R help - Sep 2009 - how to determine if a variable has already been initialized?

Hi,
It might be a primitive question but how it is possible to determine if a
variable is initialized in an environment? Suppose that we start a R session and
wants to run a script which uses the variable i. Which function could evaluate
if i exists already and has been initialized or not? The purpose is to avoid the
message: error, object i is not found.

Regards,

Carol



      
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