Mac环境下RMarkdown knit至PDF时嵌入式图表缺失问题求助

Hey there, sorry to hear you're stuck with missing earlywarnings plots when knitting your RMarkdown to PDF—especially since HTML works perfectly! Let's break down some targeted fixes for your Mac/RStudio/R setup:

• Explicitly print your plots
  A common quirk with specialized packages like earlywarnings is that their plots don’t auto-render in the PDF knitting pipeline (HTML handles this automatically). Try wrapping your plotting code in print() to force it to show up:

  library(earlywarnings)
  # Prep your data first
  my_plot <- ew_metrics(your_dataset) # Replace with your actual plot call
  print(my_plot)
  

• Switch to the Cairo PDF device
  The default PDF device on Mac can have compatibility issues with certain plot types. Add this setup chunk at the very top of your RMarkdown file to use the more robust Cairo device:

  ```{r setup, include=FALSE}
  knitr::opts_chunk$set(dev = "cairo_pdf")
  # Install Cairo if you haven't already: install.packages("Cairo")
  

• Double-check your chunk options
  Make sure your code chunk settings aren’t accidentally suppressing plots. Verify you have:

  • fig.show = "asis" or fig.keep = "all" if generating multiple plots in one chunk
  • Avoid include = FALSE unless you specifically want to hide all output from the chunk
    Example chunk header:

  ```{r earlywarnings-plot, fig.width=8, fig.height=6, fig.show="asis"}
  # Your plotting code here
  

• Ensure your TeX environment is complete
  PDF knitting relies on a full TeX installation (like MacTeX). If you haven’t updated it in a while, refreshing your MacTeX setup can fix silent rendering failures—missing TeX packages are a frequent culprit for missing plots.

• Update key packages
  Even with your older R version (3.4.3), updating knitr, rmarkdown, and earlywarnings to the latest compatible versions might resolve the bug. Run this in your R console:

  update.packages(c("knitr", "rmarkdown", "earlywarnings"), ask = FALSE)
  

Fallback: Save plot as PNG and embed it #

If the above fixes don’t work, you can generate the plot as a static image first and then include it in your PDF:

```{r plot-save, echo=FALSE}
# Save plot to a PNG file
png("ew_plot.png", width = 800, height = 600, res = 100)
ew_metrics(your_dataset) # Your plot code
dev.off()

内容的提问来源于stack exchange，提问作者Melinda Martinez