c# - R 引擎未初始化

Question

static void Main(string[] args)
{
    // Set the folder in which R.dll locates.
    var envPath = Environment.GetEnvironmentVariable("PATH");
    var rBinPath = @"C:\R-3.0.2\bin\i386\";
    Environment.SetEnvironmentVariable("PATH", envPath + Path.PathSeparator + rBinPath);
    using (REngine engine = REngine.CreateInstance("RDotNet"))
    {
        // Initializes settings.
        engine.Initialize(); // After Executing this line its crashing.

        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.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);
        Console.ReadLine();
    }

嗨当我执行上面的代码时，它在初始化时崩溃了。操作系统是 Windows XP sp3(32 位)R 版本- R-3.0.2使用 R.Net(1.5 版本)

请帮助我从 C# 连接到 R

Answer 1

我认为引擎崩溃是因为你有一些 R 路径错误。最好从 Windows 注册表中读取路径。

尝试这样的事情:

using (RegistryKey registryKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\R-core\R")){
    var envPath = Environment.GetEnvironmentVariable("PATH");
    string rBinPath = (string)registryKey.GetValue("InstallPath");
    string rVersion = (string)registryKey.GetValue("Current Version");
    rBinPath = System.Environment.Is64BitProcess ? rBinPath + "\\bin\\x64" : 
                                                     rBinPath + "\\bin\\i386";
    Environment.SetEnvironmentVariable("PATH", 
                          envPath + Path.PathSeparator + rBinPath);
}
using (REngine engine = REngine.CreateInstance("RDotNet")){
              // same code here 
}

当然你应该添加正确的引用:

using Microsoft.Win32;
using RDotNet;
using System.IO;