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将噪声添加到分段常数函数中

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将噪声添加到分段常数函数中

是否可以向以下分段常数函数中添加噪声？

数据：

time    energy
0       0
1       0
2       0
3       0
4       0
5       0
6       0
7       0
8       0
9       0
10      1.8
12      1.8
13      1.8
14      1.8
15      1.8
16      0.8
17      0.8
18      0.8
19      0.8
20      0.8
21      0.8
22      0.8
23      0.8
24      0.8
25      0.3
26      0.3
27      0.3
28      0.3
29      0.3
30      0.3
31      0.3
32      0.3
33      0.3
34      0.3
36      0.3
37      0.3
38      0.3
39      0.3
40      0.3
41      0.3
42      0.3
43      0.3
44      0.3
45      0.3
46      0.3

代码：

\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=newest}

\begin{document}

\pgfplotstableread
{energy.dat}
{\table}
\begin{tikzpicture}
\begin{axis}[
ymin=0,
minor tick num=4,
enlarge x limits=false,
axis on top,
every axis plot post/.append style=
{mark=none},
const plot,
legend style={
area legend,
at={(0.5,-0.15)},
anchor=north,
legend columns=-1}]
\addplot[draw=blue,fill=blue!30!white]
table[x=time,y=energy] from \table
\closedcycle;
\legend{energy}
\end{axis}
\end{tikzpicture}

\end{document}

答案1

y expr=\thisrow{energy}+0.1*rnd您可以通过设置而不是y=energy（例如）来向表的值添加一些噪音。

\documentclass{article}
\usepackage{tikz}
\usepackage{pgfplots, pgfplotstable}
\pgfplotsset{width=7cm,compat=newest}

\begin{document}

\pgfplotstableread
{
time    energy
0       0
1       0
2       0
3       0
4       0
5       0
6       0
7       0
8       0
9       0
10      1.8
12      1.8
13      1.8
14      1.8
15      1.8
16      0.8
17      0.8
18      0.8
19      0.8
20      0.8
21      0.8
22      0.8
23      0.8
24      0.8
25      0.3
26      0.3
27      0.3
28      0.3
29      0.3
30      0.3
31      0.3
32      0.3
33      0.3
34      0.3
36      0.3
37      0.3
38      0.3
39      0.3
40      0.3
41      0.3
42      0.3
43      0.3
44      0.3
45      0.3
46      0.3
}
{\table}
\begin{tikzpicture}
\begin{axis}[
ymin=0,
minor tick num=4,
enlarge x limits=false,
axis on top,
every axis plot post/.append style=
{mark=none},
const plot,
legend style={
area legend,
at={(0.5,-0.15)},
anchor=north,
legend columns=-1}]
\addplot[draw=blue,fill=blue!30!white]
table[y expr=\thisrow{energy}+(rnd/10),x=time] \table
\closedcycle;
\legend{energy}
\end{axis}
\end{tikzpicture}

\end{document}

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