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
我已经实现了无声安装和加载所需R包的功能。希望也许会有所帮助。代码如下:
# Function to Install and Load R Packages
Install_And_Load <- function(Required_Packages)
{
Remaining_Packages <- Required_Packages[!(Required_Packages %in% installed.packages()[,"Package"])];
if(length(Remaining_Packages))
{
install.packages(Remaining_Packages);
}
for(package_name in Required_Packages)
{
library(package_name,character.only=TRUE,quietly=TRUE);
}
}
# Specify the list of required packages to be installed and load
Required_Packages=c("ggplot2", "Rcpp");
# Call the Function
Install_And_Load(Required_Packages);
其他回答
source("https://bioconductor.org/biocLite.R")
if (!require("ggsci")) biocLite("ggsci")
pckg=c("shiny","ggplot2","dplyr","leaflet","lubridate","RColorBrewer","plotly","DT","shinythemes")
for(i in 1:length(pckg))
{
print(pckg[i])
if (!is.element(pckg[i], installed.packages()[,1]))
install.packages(pckg[i], dep = TRUE)
require(pckg[i], character.only = TRUE)
}
我已经实现了无声安装和加载所需R包的功能。希望也许会有所帮助。代码如下:
# Function to Install and Load R Packages
Install_And_Load <- function(Required_Packages)
{
Remaining_Packages <- Required_Packages[!(Required_Packages %in% installed.packages()[,"Package"])];
if(length(Remaining_Packages))
{
install.packages(Remaining_Packages);
}
for(package_name in Required_Packages)
{
library(package_name,character.only=TRUE,quietly=TRUE);
}
}
# Specify the list of required packages to be installed and load
Required_Packages=c("ggplot2", "Rcpp");
# Call the Function
Install_And_Load(Required_Packages);
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)))
关于你的主要目标“安装他们还没有的库”。并且不管使用" installed .packages() "”。下面的函数掩码了require的原始函数。它尝试加载和检查命名包“x”，如果它没有安装，直接安装它，包括依赖项;最后正常加载。将函数名从'require'重命名为'library'以保持完整性。唯一的限制是包名应该加引号。
require <- function(x) {
if (!base::require(x, character.only = TRUE)) {
install.packages(x, dep = TRUE) ;
base::require(x, character.only = TRUE)
}
}
所以你可以加载和安装包的旧时尚的方式R。 要求(“ggplot2”) 要求(“Rcpp”)
