Question

我想使用Visual Studio C＃2012中的R软件。我注意到有人用R.NET做过这个。我安装R.2.15.2（我找到的版本）。我注意到R.NET只适用于R（32位）。我已经安装了32和64但我链接到32位。程序找不到DLL并抛出DLL找不到异常。我注意到envPath是空的，无法找到变量。我想知道是否有人可以帮助我。

谢谢。

static void Main(string[] args)
{
    string PATH = @"c:\Users\Documents\Visual Studio 2012\Projects\ConsoleApplication1\packages\R.NET.1.5.0\lib\net40";
    // Set the folder in which R.dll locates.
    var envPath = Environment.GetEnvironmentVariable(PATH);
    var rBinPath = @"C:\Program Files\R\R-2.15.2\bin\i386";
    Environment.SetEnvironmentVariable(PATH, envPath + Path.PathSeparator + rBinPath);
    using (REngine engine = REngine.CreateInstance("RDotNet"))
    {
        // Initializes settings.
        engine.Initialize();

        // .NET Framework array to R vector.
        NumericVector group1 = engine.CreateNumericVector(new double[] { 30.02, 29.99, 30.11, 29.97, 30.01, 29.99 });
        engine.SetSymbol("group1", group1);
        // Direct parsing from R script.
        NumericVector group2 = engine.Evaluate("group2 <- c(29.89, 29.93, 29.72, 29.98, 30.02, 29.98)").AsNumeric();

        // Test difference of mean and get the P-value.
        GenericVector testResult = engine.Evaluate("t.test(group1, group2)").AsList();
        double p = testResult["p.value"].AsNumeric().First();

        Console.WriteLine("Group1: [{0}]", string.Join(", ", group1));
        Console.WriteLine("Group2: [{0}]", string.Join(", ", group2));
        Console.WriteLine("P-value = {0:0.000}", p);
    }
}

Answer 1

var currentPath = Environment.GetEnvironmentVariable("path");
var pathWithR = string.Join(";", currentPath, rPath1, rPath2, ...);
Environment.SetEnvironmentVariable("path", pathWithR);

MSDN Environment.GetEnvironmentVariable
MSDN Environment.SetEnvironmentVariable

使用R.NET在R和C＃之间建立联系

1 个答案: