Creating a custom LaTeX exam+solution document

latex-options.Rnw

---
---
title: "`r sprintf('Exam Questions%s', ifelse(params$solutions, ' and Solutions', ''))`"
author: ""
date: ""
output: pdf_document
params: 
  solutions: TRUE
---

```{r echo=FALSE, results='asis'}
cat(sprintf("Value of 'solutions' parameter: %s\n", as.character(params$solutions)))
```

```{r echo=FALSE, results='asis'}
cat('This is a question with LaTeX: Compute the integral $\\int \\frac{1}{x} dx$.')
```

```{r echo=FALSE, results='asis'}
if(params$solutions) {
  cat('This is a solution with LaTeX: $\\int \\frac{1}{x} dx = \\log(x) + C$.')
}
```