[R] list of variables of an expression

From: Alberto Lusiani <alusiani_at_gmail.com>
Date: Tue, 15 Jun 2010 23:45:39 +0200

I would like to get the list of variables of an expression: is that possible?  I searched the help and the web without success.  In practice, given an expression like

expr = parse(text="x^2+y^3")

I would like to have a function such as:



c("x", "y") or a list like the one returned by formals().



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Received on Tue 15 Jun 2010 - 21:49:43 GMT

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