[Tex/LaTex] Undefined control sequence in R markdown

markdownr

I have got stuck on this code which I could not be
able to find that in my content anymore after checking for
more than two times.

Is there any packages I should have updated?
As I am using TexShop and Text Live Utility.
Thank you very much!
I need to compile it and submit the assignment on time. 🙁
Any help would be appreciated!!

    /Applications/RStudio.app/Contents/MacOS/pandoc/pandoc +RTS -K512m -RTS STAT_731_Exam_3_JenLi_Chen.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output STAT_731_Exam_3_JenLi_Chen.tex --template /Library/Frameworks/R.framework/Versions/3.5/Resources/library/rmarkdown/rmd/latex/default-1.17.0.2.tex --highlight-style tango --latex-engine pdflatex --variable graphics=yes --variable 'geometry:margin=1in' --variable 'compact-title:yes' 
! Undefined control sequence.
l.138 ...a)e^{-x/\theta},\) \(x\ge0,\) \(\theta\gt
                                                  0\)

Best Answer

Macros like \ge is defined by default to be equivalent to \geq or ≥. However, \gt is not. Assuming it should be equivalent to >, you can just add

---
# ...
header-includes:
  - \newcommand{\gt}{>}
  - \newcommand{\lt}{<}
# ...
---

nath defines them as well

\edef\lt{\mathchar\the\mathcode`<\relax}
\edef\gt{\mathchar\the\mathcode`>\relax}

so you can

---
# ...
header-includes:
  -\usepackage{nath}
# ...
---

as part of your YAML header.

Related Solutions

[Tex/LaTex] align, aligned and R Markdown

So, just to be clear (as it says this is unanswered), just write the align (without $$):

\begin{align}
a_1 &= \beta_0 \\
b_1 &= \beta_1 \\
c_1 &= \beta_2 \\
d_1 &= \beta_3
\end{align}

and not

$$
\begin{align}
a_1 &= \beta_0 \\
b_1 &= \beta_1 \\
c_1 &= \beta_2 \\
d_1 &= \beta_3
\end{align}
$$

[Tex/LaTex] Using biblatex with R Markdown

One rule of LaTeX is that it is a bad idea to load packages twice and that it is an error to load the same package twice with different options.

This is what happens here. You load biblatex manually in your preable.tex and then you say citation_package: biblatex in your .yml file, so the markdown conversion loads biblatex for you again. You get an error as soon as you load the package in preamble.tex with different options than the markdown preamble.

The solution is simple: Don't load biblatex in your preamble.tex. Let markdown handle that for you with citation_package: biblatex.

The way to pass options to biblatex when you use citation_package: biblatex is via your .yml file. https://github.com/jgm/pandoc-templates/blob/9134a5a5f73231ea323a9af4aa806c7945633a7d/default.latex#L313 suggests two things (I could not really find documentation about the second point)

You can use biblio-style: <style> in your .yml file to pass a style to biblatex, as you would do with style=<style> in the biblatex loading options in LaTeX.
You can use biblatexoptions: [<option_1>=<val_1>,...,<option_n>=<val_n>] to pass arbitrary options to biblatex.

This is done for example in https://stackoverflow.com/q/44633939, https://stackoverflow.com/q/45028623, https://rdrr.io/rforge/Pmisc/man/markdownHeader.html

So you could have _output.yml

bookdown::pdf_document2:
  latex_engine: lualatex
  includes: 
    in_header: preamble.tex
  keep_tex: yes
  citation_package: biblatex
  biblio-style: alphabetic
  biblatexoptions: [backend=biber, maxbibnames=999]

and would not load biblatex in preamble.tex, so that it only loads other things, for example

\usepackage{csquotes}

Best Answer

Related Solutions

[Tex/LaTex] align, aligned and R Markdown

[Tex/LaTex] Using biblatex with R Markdown

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