c# - R.NET 找不到函数 "cor"

Question

我在带有 R.NET 的 C# 网络应用程序中使用 R。当我在我的网络应用程序中添加下面的代码时，出现以下错误。但是当我在控制台应用程序中运行相同的代码时，它工作正常。我不知道为什么它在网络应用程序中不起作用。

错误信息:

An exception of type 'RDotNet.EvaluationException' occurred in RDotNet.dll but was not handled in user code

Additional information: Error: could not find function "cor"

代码:

    public double Test()
    {
        REngine.SetEnvironmentVariables();
        REngine engine = REngine.GetInstance();

        if (engine.IsRunning == false)
        {
            engine.Initialize();
        }

        NumericVector group1 = engine.CreateNumericVector(new double[] { 30.02, 29.99, 30.11, 29.97, 30.01, 29.99 });
        engine.SetSymbol("group1", group1);
        NumericVector group2 = engine.CreateNumericVector(new double[] { 29.89, 29.93, 29.72, 29.98, 30.02, 29.98 });
        engine.SetSymbol("group2", group2);

        var coefficientValue = engine.Evaluate("cor(group1, group2, method = c('pearson'))");
        var coefficientValueNumeric = coefficientValue.AsNumeric();
        double pearsonCoefficient = coefficientValueNumeric.ElementAt(0);
        engine.Dispose();

        return pearsonCoefficient;
    }

Answer 1

我已经找到了这个问题的答案。添加 c:\Program Files\r\R-3.2.0\bin\i386 到机器或用户的 PATH 环境变量。

来源:http://jmp75.github.io/rdotnet/tut_asp_dot_net/