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85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
---
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title: "Hiding Answers in Lecture Slides using Latex Beamer"
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date: 2023-10-09T11:40:36-04:00
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draft: false
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tags: ["LaTex"]
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math: false
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medium_enabled: false
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---
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Asking questions is a great way to try to solicitate engagement from students. However, it can feel at odds with trying to provide a fully comprehensive slide deck at times. Similar to having notes [hidden for yourself](/blog/notes-beamer-latex/), we should also have a way to hide answers for the students of the present but not the students of the future.
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LaTex beamer has the `\invisible` command which holds the space for the text but doesn't display it. We can create a new command with an if statement stating whether or not we want to use `\invisible`.
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For this, I called the variable `showanswer`, but you can call it whatever you like. Put the following code in the preamble of your beamer document.
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```latex
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\newif\ifshowanswer
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%\showanswertrue % Uncomment when you want to show the answer
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\newcommand{\HideAns}[1]{\unless\ifshowanswer \invisible{#1} \else #1 \fi}
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```
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To write `if not` in LaTex, we need to use `\unless\if`.
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Now let's see this in action. Here is a slide I gave in a recent lecture about Unification:
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```latex
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\begin{frame}{Examples}
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\begin{enumerate}
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\item $f(x, y) \eq f(g(x), b)$
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\begin{itemize}
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\item Answer: \HideAns{None - Occurs Check}
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\end{itemize}
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\item $f(x, a) \eq f(a, b)$
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\begin{itemize}
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\item Answer: \HideAns{None - Function Clash}
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\end{itemize}
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\item $g(x) \eq g(y)$
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\begin{itemize}
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\item Answer: \HideAns{$x \mapsto y$}
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\end{itemize}
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\end{enumerate}
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\end{frame}
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```
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The left shows the hidden version, and the right shows the version I can distribute afterwards.
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Minimal Working Example:
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```latex
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\documentclass{beamer}
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\usetheme{Copenhagen}
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\usepackage[utf8]{inputenc}
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\newcommand{\eq}{\stackrel{?}{=}}
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\newif\ifshowanswer
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% \showanswertrue % Uncomment when you want to show the answer
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\newcommand{\HideAns}[1]{\unless\ifshowanswer \invisible{#1} \else #1 \fi}
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\begin{document}
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\begin{frame}{Examples}
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\begin{enumerate}
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\item $f(x, y) \eq f(g(x), b)$
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\begin{itemize}
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\item Answer: \HideAns{None - Occurs Check}
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\end{itemize}
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\item $f(x, a) \eq f(a, b)$
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\begin{itemize}
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\item Answer: \HideAns{None - Function Clash}
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\end{itemize}
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\item $g(x) \eq g(y)$
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\begin{itemize}
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\item Answer: \HideAns{$x \mapsto y$}
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\end{itemize}
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\end{enumerate}
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\end{frame}
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\end{document}
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```
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