[R] request if a variable is defined

From: Paul Hammer <paul.hammer_at_tfh-wildau.de>
Date: Tue, 04 Mar 2008 16:38:31 +0100

hi members,

give it a function for requesting if a object, matrix, vector, variable or whatever already exists?

e.g. if (*exists*(a) {print("yes") } else { print("no") }


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