Calling user defined functions inside a script in R.Net

Question

I'm having trouble calling my own R functions using R.Net; I have several user defined functions inside some R scripts myScript.R, ..., and I want to call this functions using R.net

this is what I've got so far

one myScript.R file contains several functions like this

userDefinedFunctionOne <- function(parameter1, parameter2)
{
.
.
.
}

userDefinedFunctionTwo <- function(parameter1, parameter2, ...)
.
.
.

and with R.Net, in the constructor of my class I create an instance of the REngine class

private REngine engine;

public MyClass()
{
     this.engine = REngine.GetInstance();
}

then I source the myScript.R file

this.engine.Evaluate(@"source('C:/RScripts/myScript.R')");

but when I call my functions like this

var dataframe = this.engine.Evaluate(string.Format("dataframe <- userDefinedFunctionOne(parameter1 = {0}, parameter2 = {1})",
                                                        value1,
                                                        value2)).AsDataFrame();

I'm getting this error

Error: could not find function "userDefinedFunctionOne"

I've found seen some examples when the user functions is defined like this

Function data = engine.Evaluate(@"data <- function(a,b){ 
    c = a %*% b;
    return(c);
    }").AsFunction();

but I want to avoid that, because as I wrote, I have several functions inside my R script files

is there a way to do this without rewriting my R functions as strings???

I would apreciate any help, thanks

j-m · Accepted Answer · 2015-08-27 14:18:37Z

1

What you describe is just fine and should work (good post by the way, thank you). I do not understand why userDefinedFunctionOne is not found, since it should have been loaded in the global R environment.

I've added a bit of code in one of the sample applications I use: SourceRCode

The code derived from your post ran just fine, I could see the expected data frame from visual studio in debug mode. Can you give it a try and report if you have the issue or not with this sample application?

The sample application uses the latest NuGet package (1.6.5 as of writing), but it looks like you are using a recent version of R.NET given the methods, and I to not expect version to the be cause of the issue.

answered Aug 27, 2015 at 14:18

j-m

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1 Comment

streetwizard Over a year ago

the problem was that I wasn't calling REngine.SetEnvironmentVariables(); before getting the Rengine instance this.engine = REngine.GetInstance(); I saw that in the example, added that line and it's working now, Thank You

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