Hi, I have a scalar valued function with several variables. One of the variables is restricted to be non-negative. For example, f(x,y)=sqrt(x)*exp(y), then x should be non-negative. I need the gradient and hessian for some vector (0,y), i.e., I need the gradient and hessian at the boudary of parameter space.
The "numderiv" package does not work, even for f(x)=sqrt(x), if you do "genD(f,x=0)", warning message comes out. I need the one sided derivatives. Thanks if you could provide some help. -- View this message in context: http://www.nabble.com/Any-numeric-differentiation-routine-in-R-for-boundary-points--tp15110811p15110811.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
