我需要在同一轴上绘制 delta 函数的表示。
\begin{tikzpicture}
\begin{axis}[
xlabel=$x$,
ylabel={$\delta_{\varepsilon}(x-x_0)=\frac{1}{\sqrt{4\pi\varepsilon}}\exp\left[\frac{-(x-x_0)^2}{4\varepsilon}\right]$}, ticks= none, axis x line=bottom,axis y line=left,mark=none, ultra thick
]
% \addplot[mark=none, ultra thick, red,samples=150] {sin(deg(x))/(pi*x)};
\addplot[mark=none, thick, blue,samples=500] {exp(-(x*x)/(4*1*0.8))/sqrt(4*pi*0.8)};
\addplot[mark=none, thick, red,samples=1000] {exp(-((x)*(x))/(4*1*0.2))/sqrt(4*pi*0.2)};
\addplot[mark=none, thick, green,samples=900] {exp(-((x)*(x))/(4*1*0.04))/sqrt(4*pi*0.04)};
\draw (100pt,130pt) node [right, green] {$\varepsilon = 0.04$};
\draw (110pt,60pt) node [right, red] {$\varepsilon = 0.2$};
\draw (140pt,20pt) node [right, blue] {$\varepsilon = 0.8$};
\draw (100pt,-0pt) node [thick, below] {$x_0$};
\end{axis}
\end{tikzpicture}
但无论我选择多少个样本点，绘图仍然不平滑。
我怎样才能获得流畅的情节？
编辑 文件列表为
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
inputenc.sty 2008/03/30 v1.1d Input encoding file
utf8.def 2008/04/05 v1.1m UTF-8 support for inputenc
t1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
ot1enc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
omsenc.dfu 2008/04/05 v1.1m UTF-8 support for inputenc
pgfplots.sty 2009/02/14 Version 1.2.2
tikz.sty 2010/10/13 v2.10 (rcs-revision 1.76)
pgf.sty 2008/01/15 v2.10 (rcs-revision 1.12)
pgfrcs.sty 2010/10/25 v2.10 (rcs-revision 1.24)
everyshi.sty 2001/05/15 v3.00 EveryShipout Package (MS)
pgfrcs.code.tex
pgfcore.sty 2010/04/11 v2.10 (rcs-revision 1.7)
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2009/08/28 v1.8 graphics configuration of TeX Live
pdftex.def 2010/03/12 v0.04p Graphics/color for pdfTeX
pgfsys.sty 2010/06/30 v2.10 (rcs-revision 1.37)
pgfsys.code.tex
pgfsyssoftpath.code.tex 2008/07/18 (rcs-revision 1.7)
pgfsysprotocol.code.tex 2006/10/16 (rcs-revision 1.4)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
pgfcore.code.tex
pgfcomp-version-0-65.sty 2007/07/03 v2.10 (rcs-revision 1.7)
pgfcomp-version-1-18.sty 2007/07/23 v2.10 (rcs-revision 1.1)
pgffor.sty 2010/03/23 v2.10 (rcs-revision 1.18)
pgfkeys.sty
pgfkeys.code.tex
pgffor.code.tex
tikz.code.tex
supp-pdf.mkii
deltaF.tex
integral.tex
exponential.tex
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