get_graphab: Download Graphab if not present on the user's machine
Description
The function checks for the presence of Graphab (.jar) on the
user's machine and downloads it if absent. It also checks that users have
installed java on their machine.
Usage
get_graphab(res = TRUE, return = FALSE)
Value
If res = TRUE, the function displays a message indicating to users
what has been done.
If return = TRUE, it returns a 0 if Graphab is already on the machine and
a 1 if it has been downloaded.
Arguments
res
Logical indicating whether a message says if Graphab has been
downloaded or not.
return
Logical indicating whether the function returns a 1 or a 0
to indicate if Graphab has been downloaded or not.