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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