[R] Does inverse function exist

phwang2000 at ucla.edu phwang2000 at ucla.edu
Sat Jan 27 06:45:38 CET 2007


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


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