rstudio knitr 不是 运行 pdfcrop

rstudio knitr not running pdfcrop

我正在尝试使用 rstudio (1.2.5019) 将下面的 mwe 编织成 pdf

---
title: "Test"
author: "Me"
output: 
  pdf_document: 
    fig_caption: yes
    keep_tex: yes
    fig_crop: yes
---
This should be cropped
```{r}
library(knitr)
```



```{r named-chunk}
plot(x <- 0:100, dbinom(x, size=100, prob=0.6), type='l',
     main="Not cropped", xlab="Looks good", ylab="Nok")
```

输出的 pdf 看起来不错,只是绘图没有用 pdfcrop 裁剪。

这是日志输出。

processing file: cropping.Rmd |..................
| 25% ordinary text without R code

|...................................
| 50% label: unnamed-chunk-1
|....................................................
| 75% ordinary text without R code

|......................................................................| 100% label: named-chunk

output file: cropping.knit.md

"C:/Program Files/RStudio/bin/pandoc/pandoc" +RTS -K512m -RTS cropping.utf8.md --to latex --from markdown+autolink_bare_uris+tex_math_single_backslash --output cropping.tex --self-contained --highlight-style tango --pdf-engine pdflatex --variable graphics --lua-filter "C:/Users/marti/Documents/R/win-library/3.6/rmarkdown/rmd/lua/pagebreak.lua" --lua-filter "C:/Users/marti/Documents/R/win-library/3.6/rmarkdown/rmd/lua/latex-div.lua" --variable "geometry:margin=1in"

Output created: cropping.pdf

pdfcrop 在我的命令行中工作得很好,但 rstudio 没有调用它。它也位于 rstudio.

Sys.which('pdfcrop') pdfcrop "C:\texlive19\bin\win32\pdfcrop.exe"

我错过了什么?

这实际上解决了它。

``` {r crop-hook,cache=FALSE}
    knit_hooks$set(crop=hook_pdfcrop)
```


```{r named-chunk, crop=TRUE}
plot(x <- 0:100, dbinom(x, size=100, prob=0.6), type='l',
     main="Not cropped", xlab="Looks good", ylab="Nok")
```

据我从文档中了解到,这不是必需的吗?

通过 livetexmiktex 安装 pdfcrop --- 您用来编写乳胶文档的那个。