CodeGuyRoss CodeGuyRoss - 1 year ago 173
C# Question

Is it possible to Run R Code from Unity C# in Mono or .NET on OSX?

Is there a way to run a R script using Unity's C# in Mono?

If there is no way to run an R script using Mono, I am willing to use .NET


So the following code will call the R script but will not output a file if called from unity monodevelop. It would be ok to return a string to mono but changing the true and false on startInfo.UseShellExecute and startInfo.RedirectStandardOutput throws an error. Here is the C# code that will call the R code:

System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
startInfo.FileName = "Rscript";
startInfo.WorkingDirectory = Application.dataPath + "/myUnity/Scripts/";
startInfo.Arguments = "Rexp1.R";
startInfo.CreateNoWindow = true;
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.UseShellExecute = true;
startInfo.RedirectStandardOutput = false;
process.StartInfo = startInfo;

I know for sure that the R script will output a file or I can grab stdout and hold onto it. I will be happy with outputting to a file or having unity allow for a string to be returned that is the output of the R script.

Update 2*
Here is the R script.

nts <- matrix(rnorm(100), nrow = 500)
ds <- dist(nts,method = "euclidean", diag = TRUE, upper=TRUE)
dm <- as.matrix(ds) # distance matrix
mode(dm) <- "numeric"
Threashold <- mean(dm)
NVertices <- 1000000000 # assign some big number
while((NVertices>100)&&(Threashold>0.0)) {
# convert matrix into igraph object
ig <- graph.adjacency(dm,mode="undirected",diag=FALSE, weighted=TRUE)
ig <- delete.edges(ig, E(ig)[weight>=10.0])
ig <- delete.vertices(ig, which(degree(ig)<1))
Threashold <- Threashold-0.05
NVertices <- vcount(ig)

Answer Source

Just read from the output of the process like what you have done.

I don't have a MAC computer, but it should be the same. See comments in the code.

Your R script has error on my machine, so it output to stderr instead of stdout.

using UnityEngine;

public class RunR : MonoBehaviour
    void Start ()
        System.Diagnostics.Process process = new System.Diagnostics.Process();
        // For macOS, here should be
        //     I. "/bin/sh"
        //     II. "path_of_the_Rscript"
        process.StartInfo.FileName = @"E:\Program Files\R\R-3.3.2\bin\x64\Rscript.exe";
        // For macOS, here should be
        //     I. "-c path_of_the_Rscript Rexp1.R" if "/bin/sh" is used
        //     II. "Rexp1.R" if "path_of_the_Rscript" is used
        process.StartInfo.Arguments = "Rexp1.R";
        process.StartInfo.WorkingDirectory = Application.dataPath;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.RedirectStandardError = true;
        //read the output
        string output = process.StandardOutput.ReadToEnd();
        string err = process.StandardError.ReadToEnd();



Note the project view. There are a Rexp1.R and a RunR.cs. The first output is Object, because there is no output from stdout and thus output is null.

After I changed the content of Rexp1.R to the following,


the output in console view becomes:

normal output


After installing the igraph package and removing sink("output.txt") and the last sink(), the output is:

possible correct output

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