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

[Chuck Cleland]

?exists

r user wrote:
> 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
> drive.
> 
> Is there function to determine if an object is
> present?
> 
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Chuck Cleland, Ph.D.
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