
\addplot [green,very thick] table [x={m0_FEED}, y={AT 923.15K}] {\mydata};
\legend{AT923.15K}
\addplot [dashed,yellow,very thick] table [x={m0_FEED}, y={AT 973.15K}] {\mydata};
\legend{AT973.15K}
\end{axis}
\end{tikzpicture}
\end{document}

答案1

pgfplotstable假设列以空格分隔，当您使用逗号作为列分隔符时，您需要指定它：

\pgfplotstableread[col sep=comma]{mydata.dat}{\mydata}

对于传奇来说：

\legend{a,b,c}

或多个实例\addlegendentry，例如

\addlegendentry{a}
\addlegendentry{b}
\addlegendentry{c}

如果您还没有，我还建议您将其放在\pgfplotsset{compat=1.3}序言中compat=<some higher version number>。 明显的好处是 ylabel 可以得到更好的位置。

以下代码的输出

\documentclass[border=5mm]{standalone}
\usepackage{filecontents,pgfplots}
\pgfplotsset{compat=1.3} 

\begin{filecontents}{mydata.dat}
m0_FEED, AT 773.15K, AT 823.15K, AT 873.15K, AT 923.15K, AT 973.15K
0.005, 1.30E+04, 12959.71536,12959.71536,12959.71536,12959.71536
0.007, 1.81E+04, 18145.78478,18145.78478,18145.78478,18145.784
0.009, 2.33E+04, 23333.9541,23333.9541,23333.9541,23333.9541
0.011, 2.85E+04, 28524.71381,28524.71381,28524.71381,28524.71381
0.013, 3.37E+04, 33718.48576,33718.48576,33718.48576,33718.48576
0.015, 3.89E+04, 38915.61947,38915.61947,38915.61947,38915.61947
0.017, 4.41E+04, 44116.39602,44116.39603,44116.39603,44116.39603
0.019, 4.93E+04, 49321.02848,49321.02848,49321.02878,49321.02849
0.021, 5.45E+04, 54529.67237,54529.67238,54529.67238,54529.67238
\end{filecontents}

\begin{document}
\pgfplotstableread[col sep=comma]{mydata.dat}{\mydata}
\begin{tikzpicture}
\begin{axis}[
  minor tick num=1,
  xlabel=Degrees,
  ylabel = temperature
  ]
\addplot [black,very thick] table [x={m0_FEED}, y={AT 773.15K}] {\mydata};
\addlegendentry{AT773.15K}
\addplot [red,very thick] table [x={m0_FEED}, y={AT 823.15K}] {\mydata};
\addlegendentry{AT823.15K}
\addplot [blue,very thick] table [x={m0_FEED}, y={AT 873.15K}] {\mydata};
\addlegendentry{AT873.15K}
\addplot [green,very thick] table [x={m0_FEED}, y={AT 923.15K}] {\mydata};
\addlegendentry{AT923.15K}
\addplot [dashed,yellow,very thick] table [x={m0_FEED}, y={AT 973.15K}] {\mydata};
\addlegendentry{AT973.15K}

% for the legend entries you can alternatively use
% \legend{AT773.15K, AT823.15K, AT873.15K, AT923.15K, AT973.15K}
\end{axis}
\end{tikzpicture}
\end{document}

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