RSCRIPT不承认setGeneric功能 [英] Rscript does not recognize setGeneric function

问题描述

我尝试的R脚本转换到的东西，客户可以在批处理模式下运行。我的code使用泛型函数和一个片段是附近的开始是这样：

I am trying to convert an R script into something that a client can run in batch mode. My code uses generic functions and one snippet which is near the beginning goes like:

setGeneric("testInput", function(inputData, params = list())
    standardGeneric("testInput"))

我一直在使用

研究CMD批并能正常工作。但是我无法找到一个简单的方法，使我的剧本打印控制台上的输出，从而基于（和建议，Rscript.exe是正确的方式来运行R.批处理文件）我决定改用<强> RSCRIPT 。运行与RSCRIPT非常相同.R文件然而，当我得到以下内容：

I've been using R CMD BATCH and it works fine. However I couldn't find an easy way to make my script print the output on the console, so based on that (and suggestion that Rscript.exe is the "proper" way to run R batch files) I decided to switch to Rscript. However when running the very same .R file with Rscript I get the following:

Error: could not find function "setGeneric"
Execution halted

我知道有可能是这背后一个微不足道的原因，但我只是不明白。可有人请点我哪里错是什么？结果有什么建议？

I know there is probably a trivial reason behind this but I just cannot figure it out. Can someone please point me to where the mistake is?
Any suggestions?

推荐答案

setGeneric 是方法的一部分包当你在一个交互式会话在非交互式会话使用开始ř但不是它通常装 RSCRIPT 或利特勒。

setGeneric is part of the methods package which is usually loaded when you start R in an interactive session but not in non interactive session using Rscript or littler.

所以，你需要添加一个要求（方法）之前调用 setGeneric 在你的脚本。

So you need to add a require(methods) before calling setGeneric in your script.

例如，这code将无法正常工作

For example, this code will not work

Rscript -e "setGeneric('mean', function(x) standardGeneric('mean'))"
Error: could not find function "setGeneric"
Execution halted

但是这一次将工作

But this one will work

Rscript -e "require(methods);setGeneric('mean', function(x) standardGeneric('mean'))"
Loading required package: methods
[1] "mean"

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