# a weird beamer feature…

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**A**s I was preparing my slides for my third year undergraduate stat course, I got a weird error that got a search on the Web to unravel:

! Extra }, or forgotten endgroup. endframe ->egroup begingroup def @currenvir {frame} l.23 end{frame} begin{slide} ?

which was related with a fragile environment

begin{frame}[fragile] frametitle{simulation in practice} begin{itemize} item For a given distribution $F$, call the corresponding pseudo-random generator in an arbitrary computer language begin{verbatim} > x=rnorm(10) > x [1] -0.021573 -1.134735 1.359812 -0.887579 [7] -0.749418 0.506298 0.835791 0.472144 end{verbatim} item use the sample as a statistician would begin{verbatim} > mean(x) [1] 0.004892123 > var(x) [1] 0.8034657 end{verbatim} to approximate quantities related with $F$ end{itemize} end{frame}begin{frame}

but not directly the verbatim part: the reason for the bug was that the end{frame} command did not have a line by itself! Which is one rare occurrence where the carriage return has an impact in LaTeX, as far as I know… (The same bug appears when there is an indentation at the beginning of the line. Weird!) [Another annoying feature is wordpress turning > into > in the sourcecode environment…]

Filed under: Books, Kids, Linux, R, Statistics, University life Tagged: Beamer, bootstrap, course, fragile environment, LaTeX, R, random number generation, rnorm(), slides, Statistics, Université Paris Dauphine, verbatim, end{frame}

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