knitr - Generate Dynamic R Markdown Blocks

Question

In my dataset, I have 60 groups that I want to analyze in put into an HTML report using R Markdown. Because I want to apply the same analysis to each group, I am hoping that there is a way I can dynamically generate the code blocks/analysis.

Simply, I want to avoid replicating the block 60 times.

I came across this this question which uses children in knitr. I have attempted to replicate this with the iris dataset. In my example below, all I wanted to do was generate three H4 titles, one for each species.

It's worth noting that I am not married to this approach, it just appears to be related to what I am looking to do.

Here are the files I used:

parent.RMD file. This would be my "master" report.

Automate Chunks of Analysis in R Markdown 
========================================================


```{r setup, echo=FALSE}
library(knitr)
```


```{r run-numeric-md, include=FALSE}
out = NULL
for (i in as.character(unique(iris$Species))) {
  out = c(out, knit_child('child.Rmd'))
}

```

And here is child.Rmd.

#### Species = `r [i]`

Answer 1

Try knit_expand():

Automate Chunks of Analysis in R Markdown 
========================================================

```{r setup, echo=FALSE}
library(knitr)
```

```{r run-numeric-md, include=FALSE}
out = NULL
for (i in as.character(unique(iris$Species))) {
  out = c(out, knit_expand(text='#### Species = {{i}}'))
}
```

`r paste(knit(text = out), collapse = '
')`

You can also create a template file like 'child.rmd' and put this in your for loop so you don't have to put a complicated analysis in quotes:

out = c(out, knit_expand('template.rmd'))

Then have your 'template.rmd' be:

#### Species = {{i}}