Plot size and resolution with R markdown knitr pandoc beamer

Question

Doesn t fit on the slide by default  doesn t even print by any other means   Here s the  Rmd  Edit  it seems you have to use plot   in every chunk   Second plot now prints     Plot should show at high resolution      r echo FALSE  comment         load some data require plyr  rbi  lt - ddply baseball    year   summarise      mean rbi   mean rbi  na rm   TRUE            r    plot plot 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   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    I ve read Yihui s documentation and hope I haven t missed something really obvious   Edit new code incorporating Yihui s suggestions       r setup  include FALSE  opts chunk set dev    pdf          Plot should show at high resolution      r echo FALSE  comment         load some data require plyr  rbi  lt - ddply baseball    year   summarise      mean rbi   mean rbi  na rm   TRUE            r    plot plot 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 52  loaded 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

User · Accepted Answer

I think that is a frequently asked question about the behavior of figures in beamer slides produced from Pandoc and markdown. The real problem is, R Markdown produces PNG images by default (from knitr), and it is hard to get the size of PNG images correct in LaTeX by default (I do not know why). It is fairly easy, however, to get the size of PDF images correct. One solution is to reset the default graphical device to PDF in your first chunk:

```{r setup, include=FALSE}
knitr::opts_chunk$set(dev = 'pdf')
```

Then all the images will be written as PDF files, and LaTeX will be happy.

Your second problem is you are mixing up the HTML units with LaTeX units in out.width / out.height. LaTeX and HTML are very different technologies. You should not expect \maxwidth to work in HTML, or 200px in LaTeX. Especially when you want to convert Markdown to LaTeX, you'd better not set out.width / out.height (use fig.width / fig.height and let LaTeX use the original size).

User · Answer

Figure sizes are specified in inches and can be included as a global option of the document output format  For example   --- title   My Document  output    html document      fig width  6     fig height  4 ---   And the plot s size in the graphic device can be increased at the chunk level       r  fig width 14  fig height 12            Expand the plot width to 14 inches  ggplot aes x mycolumn1  y mycolumn2          specify the x and y aesthetic geom line size 2                             makes the line thicker theme grey base size   25                    increases the size of the font       You can also use the out width and out height arguments to directly define the size of the plot in the output file       r  out width  200px   out height  200px    Expand the plot width to 200 pixels  ggplot aes x mycolumn1  y mycolumn2          specify the x and y aesthetic geom line size 2                             makes the line thicker theme grey base size   25                    increases the size of the font

[r] Plot size and resolution with R markdown, knitr, pandoc, beamer

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