qb45532 <br /> > library(rootSolve)<br /> > hessian(function(x) x^3,2)<br /> [,1]<br /> [1,] 20.64535<br /> > detach(package:rootSolve)<br /> > library(pracma)<br /> > hessian(function(x) x^3,2)<br /> [,1]<br /> [1,] 12<br /> </p>
