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Beamer 中的叠加问题

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Beamer 中的叠加问题

我正在尝试让以下几个项目出现在一个框架中，但每次只显示一张幻灯片，每张幻灯片后都会消失。这是代码，但它是错误的，我不知道在哪里。

\begin{frame}[t]
\frametitle{Slope of a Tangent Line}

% The following two lines I want to appear on one slide:
\only<1>Consider the function $f(x)$ and the tangent line at the point $(a,f(a))$: \bigskip
\begin{center}\includegraphics[width=3.5in]{fig1}\end{center} \pause

%The following two lines I want to appear on another
\only<2>To find the slope of the tangent to $f(x)$ at this point, we begin by looking at the secant line through the point $(a,f(a))$ and some other point $(x,f(x))$. The graph would be: 
\begin{center}\includegraphics[width=3.5in]{fig2}\end{center} \pause

\end{frame}

添加括号后，我仍然得到以下信息： 这是第一张幻灯片

这是第二次。

问题是图像根本没有改变，现在底部有文字。

这是最新的代码：

  \begin{frame}[t]
   \frametitle{Slope of a Tangent Line}


    \only<1->{Consider the function $f(x)$ and the tangent line at the point $(a,f(a))$: \bigskip 
   \begin{center}\includegraphics[width=3.5in]{fig1}\end{center} }

   \only<2>{To find the slope of the tangent to $f(x)$ at this point, we begin by looking at the secant line through the point $(a,f(a))$ and some other point $(x,f(x))$. The graph would be:  
  \begin{center}\includegraphics[width=3.5in]{fig2}\end{center}}

  \only<3>{The point $(x,f(x))$ that we chose was arbitrary. We could have chosen any point that we wanted, so now let's choose a point that is closer to $(a,f(a))$ and look at the secant through those two points.
 \begin{center}\includegraphics[width=3.5in]{fig3}\end{center}}

 \only<4>{Again, let's move the point $(x,f(x))$ even closer to $(a,f(a))$ and see what the secant looks like. \bigskip
\begin{center}\includegraphics[width=3.5in]{fig4}\end{center}}

\only<5>{Notice that each time we move the second point $(x,f(x))$ closer to $(a,f(a))$, the secant through those two points moves closer to the tangent.
\begin{center}\includegraphics[width=3.5in]{fig5}\end{center}}

\only<6>{Notice that each time we move the second point $(x,f(x))$ closer to $(a,f(a))$, the secant through those two points moves closer to the tangent.
\begin{center}\includegraphics[width=3.5in]{fig6}\end{center}}

\end{frame}

答案1

您只是缺少一些括号。\only<slides>{Text}需要这些括号才能获取所有内容。在任何其他情况下，它只会使用下一个标记（对于第一个示例“C”）并仅在幻灯片 1 上显示该标记。

此外，您还应该删除您的\pause宏，因为宏之后它们就毫无用处了\only。

更新：\only为了您的目的（尤其是在更新的代码中），只需为(in )添加幻灯片编号即可<>。请勿使用连字符。

仅在投影机中

\documentclass[demo]{beamer}

\begin{document}
\begin{frame}[t]
\frametitle{Slope of a Tangent Line}

% The following two lines I want to appear on one slide:
\only<1>{Consider the function $f(x)$ and the tangent line at the point $(a,f(a))$: \bigskip
\begin{center}\includegraphics[width=3.5in]{fig1}\end{center}}
%The following two lines I want to appear on another
\only<2>{To find the slope of the tangent to $f(x)$ at this point, we begin by looking at the secant line through the point $(a,f(a))$ and some other point $(x,f(x))$. The graph would be: 
\begin{center}\includegraphics[width=3.5in]{fig2}\end{center}}
\end{frame}
\end{document}

答案2

包含缺失括号并删除不必要的\pauses 的代码示例：

\documentclass{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\begin{document}
\begin{frame}[t]
\frametitle{Slope of a Tangent Line}

% The following two lines I want to appear on one slide:
\only<1>{Consider the function $f(x)$ and the tangent line at the point $(a,f(a))$: \bigskip
    \begin{center}\includegraphics[height=1.5in]{fig1}\end{center}}

%The following two lines I want to appear on another
\only<2>{To find the slope of the tangent to $f(x)$ at this point, we begin by looking at the secant line through the point $(a,f(a))$ and some other point $(x,f(x))$. The graph would be: 
    \begin{center}\includegraphics[height=1.5in]{fig2}\end{center}}

\end{frame}
\end{document}

编辑：慢了 5 秒

EDIT2：对于您最新的代码，您应该-从第一个中删除\only<1->：

\begin{frame}[t]
\frametitle{Slope of a Tangent Line}


\only<1>{Consider the function $f(x)$ and the tangent line at the point $(a,f(a))$: \bigskip %here I removed the '-' from \only<1->
\begin{center}\includegraphics[width=3.5in]{fig1}\end{center} }

\only<2>{To find the slope of the tangent to $f(x)$ at this point, we begin by looking at the secant line through the point $(a,f(a))$ and some other point $(x,f(x))$. The graph would be:  
\begin{center}\includegraphics[width=3.5in]{fig2}\end{center}}

\only<3>{The point $(x,f(x))$ that we chose was arbitrary. We could have chosen any point that we wanted, so now let's choose a point that is closer to $(a,f(a))$ and look at the secant through those two points.
\begin{center}\includegraphics[width=3.5in]{fig3}\end{center}}

\only<4>{Again, let's move the point $(x,f(x))$ even closer to $(a,f(a))$ and see what the secant looks like. \bigskip
\begin{center}\includegraphics[width=3.5in]{fig4}\end{center}}

\only<5>{Notice that each time we move the second point $(x,f(x))$ closer to $(a,f(a))$, the secant through those two points moves closer to the tangent.
\begin{center}\includegraphics[width=3.5in]{fig5}\end{center}}

\only<6>{Notice that each time we move the second point $(x,f(x))$ closer to $(a,f(a))$, the secant through those two points moves closer to the tangent.
\begin{center}\includegraphics[width=3.5in]{fig6}\end{center}}

\end{frame}

顺便说一句：如果您的一个帧不包含任何持久信息，您可能需要考虑添加更多帧。

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