Setting fig.align in R chunks makes plot disappear in Beamer

[xiaoweiz]

If the option fig.align is set to anything other than default, the figure won't show up in the generated beamer slides.

Minimal example:

---
title: "Untitled"
author: "X"
date: "30 June, 2014"
output: beamer_presentation

---
## Slide with Plot
```{r, echo=FALSE, fig.align='center'}
plot(cars)```

[jjallaire]

Note that this is documented behavior of knitr (fig.align results in HTML being emitted). See: #86. It sounds like @yihui is planning on enhancing knitr to respect fig.align by outputting plots with raw_tex.

[yihui]

Yes I am. For the record, you may keep an eye on yihui/knitr#626. I hope to get it done in knitr 1.7. Before that happens, the easiest solution for you is to turn on figure captions, e.g.

---
title: "Untitled"
author: "X"
date: "30 June, 2014"
output:
  beamer_presentation:
    fig_caption: yes
---

## Slide with Plot

```{r, echo=FALSE, fig.width=4, fig.cap='Hello world!'}
plot(cars)
```

Then figures are centered by default since they are put in the figure environment in LaTeX.

[yihui]

FYI: This has been fixed in the development version of knitr, which I plan to release to CRAN in the next few days.

[johnsonzhj]

fig.align='center' seem still not work in the current version of knitr for pdf_document output.

[yihui]

@johnsonzhj You may also need the development version of rmarkdown here.

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