Plot size and resolution with R markdown, knitr, pandoc, beamer

problem ：

Doesn't fit on the slide by default, doesn't even print by any other means. Not suitable for slides by default , Not even by any other means .

Here's the .Rmd: Edit: it seems you have to use plot() in every chunk. This is a .Rmd： edit ： It seems that you have to use... In every block plot（）.Second plot now prints. The second figure is now printed .

# Plot should show at high resolution```{r echo=FALSE, comment = ""}# load some datarequire(plyr)rbi <- ddply(baseball, .(year), summarise,    mean_rbi = mean(rbi, na.rm = TRUE))``````{r}# plotplot(mean_rbi ~ year, type = "l", data = rbi)```# Second attempt```{r, fig.width = 2, fig.height = 2}plot(mean_rbi ~ year, type = "l", data = rbi)```# Third attempt```{r, out.width = 2, out.height = 2}plot(mean_rbi ~ year, type = "l", data = rbi)```# Fourth attempt```{r, out.width = '200px', out.height = '200px'}plot(mean_rbi ~ year, type = "l", data = rbi)```# Fifth attempt```{r, out.width = '\\maxwidth'}plot(mean_rbi ~ year, type = "l", data = rbi)```

Save that as test.Rmd Then compile to tex using beamer: Save as test.Rmd And then use test.Rmd Compiled into tex：

knit("test.Rmd")system("pandoc -s -t beamer --slide-level 1 test.md -o test.tex")

Open test.tex in RStudio and click "Compile PDF". stay RStudio Open in test.tex , And then click “ compile PDF”.

I've read Yihui's documentation and hope I haven't missed something really obvious. I have read Yihui Of file , I hope I didn't miss anything very obvious .

Edit new code incorporating Yihui's suggestions. edit Include new codes suggested by Yihui .

```{r setup, include=FALSE}opts_chunk$set(dev = 'pdf')```# Plot should show at high resolution```{r echo=FALSE, comment = ""}# load some datarequire(plyr)rbi <- ddply(baseball, .(year), summarise,    mean_rbi = mean(rbi, na.rm = TRUE))``````{r}# plotplot(mean_rbi ~ year, type = "l", data = rbi)```# Second attempt```{r, fig.width = 4, fig.height = 4}plot(mean_rbi ~ year, type = "l", data = rbi)```

sessionInfo()

 R version 3.0.1 (16/05/2013)Platform: x86_64-pc-linux-gnu (64-bit)Local: [1] LC_CTYPE = en_US.UTF-8 LC_NUMERIC = C LC_TIME = C LC_COLLATE = C         [5] LC_MONETARY=C        LC_MESSAGES=C        LC_PAPER=C           LC_NAME=C            [9] LC_ADDRESS=C         LC_TELEPHONE=C       LC_MEASUREMENT=C     LC_IDENTIFICATION=C attached base packages:[1] stats     graphics  grDevices utils     datasets  methods   base     other attached packages:[1] plyr_1.8       markdown_0.6   knitr_1.2      rCharts_0.3.51 slidify_0.3.52loaded via a namespace (and not attached): [1] RJSONIO_1.0-3   codetools_0.2-8 digest_0.6.3    evaluate_0.4.3  formatR_0.8     [6] grid_3.0.1      lattice_0.20-15 stringr_0.6.2   tools_3.0.1     whisker_0.3-2  [11] yaml_2.1.7  

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Solution ：

Reference resources ： https://stackoom.com/en/question/1DNFK