我将 3D 数据集绘制为曲面图，但有时我需要通过限制 x 值或 y 值来显示曲面图的一部分。
我已经提供了 MWE，显示
- 表面图
- 限制为 2 个 x 值的网格图
- 网格图限制为 1 个 x 值
- 对 x 值没有限制的 2D 图，结果是投影而不是切片
- 我想要的结果是通过手动编辑表格来删除所需 x 域之外的点
图 2 和图 3 仅用于说明为什么使用 似乎无法实现这一点\addplot3；仅包含一个 x 值的域不会绘制任何数据，而包含两个 x 值的域不出所料地显示表面的 3D 部分投影，而不是 2D 切片。我猜图 4（使用\addplot）就是这样做的，但我不知道在仅使用第 1 列和第 2 列时如何限制第 0 列的值。图 5 显示了执行此操作的“强力”方法。我想避免这样做，因为我有多个大型数据集，使用外部数据处理来提取我想要查看的切片会变得非常麻烦，并且需要为每个数据集提供多个文件。
梅威瑟：
\documentclass{article}
\usepackage{tikz,pgfplots}
\begin{document}
\begin{figure}
%Surface plot
\begin{tikzpicture}
\begin{axis}[mesh/cols=3]
\addplot3[surf] table[ x index=0, y index=1, z index=2 ] {
0 0 1
0 1 2
0 2 3
1 0 1.5
1 1 2.5
1 2 3.5
2 0 3
2 1 4
2 2 5
};
\end{axis}
\end{tikzpicture}
%subset of surface plot encompassing 2 x-values
\begin{tikzpicture}
\begin{axis}[mesh/cols=3,
restrict x to domain = 1:2,
view = {90}{0}
]
\addplot3[mesh,black] table[ x index=0, y index=1, z index=2 ] {
0 0 1
0 1 2
0 2 3
1 0 1.5
1 1 2.5
1 2 3.5
2 0 3
2 1 4
2 2 5
};
\end{axis}
\end{tikzpicture}
%subset of surface plot encompassing 1 x-value
\begin{tikzpicture}
\begin{axis}[mesh/cols=3,
restrict x to domain = 1:1,
view = {90}{0}
]
\addplot3[mesh,black] table[ x index=0, y index=1, z index=2 ] {
0 0 1
0 1 2
0 2 3
1 0 1.5
1 1 2.5
1 2 3.5
2 0 3
2 1 4
2 2 5
};
\end{axis}
\end{tikzpicture}
% 2-D plot with no restriction on x-values
\begin{tikzpicture}
\begin{axis}[mesh/cols=3]
\addplot[] table[ x index=1, y index=2 ] {
0 0 1
0 1 2
0 2 3
1 0 1.5
1 1 2.5
1 2 3.5
2 0 3
2 1 4
2 2 5
};
\end{axis}
\end{tikzpicture}
%The result I want to achieve
\begin{tikzpicture}
\begin{axis}[mesh/cols=3]
\addplot[] table[ x index=1, y index=2 ] {
1 0 1.5
1 1 2.5
1 2 3.5
};
\end{axis}
\end{tikzpicture}
\end{figure}
答案1
mesh如果您只想画一条线，则需要删除该选项。
下面是一个使用稍微更有趣的数据集的示例，取自如何根据数据文件绘制网格？
\documentclass{article}
\usepackage{pgfplots, pgfplotstable, filecontents}
\begin{filecontents}{data.dat}
x y z
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-8 -7 -0.0878605757706669
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-8 -5 -0.000975520434412708
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-8 -4 0.0516786593150782
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-8 -3 0.0902658710255413
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-8 2 0.112058624112819
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-8 3 0.0902658710255413
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-8 4 0.0516786593150782
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\end{filecontents}
\begin{document}
%Surface plot
\begin{tikzpicture}
\begin{axis}[colormap/blackwhite, faceted color=gray, view={-45}{30},
zmin=-0.3, zmax=1,
mesh/ordering=y varies, mesh/cols=15]
\addplot3[surf,z buffer=sort, restrict x to domain={-2:0}] table[ x index=0, y index=1, z index=2 ] {data.dat};
\addplot3[restrict x to domain={-2:-2},line width=3pt, orange] table[ x index=0, y index=1, z index=2 ] {data.dat};
\addplot3[surf, z buffer=sort, restrict x to domain={-4:-2}] table[ x index=0, y index=1, z index=2 ] {data.dat};
\addplot3[restrict x to domain={-4:-4}, line width=3pt, red] table[ x index=0, y index=1, z index=2 ] {data.dat};
\addplot3[surf, z buffer=sort, restrict x to domain={-8:-4}] table[ x index=0, y index=1, z index=2 ] {data.dat};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[
view={90}{0},
zmin=-0.3, zmax=1,
]
\addplot3[thick, red, restrict x to domain={-4:-4}] table[ x index=0, y index=1, z index=2] {data.dat};
\addplot3[thick, orange, restrict x to domain={-2:-2}] table[ x index=0, y index=1, z index=2] {data.dat};
\end{axis}
\end{tikzpicture}
\end{document}