Hi I am extensively using R to process large amount of data. I tried to source my scripts to run sequentially in R, instead of running them seperately. However, I always receive an error message related to the memory size although I upgraded my RAM from 8GB to 16GB. i do not think this is the main problem. This is simply because when I import a script using (open script) and run it, it works. But, when I try to source this script (even only one script), i receive the same message Error in memory.size(min = TRUE) : unused argument (min = TRUE) By the way, my script simply looks like: memory.size(max=TRUE) memory.limit() gc() memory.limit(16000) memory.size() gc() rm(list=ls(all=TRUE)) source("H:\\HIRAM\\Script_1.R") cheers Ahmed Kenawy