search for: fnoise

Admittedly I am using an old version 1.7.1, but can anyone tell if this is or was a problem. I can only get nlm (nonlinear minimization) to adjust the first three components of function variable. No gradient or hessian is supplied. E.G.; fnoise function(y) { y[5]/(y[4]*sp2) * exp(-((x[,3]-y[1]-y[2]*x[,1]-y[3] *x[,2])/y[4])^2/2) + (1-y[5])/(y[9]*sp2) * exp(-((x[,3]-y[6]-y[7]*x[,1]-y[8] *x[,2])/y[9])^2/2) } nlm(sum(-log(fnoise(y))),c(5,1,1,10,.75,1,.2,.2,6),hessian=TRUE,print.level=2)) Thanks, Bob