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What I am trying to do is load a data file from the local directory. If it is not there then download it from a webserver. Currently I am using a nested tryCatch and it appears to work. Is this the correct way to attempt to complete this task in R? tryCatch( { #attempt to read file from current directory # use assign so you can access the variable outside of the function assign("installations", read.csv('data.csv'), envir=.GlobalEnv) print("Loaded installation data from local storage") }, warning = function( w ) { print()# dummy warning function to suppress the output of warnings }, error = function( err ) { print("Could not read data from current directory, attempting download...") #attempt to read from website tryCatch( { # use assign so you can access the variable outside of the function assign("installations", read.csv('http://somewhere/data.csv'), envir=.GlobalEnv) print("Loaded installation data from website") }, warning = function( w ) { print()# dummy warning function to suppress the output of warnings }, error = function( err ) { print("Could not load training data from website!! Exiting Program") }) })

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