R inline markdown

Question

I’m using R Markdown in RStudio to create a report that mixes Markdown and R output. I know how to use inline R expressions in the Markdown, but I’m wondering how to do the converse, i.e., use Markdown within the R code. I want to loop through a series of calculations and get Markdown headings for each one. I want headings for formatting purposes (e.g., bold titles etc) and also to be able to specify (sub)sections in the resulting PDF (which is a nice feature of the way RMarkdown handles # and ## etc).

I know I can do the following:

---
title: "test"
output: pdf_document
---

#Section 1

```{r, echo=FALSE}
print(1+1)
```

#Section 2

```{r, echo=FALSE}
print(2+2)
```

#Section 3

```{r, echo=FALSE}
print(3+3)
```

Which gives something looking (roughly) like this:

Section 1

## [1] 2

Section 2

## [1] 4

Section 3

## [1] 6

Is it possible to achieve the same output using something along the lines of this:

---
title: "test2"
output: pdf_document
---

```{r, echo=FALSE}
for (i in 1:3)
{
  print(paste("#Section",i))
  print(i+i)
}
```

Answer 1

As @scoa pointed out, you have to set the chunk option results='asis'. You should also place two \n both before and after your header.

---
title: "test"
output: pdf_document
---

```{r, echo=FALSE, results='asis'}
for (i in 1:3) {
  cat(paste0("\n\n# Section", i, "\n\n"))
  print(i+i)
  cat("\n\n\\newpage")
}
```