之前我在 \documentclass{article} 中运行了关于图表的程序代码，成功了。但是，当我将其更改为 \documentclass{beamer} 并在文本中添加 \begin{frame} ...content... \end{frame} 时，问题就来了。有谁知道如何解决这个问题。这是我的图表代码：
\documentclass{beamer}
\usepackage[margin=0.5in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage{textcomp}
\usepackage{pgfplots}
\pgfplotsset{width=10cm,compat=1.9}
\begin{document}
\begin{frame}
\begin{tikzpicture}
\begin{axis}[
title={},
xlabel={Shape parameter},
ylabel={Confidence Interval for location parameter},
xmin=-3.5, xmax=1.5,
ymin=0, ymax=10.5,
xtick={-3,-2,-1,0,1},
ytick={4,6,8,10},
legend pos=north west,
ymajorgrids=true,
grid style=dashed,
]
\addplot [
color=red,
]
coordinates {(-3,9.079491)(-2.5,9.452603)(-2,9.777221)(-1.9,9.766175)
(-1.8,9.919383)(-1.7,9.968541)(-1.6,10.033590)(-1.5,10.091473)(-1.4,10.058541)
(-1.3,10.227247)(-1.2,10.16644)(-1.1,10.229299)(-1.0,10.192760)(-0.9,10.192760)
(-0.8,10.241929)(-0.7,10.216065)(-0.6,10.227887)(-0.5,10.186640)(-0.4,10.169810)
(-0.3,10.258170)(-0.2,10.250998)(-0.1,10.19826)(0.2,10.209682)(0.4,10.193243)
(0.6,10.205120)(0.8,10.184040)(1.0,10.247810)};
\addplot[
color=blue,
]
coordinates{(-3,2.859848)(-2.5,6.456956)(-2.0,7.751660)(-1.9,8.111291)
(-1.8,8.394369)(-1.7,8.534462)(-1.6,8.775830)(-1.5,9.011516)(-1.4,9.098876)
(-1.3,9.286731)
(-1.2,9.257532)(-1.1,9.407769)(-1.0,9.688250)(-0.9,9.735059)(-0.8,9.814046)
(-0.7,9.780176)(-0.6,9.814046)(-0.5,9.800660)(-0.4,9.768130)(-0.3,9.818090)
(-0.2,9.831134)(-0.1,9.772771) (0.2,9.772683)(0.4,9.795465)(0.6,9.745820)
(0.8,9.830740)(1.0,9.819173)};
\end{axis}
\end{tikzpicture}
\end{frame}