Write single variable (or set of variables) of R script to stdout for calling C# code

Question

I have several R scripts that take in data (likely from arguments passed to Rscript or a bat file), chug through a calculation and at the end output either a list or vector of values (generically floats and strings). How can I output only these values to stdout (or whatever is appropriate) to the calling C# process without resorting to writing and reading files as a middle man?

possible duplicate of Best Way to call external program in c# and parse output — TypeIA
– TypeIA, Commented Mar 18, 2014 at 21:45
Yup, that's the C# end of things, but there are R specific issues (like directing correctly to stdout and only outputting the necessary variables) that the linking question doesn't address. — Tommy Levi
– Tommy Levi, Commented Mar 18, 2014 at 21:53
How to print values to stdout in R would probably justify its own question (or a Google search). The title (and indeed body) of the question does not cover how to print from R. — TypeIA
– TypeIA, Commented Mar 18, 2014 at 21:55
Would you then be satisfied if I updated the title/body of this post to reflect that? — Tommy Levi
– Tommy Levi, Commented Mar 18, 2014 at 21:58

j-m · Accepted Answer · 2014-03-19 21:25:02Z

0

There are several options available to pass data in-memory between R and .NET/Mono or over a network pipe, without file I/O in-between. I'll mention a couple I am partial to, being respectively a contributor to, and author of,

R.NET if the entry point is a program running on .NET or Mono, calling R. A new release is under development.
the rClr package if R is the main process. Mirrored on a GitHub repository. The latest official binary release is available, at the time of writing, at r2clr.codeplex.com.

answered Mar 19, 2014 at 21:25

j-m

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