How to pass a variable from Rmd file to a latex file

Question

I have two file 1. index.rmd file and the other is 2.Preamble.tex file I want to delclare a variable in index.rmd i.e. a <- 'Start and end with single quote' I want to pass the above variable in preamble.tex usepackage{fancyhdr} newcommandCenterHeader{>>>>**a(variable)**<<<<<} It can be an rmd file or a r file how do I achieve this

Yihui Xie · Answer

First, create preamble.Rnw:
usepackage{fancyhdr}
newcommandCenterHeader{Sexpr{a}}

Then in index.Rmd, compile preamble.Rnw after you have created a:
```{r}
a <- 'Start and end with single quote'
```

```{r, include=FALSE}
xfun::Rscript_call(function() {
  knitr::knit('preamble.Rnw', envir = list(a = a)
})
```

This will generate preamble.tex.

How to pass a variable from Rmd file to a latex file

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