在命令行中运行Rscript并加载程序包

问题描述

我有一个foo.R文件，其中包含

I have a foo.R file which contains

library("ggplot2")
cat("Its working")

我正在尝试使用Rscript命令Rscript --default-packages=ggplot2 foo.R通过命令行运行foo.r，它给了我以下错误:

I am trying to run foo.r via the command line using the Rscript commandRscript --default-packages=ggplot2 foo.R and it is giving me the following error:

1: In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called ‘ggplot2’
2: package ‘ggplot2’ in options("defaultPackages") was not found 
Error in library("ggplot2") : there is no package called ‘ggplot2’
Execution halted

非常感谢在运行"Rscript"时如何加载软件包的帮助.

Any help on how to load packages while running "Rscript" is much appreciated.

推荐答案

对于以后的引用，您可以使用函数require而不是library来避免此错误:require仅返回FALSE并在警告提示时发出警告.未安装软件包，而是抛出错误.因此，您可以进行如下构造:

For future references, you could use function require instead of library to avoid this error: require just returns FALSE and raises a warning if the package is not installed instead of throwing an error. You can therefore do a construct as follows:

if(!require(ggplot2)){install.packages("ggplot2")}

它所做的是尝试加载程序包，如果未安装，则将其安装.

What it does is trying to load the package and, if it is not installed, installs it.

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