使用R.Net 1.5.5版创建REngine实例 [英] Creating an instance of the REngine using R.Net version 1.5.5

问题描述

我正在尝试使用 R.Net 1.5.5 (从NuGet加载)在R Language中创建"Hello World"示例.不幸的是，我见过的所有在线样本都没有工作.

I am trying to create a "Hello World" example in R Language using R.Net version 1.5.5 (loaded from NuGet). Unfortunately, none of the online samples that I have seen work.

这就是我要做的:

• 已安装 Microsoft R Open 3.2.4，增强的R发行版

• 已安装用于Visual Studio的R工具( R版本3.2.4(2016-03-16))

• Installed Microsoft R Open 3.2.4, the enhanced R distribution

• Installed R Tools for Visual Studio (R version 3.2.4 (2016-03-16))

创建了一个R项目&测试了一个简单的脚本

Created an R Project & tested a simple script

我的问题:
我看到的所有在线示例都必须使用早期版本，因为我无法为我的生命创建REngine的实例！实际上，我不断得到:

MY PROBLEM:
All of the online examples I have seen must be using an earlier version because I cannot create an instance of the REngine for the LIFE of me! In fact, I keep getting:

找不到Dll

Dll was not found

...但C:\Program Files\Microsoft\MRO\R-3.2.4\bin\x64\r.dll确实存在.

问::如何使用 R.Net 1.5.5版创建REngine的实例?

Q: How do I create an instance of the REngine using R.Net version 1.5.5?

我的代码看起来像:

class Program
{
    #region <Methods>

    static void Main(string[] args)
    {
        SetupPath(); // current process, soon to be deprecated

        using (REngine engine = REngine.CreateInstance("RDotNet"))
        {
            engine.Initialize(); // required since v1.5
            CharacterVector charVec = engine.CreateCharacterVector(new[] {"Hello, R world!, .NET speaking" });

            engine.SetSymbol("greetings", charVec);
            engine.Evaluate("str(greetings)"); // print out in the console

            string[] a = engine.Evaluate("'Hi there .NET, from the R engine'").AsCharacter().ToArray();

            Console.WriteLine("R answered: '{0}'", a[0]);

        }

        Console.WriteLine("Press any key to exit the program");
        Console.ReadKey();
    }

    public static void SetupPath()
    {
        var oldPath = System.Environment.GetEnvironmentVariable("PATH");
        var rPath = @"C:\Program Files\Microsoft\MRO\R-3.2.4\bin\x64";

        if (!Directory.Exists(rPath))
            throw new DirectoryNotFoundException(string.Format(" R.dll not found in : {0}", rPath));

        var newPath = string.Format("{0}{1}{2}", rPath, System.IO.Path.PathSeparator, oldPath);

        System.Environment.SetEnvironmentVariable("PATH", newPath);
    }

    #endregion
}

推荐答案

我不想回答我自己的问题，但这是...

I hate to answer my own question, but here it is...

Microsoft R Open 3.2.4 增强的R发行版会安装x64文件.因此，在任何CPU上运行都会导致失败，因为它将选择x86(默认情况下).

The Microsoft R Open 3.2.4 enhanced R distribution installs x64 files. As such, running under ANY CPU will cause a failure because it will choose x86 (by default).

下
项目属性->构建:在常规"部分

Under
Project Properties -> Build: in the "General" section

• 选择 x64 作为您的Platform Target

• Choose x64 as your Platform Target

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