我正在尝试在我的图上添加注释，并尝试将其设置为双行。我尝试遵循#123671，使用答案的第二个选项，即向align=left最后一个节点添加一个属性，但会导致一堆错误。
\documentclass[tikz, border = 5pt]{standalone}
\usepackage{siunitx}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}
\begin{axis}[
title={Resposta em frequência},
width=4.396in,
height=3.357in,
at={(0.883in,0.481in)},
scale only axis,
separate axis lines,
every outer x axis line/.append style={white!40!black},
every x tick label/.append style={font=\color{white!40!black}},
every x tick/.append style={white!40!black},
xmode=log,
xmin=1000,
xmax=10000000,
xminorticks=true,
grid=both,
xlabel={Frequência (rad/s)},
every outer y axis line/.append style={white!40!black},
every y tick label/.append style={font=\color{white!40!black}},
every y tick/.append style={white!40!black},
ymin=-70,
ymax=0,
ylabel={Magnitude (dB)},
axis background/.style={fill=white},
legend style={legend cell align=left, align=left, draw=white!15!black}
]
\addplot [color=mycolor1, forget plot]
table[row sep=crcr]{
1e-20 1.54292394648526e-14\\
6.66666666666759e-13 1.54292394648526e-14\\
6.66666666666759e-08 1.54292394648526e-14\\
0.000666666666666758 1.3500584531746e-14\\
0.666666666666759 -8.26708293805402e-11\\
66.6666666666759 -8.26870011337924e-07\\
666.666666666759 -8.26864051082017e-05\\
778.890771786889 -0.000112867420555789\\
910.006251562037 -0.000154064535941829\\
1063.19320741493 -0.000210298517218128\\
1242.16706682281 -0.000287057571002689\\
1451.26869804862 -0.000391832834011076\\
1695.56969443962 -0.000534849219037435\\
1980.99538188053 -0.000730062865054596\\
2314.46853284847 -0.000996522438065902\\
2704.07727273984 -0.00136022707769961\\
3159.27125090315 -0.00185666252023427\\
3691.09083434961 -0.0025342640882715\\
4312.43488305253 -0.00345914868513465\\
5038.37360151153 -0.00472159019481194\\
5886.51405454719 -0.00644490524305459\\
6877.42721261999 -0.00879770872706377\\
8035.14688431749 -0.0120109680452925\\
9387.75263721931 -0.0164020856230169\\
10968.0508454207 -0.022409674821438\\
12814.3703819796 -0.0306453313338698\\
14971.4922551726 -0.0419734862598124\\
17491.7357361468 -0.0576386196036108\\
20436.2273211267 -0.0794715716557583\\
23876.3833058438 -0.110221676794693\\
27895.6419308485 -0.154070365696059\\
32591.4871095095 -0.217364278615351\\
38077.8128226072 -0.309529309282892\\
44487.6855260296 -0.44396210134712\\
51976.5715715652 -0.63845860167214\\
60726.1079193109 -0.9145567271784\\
70948.5075973192 -1.29530106922591\\
82891.7067593944 -1.80160791283656\\
96845.3781788223 -2.44842038436318\\
113147.957030528 -3.24240025243998\\
132194.849366409 -4.18227950222334\\
154448.022373859 -5.26153293861644\\
180447.209021576 -6.47193453834754\\
210822.998852379 -7.80653534878038\\
213109.73159745 -7.9035610664232\\
246312.1324298 -9.26128327747976\\
287775.370393042 -10.835190417512\\
336218.370519995 -12.5293360931429\\
392816.079154819 -14.3451584983039\\
458941.228594731 -16.2825747032065\\
536197.631617386 -18.3384872354153\\
626459.080681065 -20.5061069739647\\
731914.795266769 -22.775227454851\\
855122.519651245 -25.1332442683552\\
999070.558955123 -27.5665022462189\\
1167250.25810101 -30.0615568686588\\
1363740.68160092 -32.6060943686751\\
1593307.54801376 -35.1894426645877\\
1861518.81864921 -37.802734279119\\
2174879.74402996 -40.4388332727386\\
2540990.6435564 -43.092134131087\\
2968731.24519395 -45.7583125526517\\
3468476.05619497 -48.4340773664478\\
4052345.9885005 -51.1169487082971\\
4734502.34179533 -53.8050718508377\\
5531490.27454094 -56.4970672009555\\
6462640.0936024 -59.1919127199115\\
7550536.09542924 -61.8888535018907\\
8821564.33015925 -64.5873331695161\\
10306552.5742267 -67.2869423212165\\
12041518.0335007 -69.9873800596794\\
14068540.9118968 -72.6884254256942\\
16436785.0331718 -75.3899162640424\\
19203690.2702709 -78.091733629183\\
22436365.7036484 -80.7937903008019\\
224363657.036484 -120.792010521114\\
22436365703.6484 -200.791992541865\\
22436365703648.4 -320.791992540067\\
2.24363657036484e+17 -480.791992540067\\
1e+20 -586.753892131313\\
};
\addplot [black, mark=*, mark options={draw=black}, only marks]
coordinates {
(1.08e5,-3.01)
};
% This last node causes the error when the align=left is present, and without this property, it works fine, but the annotation keeps one-lined
\node at (axis cs:1.08e5,-3.01) [draw,align=left,anchor=north east,fill=white] {$\omega_{CROSS} = \\ 1.08\cdot10^5\SI[per-mode=symbol]{}{\radian\per\second}$};
\end{axis}
\end{tikzpicture}
\end{document}
答案1
为节点定义对齐允许您在其中换行。但在数学模式下您不能换行（via \\）。因此，您必须在节点的每一行上打开/关闭数学模式。
下面我使用了align=center(而不是left代码中的 as)。此外，我更喜欢 在科学计数法中使用\times而不是\cdot进行乘法。
\node at (axis cs:1.08e5,-3.01)
[draw, align=center, anchor=north east, fill=white] {
$\omega_{\mathrm{CROSS}} = $ \\ % <--- close math here
$1.08 \times 10^5\SI[per-mode=symbol]{}{\radian\per\second}$
};
平均能量损失
\documentclass[tikz, border = 5pt]{standalone}
\usepackage{siunitx}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}
\begin{axis}[
title={Resposta em frequência},
width=4.396in,
height=3.357in,
at={(0.883in,0.481in)},
scale only axis,
separate axis lines,
every outer x axis line/.append style={white!40!black},
every x tick label/.append style={font=\color{white!40!black}},
every x tick/.append style={white!40!black},
xmode=log,
xmin=1000,
xmax=10000000,
xminorticks=true,
grid=both,
xlabel={Frequência (rad/s)},
every outer y axis line/.append style={white!40!black},
every y tick label/.append style={font=\color{white!40!black}},
every y tick/.append style={white!40!black},
ymin=-70,
ymax=0,
ylabel={Magnitude (dB)},
axis background/.style={fill=white},
legend style={legend cell align=left, align=left, draw=white!15!black}
]
\addplot [color=mycolor1, forget plot]
table[row sep=crcr]{
1e-20 1.54292394648526e-14\\
6.66666666666759e-13 1.54292394648526e-14\\
6.66666666666759e-08 1.54292394648526e-14\\
0.000666666666666758 1.3500584531746e-14\\
0.666666666666759 -8.26708293805402e-11\\
66.6666666666759 -8.26870011337924e-07\\
666.666666666759 -8.26864051082017e-05\\
778.890771786889 -0.000112867420555789\\
910.006251562037 -0.000154064535941829\\
1063.19320741493 -0.000210298517218128\\
1242.16706682281 -0.000287057571002689\\
1451.26869804862 -0.000391832834011076\\
1695.56969443962 -0.000534849219037435\\
1980.99538188053 -0.000730062865054596\\
2314.46853284847 -0.000996522438065902\\
2704.07727273984 -0.00136022707769961\\
3159.27125090315 -0.00185666252023427\\
3691.09083434961 -0.0025342640882715\\
4312.43488305253 -0.00345914868513465\\
5038.37360151153 -0.00472159019481194\\
5886.51405454719 -0.00644490524305459\\
6877.42721261999 -0.00879770872706377\\
8035.14688431749 -0.0120109680452925\\
9387.75263721931 -0.0164020856230169\\
10968.0508454207 -0.022409674821438\\
12814.3703819796 -0.0306453313338698\\
14971.4922551726 -0.0419734862598124\\
17491.7357361468 -0.0576386196036108\\
20436.2273211267 -0.0794715716557583\\
23876.3833058438 -0.110221676794693\\
27895.6419308485 -0.154070365696059\\
32591.4871095095 -0.217364278615351\\
38077.8128226072 -0.309529309282892\\
44487.6855260296 -0.44396210134712\\
51976.5715715652 -0.63845860167214\\
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22436365703.6484 -200.791992541865\\
22436365703648.4 -320.791992540067\\
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1e+20 -586.753892131313\\
};
\addplot [black, mark=*, mark options={draw=black}, only marks]
coordinates {
(1.08e5,-3.01)
};
\node at (axis cs:1.08e5,-3.01) [draw,align=center,anchor=north east,fill=white] {$\omega_{\mathrm{CROSS}} = $ \\ $1.08\times 10^5\SI[per-mode=symbol]{}{\radian\per\second}$};
\end{axis}
\end{tikzpicture}
\end{document}