Wrong tilde inserted into LaTeX

[jaredlander]

Run running functions that need a formula, say

lm(sons ~ fathers, data=heights)

The tilde is made into a "high" tilde instead of a "middle" tilde such as generated by $\sim$.

For example

<<father-son-lm>>=
heightsLM <- lm(sheight ~ fheight, data=father.son)
heightsLM
@

results in the following LaTeX

\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
> heightsLM <- \hlfunctioncall{lm}(sheight ~ fheight, data = father.son)
> heightsLM
\end{alltt}
\begin{verbatim}

Call:
lm(formula = sheight ~ fheight, data = father.son)

Coefficients:
(Intercept)      fheight  
     33.887        0.514  
\end{verbatim}
\end{kframe}
\end{knitrout}

and that generates

This is entirely cosmetic, but actually makes a big typographical difference. Is it possible to swap ~ with $\sim$ in the code blocks?

[yihui]

This is where I absolutely hate LaTeX. It is ridiculously difficult to typeset certain characters such as the tilde and straight single quotes/backticks. You can learn endless hacks in posts like this http://tex.stackexchange.com/questions/312/correctly-typesetting-a-tilde but I do not want to spend time on this. If you have got an elegant solution, let me know. You can certainly modify the source hook to substitute ~ with other commands such as \url{~}. It is not worth the effort in my eyes.

[jaredlander]

For now I'll leave it to the editor. When I get time I'll play with the hook. Should be fairly simple along the lines of

str_replace_all(string=x, pattern="~", replacement="\\url{~}")

or

str_replace_all(string=x, pattern="~", replacement="\$sim\$")

[kendonB]

@jaredlander Did you solve this one?

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[yihui]

This is where I absolutely hate LaTeX.

Hey @yihui you were an idiot. Apparently you had no idea what you were talking about in 2013!

[jaredlander]

Yet still more knowledgeable than almost anyone else.

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