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

Question

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 Update 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.StartI…

Accepted Answer

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;
        process.Start();
        //read the output
        string output = process.StandardOutput.ReadToEnd();
        string err = process.StandardError.ReadToEnd();
        process.WaitForExit();
        Debug.Log(output);
        Debug.LogError(err);
    }
}
```

Ouput:

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,

```
print("12345")
print("ABCDE")
```

the output in console view becomes:

UPDATE:

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

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

Solution

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