是否有一种直接的方法来创建类似下图的相关图矩阵?
该图像是 R 的一个例子corrplot
包裹使用圆圈,它还提供其他形状和配色方案来绘制这些图。理想情况下,我想用 tikz/pgfplots 来做到这一点。
这是我想以表格形式绘制的数据类型的示例。前两列是 X 和 Y 标签,第三列包含值(例如,将表示为圆的半径):
X Y value
0.7 0 0.80
1.5 0 0.80
3.8 0 0.80
9.9 0 0.80
19.7 0 0.80
0.7 1 0.61
1.5 1 0.61
3.8 1 0.64
9.9 1 0.62
19.7 1 0.61
0.7 2 0.53
1.5 2 0.54
3.8 2 0.57
9.9 2 0.53
19.7 2 0.52
0.7 5 0.52
1.5 5 0.52
3.8 5 0.55
9.9 5 0.49
19.7 5 0.49
0.7 10 0.52
1.5 10 0.53
3.8 10 0.56
9.9 10 0.50
19.7 10 0.50
答案1
以下是实现此目的的方法:
\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{colorbrewer}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
axis equal image, % We want a square grid, not a rectangular one
scatter, % This activates the color mapping
colormap/viridis, % Choose the colormap
colorbar, % Add a legend
point meta min=0,
point meta max=1,
grid=minor, % Grid lines between the intervals
minor tick num=1, % One minor tick per interval
tickwidth=0pt, % Don't draw the major tick marks
y dir=reverse, % Y increases downward
xticklabel pos=right, % X axis labels go to the top
enlargelimits={abs=0.5}, % Add half a unit on all sides
scatter/@pre marker code/.append code={% A bit of magic for scaling the circles in axis units
\pgfplotstransformcoordinatex{sqrt(abs(\pgfplotspointmeta))}% Area scales with the square of the radius
\scope[mark size=\pgfplotsunitxlength*\pgfmathresult/2, fill=mapped color]
},
scatter/@post marker code/.append code={%
\endscope%
}
]
\addplot +[
point meta=explicit, % We'll provide values for the color and size
only marks, % No lines between the points
] table [
x expr={int(mod(\coordindex+0.01,5))}, % The position depends on the coordinate index, not the X or Y values
y expr={int((\coordindex+0.01)/5))},
meta=value
] {
X Y value
0.7 0 0.80
1.5 0 0.80
3.8 0 0.80
9.9 0 0.5
19.7 0 0.08
0.7 1 0.61
1.5 1 0.61
3.8 1 0.64
9.9 1 0.62
19.7 1 0.61
0.7 2 0.53
1.5 2 0.54
3.8 2 0.57
9.9 2 0.53
19.7 2 0.52
0.7 5 0.52
1.5 5 0.52
3.8 5 0.55
9.9 5 0.49
19.7 5 0.49
0.7 10 0.52
1.5 10 0.53
3.8 10 0.56
9.9 10 0.50
19.7 10 0.50
};
\end{axis}
\end{tikzpicture}
\end{document}