我想使用插值法根据文件中的数据制作热图或密度图。我一直在测试 pgfplots 手册中的不同选项（第 4.6.7 节“具有显式颜色的表面图”），但未能找到解决方案。
例如，以下内容给出编译错误：
\documentclass{article}
% \usepackage{pstricks-add}
% \usepackage[svgnames,pdf]{pstricks}
%
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.15}
\usepgfplotslibrary{patchplots}
\usepackage{filecontents}
\usepackage{pgfplotstable}
\begin{filecontents*}{dfsa3c.dat}
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\end{filecontents*}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xlabel=$x$,
ylabel=$y$,
zlabel={$f(x,y) = x\cdot y$},
title=DFSA,
small,view={0}{90},colorbar,
]
\addplot3 [surf,
% shader=interp,
patch type=bilinear,
% mesh/color input=explicit,
]
table {dfsa3c.dat};
\end{axis}
\end{tikzpicture}
\end{document}
我想要得到这样的情节：
我想让颜色之间的过渡更平滑一些，或者只是用 TikZ 实现这个图。颜色图并不重要，但选择好的颜色图可能会提高绘图质量。
答案1
如果你不想重组数据文件，你也可以使用其中一个键
mesh/colsmesh/rows具有相应的值，在本例中为19。
% used PGFPlots v1.17
\begin{filecontents*}{dfsa3c.dat}
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\end{filecontents*}
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
% (use this `compat` level or higher to make use of the advanced label positioning)
\pgfplotsset{compat=1.3}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
xlabel=$x$,
ylabel=$y$,
zlabel={$f(x,y) = x\cdot y$},
title=DFSA,
small,
view={0}{90},
colorbar,
]
\addplot3 [
surf,
% shader=interp,
mesh/cols=19, % <-- added
] table {dfsa3c.dat};
\end{axis}
\end{tikzpicture}
\end{document}
答案2
如果添加所需的空行，则不会出现错误。
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.15}
\usepgfplotslibrary{patchplots}
\usepackage{filecontents}
\begin{filecontents*}{dfsa3c.dat}
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\end{filecontents*}
\begin{document}
\centering
\begin{tikzpicture}
\begin{axis}[
xlabel=$x$,
ylabel=$y$,
zlabel={$f(x,y) = x\cdot y$},
title=DFSA,
small,view={0}{90},colorbar,
]
\addplot3 [surf,
% shader=interp,
patch type=bilinear,
% mesh/color input=explicit,
]
table {dfsa3c.dat};
\end{axis}
\begin{axis}[xshift=8cm,
xlabel=$x$,
ylabel=$y$,
title=DFSA,
small,view={0}{90},colorbar,
]
\addplot3 [surf,
shader=interp,
]
table {dfsa3c.dat};
\end{axis}
\end{tikzpicture}
\end{document}
