topnush
Consider the following MWE:


\documentclass{beamer}

\usepackage{accents}

\usepackage{tikz}

\begin{document}

\begin{frame}[fragile]{}

\begin{itemize}[<+(1)->]
\item one
\item two
\item three
\end{itemize}
\pause
\uncover<4->{
First line:

$\foreach \x [count=\y] in {1,2,3,4,5,6,7,8,9}{ \alt<\y>{\underaccent{\bar}{\x}}{\x} }$

\vskip 0.5cm

\hspace*{1cm}
\uncover<1-9>
{
$S$ = \foreach [count=\y] \x in {{\{1\}},{\{1,2\}},{\{1,2,3\}},{\{1,4,3\}},{\{5,4,3\}},{\{5,6,3\}},{\{5,6,3\}},{\{5,6,3\}},{\{5,6,9\}}}{\only<\y>{\x}}\\
\hspace*{1.25cm}$\frac{s}{t}$ = \foreach [count=\y] \x in  {1,1,1,0.75,0.6,0.5,0.429,0.375,0.333}{\only<\y>{\x}}
}
}

\end{frame}
\end{document}


When it gets to First line I would like the counter to be back at 1 so that it underlines from the 1..9 instead of 5..9. Similarly for the two lines below they should be going from index 1, not 5. Is there any way to do that?
user 3.14159
You can use the counter beamerpauses (I think).

\documentclass{beamer}
\usepackage{accents}
\usepackage{pgffor}

\begin{document}

\begin{frame}[fragile]{}

\begin{itemize}[<+(1)->]
\item one
\item two
\item three
\end{itemize}
\pause
First line:

$\edef\myoffset{\number\value{beamerpauses}} \foreach \x [count=\y from \myoffset] in {1,2,3,4,5,6,7,8,9}{ \alt<\y>{\underaccent{\bar}{\x}}{\x} }$

\vskip 0.5cm

\hspace*{1cm}\edef\myoffsetB{\number\value{beamerpauses}}
\begin{aligned} S &= \foreach [count=\y from \myoffsetB] \x in {{\{1\}},{\{1,2\}},{\{1,2,3\}},{\{1,4,3\}},{\{5,4,3\}},{\{5,6,3\}},{\{5,6,3\}},{\{5,6,3\}},{\{5,6,9\}}}{% \only<\y>{\x}}\\ \frac{s}{t} &= \foreach [count=\y from \myoffsetB] \x in {1,1,1,0.75,0.6,0.5,0.429,0.375,0.333}{\only<\y>{\x}} \end{aligned}
\end{frame}
\end{document}

![ani.gif](/image?hash=7167b1d7f6f109b48cc77accd06c19415fb92cab011a0404bf047cf4262eecb5)

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