[R] function to check if an object is present, and if not, load it from my hard drive

r user ruser2006 at yahoo.com
Fri May 5 17:29:04 CEST 2006

I want to check if an "object" (dataset, vector, etc)
is “present”.  If it is present, I will do nothing. 
If it is not present, I will load it from my hard

Is there function to determine if an object is

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