Flavio Barros - 11 months ago 91

LaTeX Question

When I'm using the package exams to generate questions, I can do it perfectly in english even with special characters. For example, a Rnw question that I can compile with exams package:

`<<echo=FALSE, results=hide>>=`

## DATA GENERATION

P <- round(runif(n = 1, min = 1000, max = 2000), digits = 2)

S <- round(runif(n = 1, min = P + 500, max = 3000), digits = 2)

## QUESTION/ANSWER GENERATION

i <- round((S - P)/P, digits = 2)*100

@

\begin{question}

Qual \'e a taxa de juros simples obtida por uma aplica\c{c}\~ao de \textdollar $\Sexpr{P}$ que, ap\'os um ano, produz um montante de \textdollar$\Sexpr{S}$?

\end{question}

\begin{solution}

Os juros s\~ao calculados por:

\begin{equation}

S = P(1+i \times n) \Rightarrow S = P + Pin \Rightarrow

\end{equation}

\begin{equation}

Pin = S - P \Rightarrow

i = \frac{S-P}{Pn} \Rightarrow i = \frac{S-P}{P}

\end{equation}

O valor absotulo dos juros \'e $\Sexpr{i}$\%.

\end{solution}

%% META-INFORMATION

%% \extype{num}

%% \exsolution{\Sexpr{fmt(abs(tstat), 3)}}

%% \exname{t statistic}

%% \extol{0.01}

For example, when I need ç I just use \c{c} and so on. BUT, I have been trying to use Rmarkdown instead of Rnw files. And the same example in Rmd:

`---`

output: pdf_document

---

```{r data generation, echo = FALSE, results = "hide"}

P <- round(runif(n = 1, min = 1000, max = 2000), digits = 2)

S <- round(runif(n = 1, min = P + 500, max = 3000), digits = 2)

i <- round((S - P)/P, digits = 2)*100

```

Question

========

Qual é a taxa de juros simples obtida por uma aplicação de $`r P`

Solution

========

Os juros são calculados por:

\begin{equation}

S = P(1+i \times n) \Rightarrow S = P + Pin \Rightarrow

\end{equation}

\begin{equation}

Pin = S - P \Rightarrow

i = \frac{S-P}{Pn} \Rightarrow i = \frac{S-P}{P}

\end{equation}

O valor absotulo dos juros é `r i`%.

Meta-information

================

extype: num

exsolution: `r round(i, digits = 3)`

exname: Euclidean distance

extol: 0.01

I can compile with RStudio showing the accents correctly:

but when I try:

`exams2pdf('file.Rmd', encoding = 'utf8')`

it doen't work.

Could someone help me with this issue?

Answer Source

I tried different approaches with the arguments `header`

and `inputs`

of `exams2pdf()`

but none of those gave me the correct output. Also adding LaTeX commands via the YAML header (`header-includes`

) does not work. So I did it the "hard way":

Go to your R library and find the location where the package *exams* is saved. Inside navigate to the tex folder. There you will find the different templates used by *exams*. Create a copy of the default template *plain.tex* and call this duplicate *plain_pt.tex*. Inside that file you add

```
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[portuguese]{babel}
```

to the preamble. Save the file.

(*The full path on my OSX machine:* `/Library/Frameworks/R.framework/Versions/3.3/Resources/library/exams/tex`

)

Now, when calling `exams2pdf`

you can choose your new template with `template = plain_pt`

.

This should also work for other languages by adding the appropriate LaTeX commands.