我制作了一个图表，如下图所示：
对于我想要生成的每个矩形n其中的随机点，可能吗？
我的代码：
\begin{tikzpicture}
\begin{axis}[
grid=major,
width=\textwidth,
height=\axisdefaultheight,
xlabel = Time $(s)$,
ylabel = Frequency,
xmin = 0, xmax = 13,
ymin = 0, ymax = 4000,
]
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (0,0) rectangle (40,100);
\draw[pattern=north east lines, pattern color=blue, line width=1pt] (40,0) rectangle (80,100);
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (80,0) rectangle (120,100);
\draw[pattern=north east lines, pattern color=green, line width=1pt] (0,100) rectangle (40,200);
\draw[pattern=north west lines, pattern color=green, line width=1pt] (40,100) rectangle (80,200);
\draw[pattern=north east lines, pattern color=green, line width=1pt] (80,100) rectangle (120,200);
\draw[pattern=north west lines, pattern color=red, line width=1pt] (0,200) rectangle (40,300);
\draw[pattern=north east lines, pattern color=red, line width=1pt] (40,200) rectangle (80,300);
\draw[pattern=north west lines, pattern color=red, line width=1pt] (80,200) rectangle (120,300);
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (0,300) rectangle (40,400);
\draw[pattern=north west lines, pattern color=orange, line width=1pt] (40,300) rectangle (80,400);
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (80,300) rectangle (120,400);
\end{axis}
\draw[decoration={brace,mirror,raise=15pt},decorate] (0,0) -- node[below=16pt] {\textbf{C}} (3.2,0);
\draw[decoration={brace,mirror},decorate] (10.8,0) -- node[xshift=10pt] {\rotatebox{-90}{\textbf{band}}} (10.8,1.4);
\end{tikzpicture}
答案1
编辑：我意识到我原来的答案（如下）不适用于较新版本的 pgfplots（因为与您用于矩形的明确坐标之间存在一些不匹配xmax。ymax我修复了这个问题，并且将矩形分成更小的部分。点的数量由控制samples=100。
\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{patterns}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
grid=major,
width=\textwidth,
height=\axisdefaultheight,
xlabel = Time $(s)$,
ylabel = Frequency,
xmin = 0, xmax = 130,
ymin = 0, ymax = 4000,
]
%
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (0,00) rectangle (40,1000);
\draw[pattern=north east lines, pattern color=blue, line width=1pt] (40,00) rectangle (80,1000);
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (80,00) rectangle (120,1000);
%
\draw[pattern=north east lines, pattern color=green, line width=1pt] (0,1000) rectangle (40,2000);
\draw[pattern=north west lines, pattern color=green, line width=1pt] (40,1000) rectangle (80,2000);
\draw[pattern=north east lines, pattern color=green, line width=1pt] (80,1000) rectangle (120,2000);
%
\draw[pattern=north west lines, pattern color=red, line width=1pt] (0,2000) rectangle (40,3000);
\draw[pattern=north east lines, pattern color=red, line width=1pt] (40,2000) rectangle (80,3000);
\draw[pattern=north west lines, pattern color=red, line width=1pt] (80,2000) rectangle (120,3000);
%
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (0,3000) rectangle (40,4000);
\draw[pattern=north west lines, pattern color=orange, line width=1pt] (40,3000) rectangle (80,4000);
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (80,3000) rectangle (120,4000);
\pgfplotsinvokeforeach{1,...,12}
{\pgfmathtruncatemacro{\X}{mod((#1-1),3)}
\pgfmathtruncatemacro{\Y}{int((#1-1)/3+1)}
\addplot[scatter,clip=true, clip marker paths=true,
only marks, mark=*, samples=100,point meta=int(#1)
]({20+40*\X+20*rand},{-500+1000*\Y+500*rand});}
\end{axis}
\draw[decoration={brace,mirror,raise=15pt},decorate] (0,0) -- node[below=16pt] {\textbf{C}} (3.2,0);
\draw[decoration={brace,mirror},decorate] (10.8,0) -- node[xshift=10pt] {\rotatebox{-90}{\textbf{band}}} (10.8,1.4);
\end{tikzpicture}
\end{document}
原始答案（对于旧版本的 pgfplots，从您的代码生成屏幕截图）：我不太确定您说的是哪个矩形。这个答案将它们视为较大的矩形，即从 到 的矩形x=0，x=12但我很乐意为您划分它们。我还取了n=100，它由 控制samples=100。
\documentclass[tikz,border=3.14mm]{standalone}
\usetikzlibrary{patterns}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
grid=major,
width=\textwidth,
height=\axisdefaultheight,
xlabel = Time $(s)$,
ylabel = Frequency,
xmin = 0, xmax = 13,
ymin = 0, ymax = 4000,
]
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (0,0) rectangle (40,100);
\draw[pattern=north east lines, pattern color=blue, line width=1pt] (40,0) rectangle (80,100);
\draw[pattern=north west lines, pattern color=blue, line width=1pt] (80,0) rectangle (120,100);
\draw[pattern=north east lines, pattern color=green, line width=1pt] (0,100) rectangle (40,200);
\draw[pattern=north west lines, pattern color=green, line width=1pt] (40,100) rectangle (80,200);
\draw[pattern=north east lines, pattern color=green, line width=1pt] (80,100) rectangle (120,200);
\draw[pattern=north west lines, pattern color=red, line width=1pt] (0,200) rectangle (40,300);
\draw[pattern=north east lines, pattern color=red, line width=1pt] (40,200) rectangle (80,300);
\draw[pattern=north west lines, pattern color=red, line width=1pt] (80,200) rectangle (120,300);
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (0,300) rectangle (40,400);
\draw[pattern=north west lines, pattern color=orange, line width=1pt] (40,300) rectangle (80,400);
\draw[pattern=north east lines, pattern color=orange, line width=1pt] (80,300) rectangle (120,400);
\pgfplotsinvokeforeach{1,2,3,4}
{\addplot[scatter,clip=true, clip marker paths=true,
only marks, mark=*, samples=100,point meta=int(y/1000)
]({6+6*rand},{-500+1000*#1+500*rand});}
\end{axis}
\draw[decoration={brace,mirror,raise=15pt},decorate] (0,0) -- node[below=16pt] {\textbf{C}} (3.2,0);
\draw[decoration={brace,mirror},decorate] (10.8,0) -- node[xshift=10pt] {\rotatebox{-90}{\textbf{band}}} (10.8,1.4);
\end{tikzpicture}
\end{document}
