R: how do you embed plots into a tab in RMarkdown in a procedural fashion?

Question

I can embed plots using just RMarkdown\'s {.tabset}

#### Heading  {.tabset}
##### Subheading 1
```{r, echo=F}
df[[1]]    
```

Answer 1

Adding both plot.new(), dev.off() inside the for loop solves the problem of adding all the figures in the last tab. See the complete solution here.

Answer 2

I played around a little and found a solution. You have to use print within the asis code chunk...

```{r}
library(ggplot2)
gg0 <- list()
gg0[[1]] <- ggplot(mtcars, aes(mpg, hp)) + geom_point()
gg0[[2]] <- ggplot(mtcars, aes(mpg, disp)) + geom_point()
gg0[[3]] <- ggplot(mtcars, aes(mpg, drat)) + geom_point()

headings <- c('hp','disp','drat')
```

#### Heading  {.tabset}
```{r, results='asis', echo = FALSE}
for (i in 1:length(gg0)) {
  cat("##### ",headings[i],"\n")
  print(gg0[[i]])
  cat('\n\n')
}
```

As an explanation, the cat command together with results='asis' produces the markdown code for a lower level headline and prints the ggplot graph afterwards. Since we used `{.tabset} in the parent headline, it creates the plots in separate tabs.