0

I want to show three items to evaluate the features of each one and then select one of them, so I need to show all of them first and then I need that two of them disappear, or at list become transparent. How can I do that?

Edit: (by Sigur)

Those answers were really helpful, but I have 3 items with several subitems in 3 columns. The method number 2 works with the subitems, but when I try to use it with the items, the tex has errors (missing } or \endgroup).

This is the code:

\begin{frame}
    \frametitle{\LARGE{TITLE}}
%   \vspace{4pt}
    \begin{itemize}
    \leftmarginii=0.8\leftmargini\relax
        \begin{columns}[t]
            \column{0.3\textwidth}
            \item<1> Item1:
                \begin{itemize}
                    \justifying
                    \vspace{4pt}
                    \item<1> \footnotesize{Subitem1}
                    \item<1> \footnotesize{Subitem2}
                \end{itemize}
            \column{0.3\textwidth}
            \item<1-2> Item2:
                \begin{itemize}
                    \justifying
                    \vspace{4pt}
                    \item<1-2> \footnotesize{Subitem1}
                    \item<1-2> \footnotesize{Subitem2}
                \end{itemize}
            \column{0.3\textwidth}
            \item<1> Item3:
                \begin{itemize}
                    \justifying
                    \vspace{4pt}
                    \item<1> \footnotesize{Subitem1}
                    \item<1> \footnotesize{Subitem2}
                \end{itemize}
        \end{columns}   
    \end{itemize}
\end{frame}

The new code:

\begin{frame}
    \frametitle{\LARGE{Title}}
    Antena para recepción APT
    \noindent%
    \begin{minipage}[t]{.27\textwidth}
        \begin{itemize}
            %\leftmarginii=0.8\leftmargini\relax
            \item<1> Antena Yagi:
            \begin{itemize}
                %\justifying
                \vspace{4pt}
                \item<1>[\color{red}\ding{55}] \footnotesize{Requiere un sistema de seguimiento por ser directiva.}
                \item<1>[\color{verde}\ding{51}] \footnotesize{Ganancia alta ($>$10 dB). Incrementable si se añaden más elementos.}
                \item<1>[\color{red}{\ding{55}}] \footnotesize{Polarización lineal.}
                \item<1>[\color{red}{\ding{55}}] \footnotesize{Gran tamaño y carga al viento.}
            \end{itemize}
        \end{itemize}
    \end{minipage}      

    \begin{minipage}[t]{.29\textwidth}
        \begin{itemize}
            %\leftmarginii=0.8\leftmargini\relax
            \item<1-2> Antena QHA:
            \begin{itemize}
                %\justifying
                \vspace{4pt}
                \item<1-2>[\color{verde}\ding{51}] \footnotesize{No se necesita un sistema de seguimiento al ser poco directiva.} 
                \item<1-2>[\color{red}{\ding{55}}] \footnotesize{Ganancia baja ($<$5 dB).} 
                \item<1-2>[\color{verde}\ding{51}] \footnotesize{Polarización circular.}
                \item<1-2>[\color{verde}\ding{51}] \footnotesize{Anchura reducida.}
            \end{itemize}
        \end{itemize}
    \end{minipage}

    \begin{minipage}[t]{.29\textwidth}
        \begin{itemize}
            %\leftmarginii=0.8\leftmargini\relax
            \item<1> Antena DCA:
            \begin{itemize}
                %\justifying
                \vspace{4pt}
                \item<1>[\color{verde}\ding{51}] \footnotesize{No se necesita un sistema de seguimiento al ser poco directiva.}
                \item<1>[\color{red}{\ding{55}}] \footnotesize{Ganancia baja (Entre 4 y 6 dB).}  
                \end{itemize}   
        \end{itemize}
    \end{minipage}
\end{frame}
  • Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – cfr Jul 6 '14 at 15:01
9

Just specify the slides on which you want things to appear.

Method 1: Relative Overlay Specifications

\documentclass{beamer}
\begin{document}
  \begin{frame}
    \begin{itemize}
        \item<+> First
        \item<.-+>Second
        \item<+(-2)>Third
    \end{itemize}
  \end{frame}
\end{document}

+ increments the overlay count which beamer uses to track things. . specifies the current slide. n-m specifies a range i.e. slides n to m inclusive. n and m can be numbers (absolute specifications e.g. slide 1 or slide 3) or variations on the +, . etc. (relative specifications e.g. this slide . or the next slide +). +(n) tells beamer to increment the count and add n. n may be negative or positive.

So the above increments the count, putting the first item on slide 1 (as opposed to 0 which would not be shown); shows the second item from the current slide which is now 1 to the next slide 2; and finally shows the third item on slide 1 (because the + increments the number to 3 but the (-2) decreases it by 2 and 3-2=1).

Method 2: Absolute Overlay Specifications

For simple cases, it is often easier to just tell beamer which slides to use directly rather than worrying about relative specifications. For example, the following is equivalent to the above:

\documentclass{beamer}
\begin{document}
  \begin{frame}
    \begin{itemize}
        \item<1> First
        \item<1-2>Second
        \item<1>Third
    \end{itemize}
  \end{frame}
\end{document}

Invisibility

Transparency

If you would prefer to show the covered items as transparent simply add

\setbeamercovered{transparent}

to your preamble. For example:

\documentclass{beamer}
\setbeamercovered{transparent}
\begin{document}
  \begin{frame}
    \begin{itemize}
        \item<1> First
        \item<1-2>Second
        \item<1>Third
    \end{itemize}
  \end{frame}
\end{document}

With transparency

| improve this answer | |
1

A simple possible solution. You can improve it, ifyou wish.

\documentclass{beamer}

\begin{document}
\begin{frame}

\begin{itemize}
\item<1> Only at 1st slide
\item<1> Also only at 1st slide
\item<1-2> At 1st and 2nd slide
\end{itemize}

\end{frame}
\end{document}

enter image description here

Edit:

\begin{frame}
\noindent%
\begin{minipage}[t]{.3\linewidth}
\begin{itemize}
%                    \justifying
                    \vspace{4pt}
                    \item<1> \footnotesize{Subitem1}
                    \item<1> \footnotesize{Subitem2}
                \end{itemize}
\end{minipage}
\begin{minipage}[t]{.3\linewidth}
\begin{itemize}
%                    \justifying
                    \vspace{4pt}
                    \item<1-2> \footnotesize{Subitem1}
                    \item<1-2> \footnotesize{Subitem2}
                \end{itemize}
\end{minipage}
\begin{minipage}[t]{.3\linewidth}
\begin{itemize}
%                    \justifying
                    \vspace{4pt}
                    \item<1> \footnotesize{Subitem1}
                    \item<1> \footnotesize{Subitem2}
                \end{itemize}
\end{minipage}
\end{frame}
| improve this answer | |

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