postmortem.R

# Save state on error to facilitate debugging

postmortem <- function() {
  # SAVE TO SOMEWHERE BOTH YOU AND THE RUNNING PROGRAM HAVE ACCESS
  save.image("postmortem.RData")
  # Skip irrelevant levels of traceback, see the "If x is numeric" part of ?traceback.
  traceback(3)
  stop()
}

options(error=postmortem)

# Your code goes here
x <- 42

# Example of code that causes an error
glm()

# Profit: You can now, even in a new session,
# load(postmortem.RData)
# and you will see x = 42