[R] Detect the presence of an object

Francisco J Molina fjmolina at ams.ucsc.edu
Fri Jan 30 21:58:37 CET 2004

Is there a  function like "is.there" such that 

is.there ( a ) returns TRUE is object 'a' is in the current environment and
FALSE otherwise?

Thank you.
Francisco J. Molina

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