dynamic tabsets with multiple plots r markdown - r

Question

I managed to create a html document that creates dynamic tabsets based on a list of items. Adding one plot works fine on one tabset. How can I add now multiple plots on one tabset?
Hereby the code I started from but it only shows 1 plot per tabset when you knit the document to html output. obviously there is still something missing.
---
title: "R Notebook"
output:
html_document:
df_print: paged
editor_options:
chunk_output_type: inline
---
### header 1
```{r}
library(ggplot2)
df <- mtcars
pl_list <- list()
pl1 <- qplot(cyl, disp, data = df[1:12,])
pl2 <- qplot(mpg, cyl, data = df[13:20,])
pl3 <- qplot(mpg, cyl, data = df[21:30,])
pl4 <- qplot(mpg, cyl, data = df[1:12,])
pl_list[[1]] <- list(pl1, pl3, "one")
pl_list[[2]] <- list(pl2, pl4, "two")
```
### header {.tabset}
```{r, results = 'asis', echo = FALSE}
for (i in seq_along(pl_list)){
tmp <- pl_list[[i]]
cat("####", tmp[[3]], " \n")
print(tmp[1])
cat(" \n\n")
}
```

Answer 1

There are a couple of improvements you can do.
Create cat header function with arguments for text and level.
With it you don't need to call cat multiple times and it creates wanted number of # automatically.
catHeader <- function(text = "", level = 3) {
cat(paste0("\n\n",
paste(rep("#", level), collapse = ""),
" ", text, "\n"))
}
print plots using lapply.
Full code looks like this:
---
title: "R Notebook"
output:
html_document:
df_print: paged
editor_options:
chunk_output_type: inline
---
```{r, functions}
catHeader <- function(text = "", level = 3) {
cat(paste0("\n\n",
paste(rep("#", level), collapse = ""),
" ", text, "\n"))
}
```
### header 1
```{r}
library(ggplot2)
df <- mtcars
pl_list <- list()
pl1 <- qplot(cyl, disp, data = df[1:12,])
pl2 <- qplot(mpg, cyl, data = df[13:20,])
pl3 <- qplot(mpg, cyl, data = df[21:30,])
pl4 <- qplot(mpg, cyl, data = df[1:12,])
pl_list[[1]] <- list(pl1, pl3, "one")
pl_list[[2]] <- list(pl2, pl4, "two")
```
## header {.tabset}
```{r, results = "asis", echo = FALSE}
for(i in seq_along(pl_list)){
tmp <- pl_list[[i]]
# As you want to use tabset level here has to be lower than
# parent level (ie, parent is 2, so here you have to use 3)
catHeader(tmp[[3]], 3)
lapply(tmp[1:2], print)
}
```