r - Figures captions and labels in knitr

Question

I'm new to Knitr. I'm trying to make a report using r chunks, and I can't figure out how to use captions and labels to reference the figure later on. Here's an example of what I would like to do:

---
title: "Plotting"

author: "xx"

date: '2015-08-10'

output: pdf_document
---
```{r figs, echo=FALSE, fig.width=7,fig.height=6,fig.cap="plotting example"}

    par(mfrow=c(2,2))
    plot(1:10, col=2)
    plot(density(runif(100, 0.0, 1.0)))
    plot(runif(100, 0.0, 1.0),type="l")
```

in Figure 
ef{fig:figs} we see examples of plotting in R.

I would like to have a caption "Plotting example", and have a label, so I can use Figure ef{fig.label} in the text. I have tried fig.cap and fig.lp, none of them works. I would appreciate if if someone can help.

Answer 1

You can achieve this by including fig_caption: yes in the header:

---
title: "Plotting"
output:
  pdf_document:
    fig_caption: yes
---

```{r figs, echo=FALSE, fig.width=7,fig.height=6,fig.cap="\label{fig:figs}plotting example"}
par(mfrow=c(2,2))
plot(1:10, col=2)
plot(density(runif(100, 0.0, 1.0)))
plot(runif(100, 0.0, 1.0),type="l")
```

in Figure 
ef{fig:figs} we see examples of plotting in R.

Note that the figure caption label should be included in the caption with a double backslash, as shown above.