appendix currently giving me a blank page with just title - R Markdown

Question

I am trying to put a table in the first page of the appendix in R Markdown as per:

\newpage
# References {-}

<div id="refs"></div>

\newpage
# Appendix {-}

\setcounter{table}{0}
\renewcommand{\thetable}{A\arabic{table}}

```{r pre_table_appendix, message=FALSE, warning=FALSE, echo=FALSE, include=FALSE, fig.pos="H"}
tab <- matrix(c("text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4"), ncol=4, byrow=TRUE)
colnames(tab) <- c('Variable','Variable','Variable','Variable')
rownames(tab) <- NULL
tab <- as.table(tab)

table_appendix <- kbl(tab, longtable = T, booktabs = T, row.names = 0, caption = "Title.") %>%
kable_styling(latex_options = c("repeat_header"))

```

\begin{landscape}
```{r table_appendix_f, echo=FALSE}
table_appendix
```
\end{landscape}

However because my table_appendix is in landscape I end up with one blank page with just "Appendix" and then another page with the actual table. Anyone knows how to put the table together with Appendix?

Answer 1

If I have right understand you...

Adding to our header:

 - \usepackage{pdflscape}
 - \newcommand{\blandscape}{\begin{landscape}}
 - \newcommand{\elandscape}{\end{landscape}}

LaTeX-engine should be pdflatex.

Your code from the question:

\newpage
# References {-}

<div id="refs"></div>

\newpage
\blandscape
# Appendix {-}


\setcounter{table}{0}
\renewcommand{\thetable}{A\arabic{table}}

```{r pre_table_appendix, message=FALSE, warning=FALSE, echo=FALSE, include=FALSE, fig.pos="H"}
library(kableExtra)
tab <- matrix(c("text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4",
                "text1", "text2", "text3", "text4"), ncol=4, byrow=TRUE)
colnames(tab) <- c('Variable','Variable','Variable','Variable')
rownames(tab) <- NULL
tab <- as.table(tab)

table_appendix <- kbl(tab, longtable = T, booktabs = T, row.names = 0, caption = "Title.") %>%
kable_styling(latex_options = c("repeat_header"))

```


```{r table_appendix_f, echo=FALSE}
table_appendix
```
\elandscape
\newpage

ccontent 
content
content
content
content

P.S. About this problem with the page's number, you know, I think.

---

Without this problem:

add to your header: - \usepackage[paper=A4]{typearea}

\newpage
\KOMAoptions{paper=landscape,DIV=current}
\recalctypearea

# Appendix {-}

 *** your code***

```{r table_appendix_f, echo=FALSE}
table_appendix
```
     
\newpage
\KOMAoptions{paper=portrait,DIV=current}
\recalctypearea

ccontent 
content

And voila :)

!!! But remember, it has an influence to your margins. Check better before printing a document.