New Post: Getting summary() output to C#

Since we don't have your data, its difficult to reproduce your problem exactly. If you could build the most minimal example around mtcars, that would be helpful.

If I do this,

            var engine = REngine.GetInstance();
            engine.Evaluate("tree <- c(1,2,3,4,5,6,7,8,9)");
            GenericVector summary2 = engine.Evaluate("summary(tree)").AsList();

I get the correct result in summary2, so we know that the RDotNet layer is working. I would assume that there's a syntax issue with your code or something similar. Ensure that you have enabled break on execeptions in your debugger, or are catching and logging the RDotNet exceptions.