D For Data Science: Calling R from D

[jmh530]

On Monday, 27 January 2020 at 14:16:47 UTC, Mike Parker wrote:
> You've seen Lance Bachmeier posting in the forums under the 
> bachmeier handle. He's put together a post for the D Blog 
> showing how to integrate R into a D program.
>
> The Blog:
> https://dlang.org/blog/2020/01/27/d-for-data-science-calling-r-from-d/
>
> Reddit:
> https://www.reddit.com/r/programming/comments/euobu1/d_for_data_science_calling_r_from_d/
>
> It's also on Hacker News. If it isn't on the front page, just 
> search for "D for Data Science". Please don't post a direct 
> link if you find it on there, not until after it's been on 
> there a few days.
>
> https://news.ycombinator.com/

Great piece. Glad to see it.

One point that is confusing is below:

"There are two ways to execute R code from a D program. evalR 
executes a string in R and prints the output to the screen, while 
evalRQ does the same thing but suppresses the output. evalRQ also 
accepts an array of strings that are executed sequentially."

So evalR normally prints the output to the screen, but evalRQ 
does not unless you specify it with a print statement. However, 
in Example 4 later have an array of strings with a print 
statement at the end but it says that it won't print from it. So 
does Example 4 print or not? Maybe distinguish between suppress 
in D and print with R a little more clearly?

In addition, the embedr documentation could probably be more 
clear on the difference between evalR and evalRQ using some of 
this text.