最近我似乎和合作者分享了很多代码。他们中的许多人是新手/中级R用户,并没有意识到他们必须安装他们还没有的包。

是否有一种优雅的方式来调用installed.packages(),比较那些我正在加载和安装如果丢失?


当前回答

站在@MichaelChirico的肩膀上:

stopifnot(3 == length(find.package(c('foo', 'bar', 'baz'))))

其他回答

今天,我偶然发现了rlang包提供的两个方便函数,即is_installed()和check_installed()。

从帮助页面(强调添加):

These functions check that packages are installed with minimal side effects. If installed, the packages will be loaded but not attached. is_installed() doesn't interact with the user. It simply returns TRUE or FALSE depending on whether the packages are installed. In interactive sessions, check_installed() asks the user whether to install missing packages. If the user accepts, the packages are installed [...]. If the session is non interactive or if the user chooses not to install the packages, the current evaluation is aborted.

interactive()
#> [1] FALSE
rlang::is_installed(c("dplyr"))
#> [1] TRUE
rlang::is_installed(c("foobarbaz"))
#> [1] FALSE
rlang::check_installed(c("dplyr"))
rlang::check_installed(c("foobarbaz"))
#> Error:
#> ! The package `foobarbaz` is required.

由reprex包在2022-03-25创建(v2.0.1)

让我分享一点疯狂:

c("ggplot2","ggsci", "hrbrthemes", "gghighlight", "dplyr") %>%  # What will you need to load for this script?
  (function (x) ifelse(t =!(x %in% installed.packages()), 
    install.packages(x[t]),
    lapply(x, require))) 

非常基本的一个。

pkgs = c("pacman","data.table")
if(length(new.pkgs <- setdiff(pkgs, rownames(installed.packages())))) install.packages(new.pkgs)

我想贡献一下我用的:

testin <- function(package){if (!package %in% installed.packages())    
install.packages(package)}
testin("packagename")

达森·k和我有一个吃豆人包可以很好地做到这一点。包中的p_load函数执行此操作。第一行代码只是为了确保安装了pacman。

if (!require("pacman")) install.packages("pacman")
pacman::p_load(package1, package2, package_n)