Illegal unit of measure in pdf with fig.retina in bookdown::pdf_document2

[chendaniely]

Using the fig.retina knitr option causes an "Illegal unit of measure" when trying to generate a pdf when the output is bookdown::pdf_document2.

It seems like in the intermediate .tex file, the \includegraphics just has a number for the width, but does not have a unit.
For example:

\includegraphics[width=720]{/home/dchen/Desktop/04-data-workflows/analysis/figures/demo-multi-1} \caption{The caption.}\label{fig:demo-multi}

but chaning it to

\includegraphics[width=720px]{/home/dchen/Desktop/04-data-workflows/analysis/figures/demo-multi-1} \caption{The caption.}\label{fig:demo-multi}

will let me run pdflatex to generate the pdf.

Minimal example:

This works:

---
output:
  bookdown::pdf_document2: default
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

```{r pressure, echo=FALSE}
plot(pressure)
```

This does not work:

---
output:
  bookdown::pdf_document2: default
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, fig.retina = 3)
```

```{r pressure, echo=FALSE}
plot(pressure)
```

Returns this error:

/usr/lib/rstudio/bin/pandoc/pandoc +RTS -K512m -RTS asdf.utf8.md --to latex --from markdown+autolink_bare_uris+ascii_identifiers+tex_math_single_backslash --output asdf.tex --table-of-contents --toc-depth 2 --template /home/dchen/R/x86_64-pc-linux-gnu-library/3.6/rmarkdown/rmd/latex/default-1.17.0.2.tex --number-sections --highlight-style tango --pdf-engine pdflatex --variable graphics=yes --wrap preserve --variable 'geometry:margin=1in' --variable 'compact-title:yes' --variable tables=yes --standalone 
output file: asdf.knit.md

! Illegal unit of measure (pt inserted).
<to be read again> 
                   \relax 
l.91 ...h=468]{asdf_files/figure-latex/pressure-1}

Error: Failed to compile asdf.tex. See https://yihui.name/tinytex/r/#debugging for debugging tips. See asdf.log for more info.
Execution halted

My session info:

> devtools::session_info()
─ Session info ─────────────────────────────────────────────────────────────────────────────────────────────
 setting  value                       
 version  R version 3.6.1 (2019-07-05)
 os       Antergos Linux              
 system   x86_64, linux-gnu           
 ui       RStudio                     
 language (EN)                        
 collate  en_US.UTF-8                 
 ctype    en_US.UTF-8                 
 tz       America/New_York            
 date     2019-09-12                  

─ Packages ─────────────────────────────────────────────────────────────────────────────────────────────────
 package     * version  date       lib source                          
 arsenal     * 3.3.0    2019-09-07 [1] CRAN (R 3.6.1)                  
 assertthat    0.2.1    2019-03-21 [1] CRAN (R 3.6.0)                  
 backports     1.1.4    2019-04-10 [1] CRAN (R 3.6.0)                  
 bookdown      0.13     2019-08-21 [1] CRAN (R 3.6.1)                  
 broom         0.5.2    2019-04-07 [1] CRAN (R 3.6.0)                  
 callr         3.3.1    2019-07-18 [1] CRAN (R 3.6.1)                  
 cellranger    1.1.0    2016-07-27 [1] CRAN (R 3.6.0)                  
 cli           1.1.0    2019-03-19 [1] CRAN (R 3.6.0)                  
 colorspace    1.4-1    2019-03-18 [1] CRAN (R 3.6.0)                  
 cowplot     * 1.0.0    2019-07-11 [1] CRAN (R 3.6.1)                  
 crayon        1.3.4    2017-09-16 [1] CRAN (R 3.6.0)                  
 data.table    1.12.2   2019-04-07 [1] CRAN (R 3.6.0)                  
 desc          1.2.0    2018-05-01 [1] CRAN (R 3.6.0)                  
 devtools      2.2.0    2019-09-07 [1] CRAN (R 3.6.1)                  
 digest        0.6.20   2019-07-04 [1] CRAN (R 3.6.1)                  
 dplyr       * 0.8.3    2019-07-04 [1] CRAN (R 3.6.1)                  
 DT            0.8      2019-08-07 [1] CRAN (R 3.6.1)                  
 ellipsis      0.2.0.1  2019-07-02 [1] CRAN (R 3.6.1)                  
 evaluate      0.14     2019-05-28 [1] CRAN (R 3.6.0)                  
 forcats     * 0.4.0    2019-02-17 [1] CRAN (R 3.6.0)                  
 fs            1.3.1    2019-05-06 [1] CRAN (R 3.6.1)                  
 generics      0.0.2    2018-11-29 [1] CRAN (R 3.6.0)                  
 ggplot2     * 3.2.1    2019-08-10 [1] CRAN (R 3.6.1)                  
 ggpubr      * 0.2.3    2019-09-03 [1] CRAN (R 3.6.1)                  
 ggsignif      0.6.0    2019-08-08 [1] CRAN (R 3.6.1)                  
 glue          1.3.1    2019-03-12 [1] CRAN (R 3.6.1)                  
 gridExtra     2.3      2017-09-09 [1] CRAN (R 3.6.0)                  
 gtable        0.3.0    2019-03-25 [1] CRAN (R 3.6.0)                  
 haven         2.1.1    2019-07-04 [1] CRAN (R 3.6.1)                  
 here        * 0.1      2017-05-28 [1] CRAN (R 3.6.0)                  
 hms           0.5.1    2019-08-23 [1] CRAN (R 3.6.1)                  
 htmltools     0.3.6    2017-04-28 [1] CRAN (R 3.6.0)                  
 htmlwidgets   1.3      2018-09-30 [1] CRAN (R 3.6.0)                  
 httr          1.4.1    2019-08-05 [1] CRAN (R 3.6.1)                  
 jsonlite      1.6      2018-12-07 [1] CRAN (R 3.6.0)                  
 km.ci         0.5-2    2009-08-30 [1] CRAN (R 3.6.1)                  
 KMsurv        0.1-5    2012-12-03 [1] CRAN (R 3.6.1)                  
 knitr         1.24     2019-08-08 [1] CRAN (R 3.6.1)                  
 labeling      0.3      2014-08-23 [1] CRAN (R 3.6.0)                  
 lattice       0.20-38  2018-11-04 [2] CRAN (R 3.6.1)                  
 lazyeval      0.2.2    2019-03-15 [1] CRAN (R 3.6.0)                  
 lubridate     1.7.4    2018-04-11 [1] CRAN (R 3.6.0)                  
 magrittr    * 1.5      2014-11-22 [1] CRAN (R 3.6.0)                  
 Matrix        1.2-17   2019-03-22 [2] CRAN (R 3.6.1)                  
 memoise       1.1.0    2017-04-21 [1] CRAN (R 3.6.0)                  
 modelr        0.1.5    2019-08-08 [1] CRAN (R 3.6.1)                  
 munsell       0.5.0    2018-06-12 [1] CRAN (R 3.6.0)                  
 nlme          3.1-141  2019-08-01 [1] CRAN (R 3.6.1)                  
 packrat       0.5.0-16 2019-07-02 [1] Github (rstudio/packrat@d7ad4c2)
 pillar        1.4.2    2019-06-29 [1] CRAN (R 3.6.1)                  
 pkgbuild      1.0.5    2019-08-26 [1] CRAN (R 3.6.1)                  
 pkgconfig     2.0.2    2018-08-16 [1] CRAN (R 3.6.0)                  
 pkgload       1.0.2    2018-10-29 [1] CRAN (R 3.6.0)                  
 prettyunits   1.0.2    2015-07-13 [1] CRAN (R 3.6.0)                  
 processx      3.4.1    2019-07-18 [1] CRAN (R 3.6.1)                  
 ps            1.3.0    2018-12-21 [1] CRAN (R 3.6.0)                  
 purrr       * 0.3.2    2019-03-15 [1] CRAN (R 3.6.0)                  
 R6            2.4.0    2019-02-14 [1] CRAN (R 3.6.0)                  
 Rcpp          1.0.2    2019-07-25 [1] CRAN (R 3.6.1)                  
 readr       * 1.3.1    2018-12-21 [1] CRAN (R 3.6.0)                  
 readxl        1.3.1    2019-03-13 [1] CRAN (R 3.6.0)                  
 remotes       2.1.0    2019-06-24 [1] CRAN (R 3.6.1)                  
 rlang         0.4.0    2019-06-25 [1] CRAN (R 3.6.0)                  
 rmarkdown     1.15     2019-08-21 [1] CRAN (R 3.6.1)                  
 rprojroot     1.3-2    2018-01-03 [1] CRAN (R 3.6.0)                  
 rsconnect     0.8.15   2019-07-22 [1] CRAN (R 3.6.1)                  
 rstudioapi    0.10     2019-03-19 [1] CRAN (R 3.6.0)                  
 rvest         0.3.4    2019-05-15 [1] CRAN (R 3.6.0)                  
 scales        1.0.0    2018-08-09 [1] CRAN (R 3.6.0)                  
 scico       * 1.1.0    2018-11-20 [1] CRAN (R 3.6.1)                  
 sessioninfo   1.1.1    2018-11-05 [1] CRAN (R 3.6.0)                  
 stringi       1.4.3    2019-03-12 [1] CRAN (R 3.6.0)                  
 stringr     * 1.4.0    2019-02-10 [1] CRAN (R 3.6.0)                  
 survival    * 2.44-1.1 2019-04-01 [2] CRAN (R 3.6.1)                  
 survminer   * 0.4.6    2019-09-03 [1] CRAN (R 3.6.1)                  
 survMisc      0.5.5    2018-07-05 [1] CRAN (R 3.6.1)                  
 testthat      2.2.1    2019-07-25 [1] CRAN (R 3.6.1)                  
 tibble      * 2.1.3    2019-06-06 [1] CRAN (R 3.6.0)                  
 tidyr       * 0.8.3    2019-03-01 [1] CRAN (R 3.6.0)                  
 tidyselect    0.2.5    2018-10-11 [1] CRAN (R 3.6.0)                  
 tidyverse   * 1.2.1    2017-11-14 [1] CRAN (R 3.6.0)                  
 usethis       1.5.1    2019-07-04 [1] CRAN (R 3.6.1)                  
 vctrs         0.2.0    2019-07-05 [1] CRAN (R 3.6.1)                  
 withr         2.1.2    2018-03-15 [1] CRAN (R 3.6.0)                  
 xfun          0.9      2019-08-21 [1] CRAN (R 3.6.1)                  
 xml2          1.2.2    2019-08-09 [1] CRAN (R 3.6.1)                  
 xtable        1.8-4    2019-04-21 [1] CRAN (R 3.6.0)                  
 yaml          2.2.0    2018-07-25 [1] CRAN (R 3.6.0)                  
 zeallot       0.1.0    2018-01-28 [1] CRAN (R 3.6.0)                  
 zoo           1.8-6    2019-05-28 [1] CRAN (R 3.6.0)                  

[1] /home/dchen/R/x86_64-pc-linux-gnu-library/3.6
[2] /usr/lib/R/library

> xfun::session_info('knitr')
R version 3.6.1 (2019-07-05)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Antergos Linux, RStudio 1.2.1578

Locale:
  LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8       
  LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
  LC_PAPER=en_US.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
  LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

Package version:
  evaluate_0.14   glue_1.3.1      graphics_3.6.1  grDevices_3.6.1 highr_0.8       knitr_1.24     
  magrittr_1.5    markdown_1.1    methods_3.6.1   mime_0.7        stats_3.6.1     stringi_1.4.3  
  stringr_1.4.0   tools_3.6.1     utils_3.6.1     xfun_0.9        yaml_2.2.0  

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[yihui]

The option fig.retina makes no sense for non-HTML output formats, as documented at: https://yihui.name/knitr/options/#plots

[chendaniely]

Thanks, Yihui. Now that you mention it, it does make sense that fig.retina should only make sense for HTML documents, but it seems like it's still being used when outputting to pdf (e.g., the \includegraphics[width=720] gets created in the tex file when fig.width=10 is set in the rmd document)

The example @apreshill had was being able to output to multiple types within the same rmd document, so all the options were in one setup chunk.

[yihui]

I just pushed a commit to avoid the error, but fig.retina still does not make sense for LaTeX output.

Note that fig.retina = 2 for HTML output by default. You probably don't need to adjust the default, unless your eyes are really really good :) (I can't tell the difference between fig.retina = 2 and 3)

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