I’m totally (re-)inspired with RMarkdown at useR! 2016. A lot going on
including bookdown and markdown documents. The latter making WordPress
blogging reasonable. Here is my first R Markdown generated post.

BTW, I’m putting the .Rmd’s up on my GitHub
here

The trick is WordPress will optionally accept .md files as input to the
blog post edit window. To enable, follow the directions on the
WordPress Markdown page.

R Markdown can produce plain markdown files with variants for different
dialects. See the RStudio Markdown Documents
page

For WordPress, the YAML output parameter should read

output: 
  md_document:
    variant: markdown_phpextra+backtick_code_blocks

The workflow is to knit your .Rmd, then copy the generated markdown and
paste into your WordPress Blog Posts|Add|HTML tab.

There are two gotchas:

• “Note however that if you have embedded plots or other images you’ll
  need to upload them separately and fix up their URLs to point to the
  uploaded location.” (from above RStudio page)
• WordPress does not seem to pick up .md title in its Title box. You
  will need to manually cut & paste the title.

Default RStudio Boilerplate

As an example we use the RStudio boilerplate. The workflow is:

1. RStudio: Knit the .Rmd
2. WordPress|Dashboard|Media: Add image(s) from the _files
   folder to the WordPress Media Library.
3. WordPress|Dashboard|Posts|Add New: Copy the md text from RStudio &
   paste into HTML tab.
4. Copy title text from md to Text & delete title lines from the body.
5. For each image placeholder pointing to R project folder:
   • Delete image placeholder
   • Insert
     <img src="...File URL from media library..." alt="...whatever..." />
6. Don’t forget to select categories and add tags.

7. WordPress: Publish & View Post

R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax
for authoring HTML, PDF, and MS Word documents. For more details on
using R Markdown see .

When you click the Knit button a document will be generated that
includes both content as well as the output of any embedded R code
chunks within the document. You can embed an R code chunk like this:

summary(cars)

##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

Including Plots

You can also embed plots, for example:

Note that the echo = FALSE parameter was added to the code chunk to
prevent printing of the R code that generated the plot.