Obtaining R Packages - Aster R

### Step 1: Change this to create initial package list. Enter package names between quotes 

# separate package names with commas and be careful with punctuation

targets <- c("r_packagename_1", " r_packagename_2")  

### Step 2: Change Folder variable to enter destination file directory  

# Please note that with R the direction of the slash is the reverse of the Windows norm
# Windows uses backward slash "C:\Users\..." while R uses forward slash "C:/Users/..." 

folder <- "C:/Documents/Aster/Installation/R/packages" 

### Step 3:  Establish function

getPackages <- function(packs){  
	packages <- unlist(    
		tools::package_dependencies(packs, available.packages(),      
			which=c("Depends", "Imports" , "LinkingTo" ), recursive=TRUE)  
	)  
	packages <- union(packs, packages)  
	packages
} 

packages <- getPackages(targets) 

### Step 4: Execute function 

download.packages(packages, destdir=folder,type="source")