warning.expression?

Thomas,

You might be interested in 'tryCatch' to catch warnings.

Yes, thanks for pointing it out. However, I'm actually looking for a
way to catch all warnings in a whole (interactive) session. Can
warning.expression be used for that?

Please permit, if you will, some feedback from someone who is quite 
uneducated in R, at least so far, but who has a lot of general 
programming background.

I'm afraid this does not make sense to me. An "interactive session" is 
not some monolithic blob. It is a sequence of one or more (often very 
many) discreet interactions. Any one of these may produce an 
exceptional condition, and it seems to me that each individual 
interaction that elicits an exception should be handled independently 
and if it does produce an exceptional condition, that should be 
reported as soon as it occurs. Things should then be cleaned up, as 
necessary and feasible, and the interactive session should be allowed 
to continue.

Does this make sense? Or am I misunderstanding your use case?

Thomas

Randall Schulz