[R] Does inverse function exist

From: <phwang2000_at_ucla.edu>
Date: Sat 27 Jan 2007 - 05:45:38 GMT


Hi,

I wrote a simple derivative program

(ftest=deriv(y~x^2, c("x"), function(x){} ))

I put (ftest=deriv(y~x^2, c("x"), function(x){} ))(1) which return 2 which is correct.

however, if I want the output to be 0 and hopefully a new inverse function can take in output (2) and return x=1. Can this be accomplished. Maybe output(0) can return x=0

Thanks
pat



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