我尝试编译以下代码来绘制由值数组定义的一些函数的图形。
代码如下
\documentclass[margin=3mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\pgfplotstableread[col sep=comma]{
-1, 1, -3.88461538461538,10.8768115942029,-49.37372620793093, 175.3383368168327,
-0.35714286, 1, -3.24175824175824,6.566474415853299,-23.612493710583458, 55.10682373726086,
0.28571429, 1, -2.59890109890110,3.082667849748595, -6.732218933226122, -2.520938957827919,
0.92857143, 1, -1.95604395604396,0.4253918958887899, 2.8611214477562354, -19.7847951798583,
1.57142857, 1, -1.31318681318681,-1.4053534457261168,6.761550755978779, -14.825671722387444,
2.21428571, 1, -0.67032967032967,-2.409568175096126, 6.563092315056663, -1.6855782611049153,
2.85714286, 1, -0.02747252747252,-2.5872522922212347, 3.859769448605049, 9.692392646167214,
3.5, 1, 0.61538461538461, -1.9384057971014481, 0.24560548023911766, 13.464065559474449,
4.14285714, 1, 1.25824175824176, -0.4630286897367631, -2.6853762664260006, 7.884182156729922,
4.78571429, 1, 1.90109890109890, 1.838879029872821, -3.339152467775138, -4.693598766285728,
5.42857143, 1, 2.54395604395604, 4.967317361727301, -0.12169980019311577, -17.8167012959243,
6.07142857, 1, 3.18681318681319, 8.922286305826688, 8.561005059935194, -20.933632400670078,
6.71428571, 1, 3.82967032967033, 13.703785862170964, 24.302985436225047, 0.606018068859953,
7.35714286, 1, 4.47252747252747, 19.31181603076014, 48.698264652291485, 65.55157737991703,
8, 1, 5.11538461538462, 25.746376811594203,83.34086603174967 ,196.75128991761915,
}\loadedtable
\begin{tikzpicture}
\begin{axis}[
axis lines=center,
xmin=-1.5, xmax=8.5,
ymin=-50, ymax=190,
axis on top,
xtick distance=1,
ytick distance=20,
tick label style={font=\footnotesize, inner sep=1pt, fill=white},
no marks, samples=15,
every axis plot post/.append style={very thick}
]
\addplot table[x index=0,y index=1] {\loadedtable};
\addplot table[x index=0,y index=2] {\loadedtable};
\addplot table[x index=0,y index=3] {\loadedtable};
\addplot table[x index=0,y index=4] {\loadedtable};
\addplot table[x index=0,y index=5] {\loadedtable};
\end{axis}
\end{tikzpicture}
\end{document}
结果：
我希望图形表示不呈锯齿状。请提供想法。
答案1
- 看来你问题中的代码是基于我的回答 对于您之前的问题，但您没有接受它也没有赞成...如果您现在这样做，那将会很好也很公平。
- 样本数量太少，函数曲线看起来会更平滑，因此，您需要在给定的样本之间插入它们的值。
- 这可以通过宏来实现
smooth，该宏通过使用样条函数在给定样本之间插值函数。 smooth您可以添加到轴选项的宏：
\documentclass[margin=3mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\pgfplotstableread[col sep=comma]{
-1, 1, -3.88461538461538, 10.8768115942029, -49.37372620793093, 175.3383368168327,
-0.35714286, 1, -3.24175824175824, 6.566474415853299, -23.612493710583458, 55.10682373726086,
0.28571429, 1, -2.59890109890110, 3.082667849748595, -6.732218933226122, -2.520938957827919,
0.92857143, 1, -1.95604395604396, 0.4253918958887899, 2.8611214477562354, -19.7847951798583,
1.57142857, 1, -1.31318681318681, -1.4053534457261168, 6.761550755978779, -14.825671722387444,
2.21428571, 1, -0.67032967032967, -2.409568175096126, 6.563092315056663, -1.6855782611049153,
2.85714286, 1, -0.02747252747252, -2.5872522922212347, 3.859769448605049, 9.692392646167214,
3.5, 1, 0.61538461538461, -1.9384057971014481, 0.24560548023911766, 13.464065559474449,
4.14285714, 1, 1.25824175824176, -0.4630286897367631, -2.6853762664260006, 7.884182156729922,
4.78571429, 1, 1.90109890109890, 1.838879029872821, -3.339152467775138, -4.693598766285728,
5.42857143, 1, 2.54395604395604, 4.967317361727301, -0.12169980019311577, -17.8167012959243,
6.07142857, 1, 3.18681318681319, 8.922286305826688, 8.561005059935194, -20.933632400670078,
6.71428571, 1, 3.82967032967033, 13.703785862170964, 24.302985436225047, 0.606018068859953,
7.35714286, 1, 4.47252747252747, 19.31181603076014, 48.698264652291485, 65.55157737991703,
8, 1, 5.11538461538462, 25.746376811594203, 83.34086603174967, 196.75128991761915,
}\loadedtable
\begin{tikzpicture}
\begin{axis}[
axis lines=center,
xmin=-1.5, xmax=8.5,
ymin=-50, ymax=190,
axis on top,
xtick distance=1,
ytick distance=20,
tick label style={font=\footnotesize, inner sep=1pt, fill=white},
no marks, samples=15, smooth,
every axis plot post/.append style={very thick}
]
\addplot table[x index=0,y index=1] {\loadedtable};
\addplot table[x index=0,y index=2] {\loadedtable};
\addplot table[x index=0,y index=3] {\loadedtable};
\addplot table[x index=0,y index=4] {\loadedtable};
\addplot table[x index=0,y index=5] {\loadedtable};
\end{axis}
\end{tikzpicture}
\end{document}
编辑：
但是，如果绘图时使用函数（如@Teepeemm 在其评论中所建议的那样），您将获得更好、更准确的结果，从中计算出的值会收集到表中。在这种情况下，您可以定义更多样本，例如 101 个甚至更多，而不再使用smooth宏。
例如，上述 MWE 中的第五个函数定义如下：
(x-3.5)^4-12*(x-3.5)^2+12
（我的近似值，你应该使用一个，从中计算表中收集的样本）比 MWE 可以是：
\documentclass[margin=3mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
axis lines=center,
xmin=-1.5, xmax=8.5,
ymin=-50, ymax=190,
axis on top,
xtick distance=1,
ytick distance=20,
tick label style={font=\footnotesize, inner sep=1pt, fill=white},
no marks,
domain=-1:8, samples=101, % domain and samples, no smooth macro
every axis plot post/.append style={very thick}
]
\addplot {(x-3.5)^4-12*(x-3.5)^2+12}; % my approximation of your function
% you should insert here your formula
\end{axis}
\end{tikzpicture}
\end{document}
结果是：
\addplot类似地，您可以绘制其他函数。只需在指令中使用它们的数学表达式即可。