检查丢失的软件包并安装它们的优雅方法? [英] Elegant way to check for missing packages and install them?

问题描述

这些天我似乎与合著者分享了很多代码.他们中的许多人是R新手/中级用户，他们没有意识到他们必须安装尚未拥有的软件包.

I seem to be sharing a lot of code with coauthors these days. Many of them are novice/intermediate R users and don't realize that they have to install packages they don't already have.

是否有一种优雅的方式来调用installed.packages()，并将其与我正在加载并安装的安装方式进行比较?

Is there an elegant way to call installed.packages(), compare that to the ones I am loading and install if missing?

推荐答案

是.如果您有软件包列表，请将其与installed.packages()[,"Package"]的输出进行比较，然后安装缺少的软件包.像这样:

Yes. If you have your list of packages, compare it to the output from installed.packages()[,"Package"] and install the missing packages. Something like this:

list.of.packages <- c("ggplot2", "Rcpp")
new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,"Package"])]
if(length(new.packages)) install.packages(new.packages)

否则:

如果将代码放入软件包中并使其具有依赖性，则在安装软件包时将自动安装它们.

If you put your code in a package and make them dependencies, then they will automatically be installed when you install your package.

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