[Tex/LaTex] Error: Missing \endcsname inserted. \tex_let:D \begin{}

templates

I'm using texmaker 4.5. I'm trying to compile the following text on Windows 10:

\documentclass[english]{MastersDoctoralThesis} 
\begin{document}
\frontmatter 
\begin{titlepage}

    The Title.

\end{titlepage}
\begin{declaration}

    The Declaration.

\end{declaration}
\end{document}

But when I compile it, the following error appears:

''! Missing \endcsname inserted.
<to be read again>
\tex_let:D
\begin{document}''

How can I solve it?

The template can be found at: http://www.latextemplates.com/template/masters-doctoral-thesis

Best Answer

Update: 2017/03/09 With the new update of xparse and expl3 packages from 2017/03/07 it is possible to use commands defined with \DeclareDocumentCommand in \csname ...\endcsname constructs ago, which is the case in the background code of `\pagestyle, for example.

The \blank@p@gestyle macro is defined in MDT with \DeclareDocumentCommand which isn't expandable, but \pagestyle needs an expandable name, so this fails.

With this bypassing code

\makeatletter
\AtBeginDocument{
  \renewcommand{\blank@p@gestyle}{empty}
}
\makeatother

the macro is exandable again.

A future release of xparse will remove the necessity of this bypass.

This tiny document shows the same error (and is the short version of what happens)

\documentclass{article}

\usepackage{xparse}

\DeclareDocumentCommand{\foo}{}{empty}

\begin{document}
\pagestyle{\foo}

\end{document}

Option 1: Using `knit_child()` with inline R code

Say your setup is like the following. In the same directory, you have:

`graph.R`

## ---- graph
library(ggplot2)
CarPlot <- ggplot() +
    stat_summary(data= mtcars,
                 aes(x = factor(gear),
                     y = mpg
                 ),
                 fun.y = "mean",
                 geom = "bar"
                 )
CarPlot

`chapter1.Rnw`

Hey, look, a graph (Figure~\ref{fig:graph})!

<<graph, echo=FALSE, message=FALSE, fig.lp='fig:', out.width='.5\\linewidth', fig.align='center', fig.cap="A graph", fig.pos='h!'>>=
@

`main.Rnw`

\documentclass{article}

\begin{document}

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

\Sexpr{knit_child('chapter1.Rnw')}

\end{document}

Then, you can knit the main.Rnw file and compile the resulting .tex file with either pdflatex or xelatex.

The output is:

enter image description here

Note that you can also read the external .R file from the child .Rnw file.

So, the following would have worked just as well.

`chapter1-mod.Rnw`

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

Hey, look, a graph (Figure~\ref{fig:graph})!

<<graph, echo=FALSE, message=FALSE, fig.lp='fig:', out.width='.5\\linewidth', fig.align='center', fig.cap="A graph", fig.pos='h!'>>=
@

`main-mod.Rnw`

\documentclass{article}

\begin{document}

\Sexpr{knit_child('chapter1-mod.Rnw')}

\end{document}

Option 2: Using chunk option `child`

Assuming you have graph.R and chapter1.Rnw from above in the same directory, then your main.Rnw should be:

\documentclass{article}

\begin{document}

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

<<child-demo, child='chapter1.Rnw'>>=
@

\end{document}

Note that you can also read the external .R file from within the child document in this case, too.

So, assuming you had graph.R and chapter1-mod.Rnw from above in the same directory, then your main-mod.Rnw file should be:

\documentclass{article}

\begin{document}

<<child-demo, child='chapter1-mod.Rnw'>>=
@

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] greek in latex-template thesis

[Tex/LaTex] Building TeX file from knitr Rnw as child of larger parent TeX file to use R objects and output

Option 1: Using knit_child() with inline R code

graph.R

chapter1.Rnw

main.Rnw

chapter1-mod.Rnw

main-mod.Rnw

Option 2: Using chunk option child

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