Displaying 2 results from an estimated 2 matches for "funcrion".
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funcion
2006 Feb 06
1
Periodic B-spline surface
Hi..,
is there any funcrion in R to fit a periodic B-spline Surface
Harsh
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2004 Apr 02
0
Hessian in constrOptim
Dear R-users,
In the function constrOptim there is an option to get an approximation
to the hessian of the surrogate function R at MLE by declaring
hessian=TRUE in the calls to the function optim. I would like to ask
if it is advisable to get an approximate hessian for the funcrion f as
follows:
f''(theta)=R''(theta|theta_k)-B''(theta)
where B''(theta)=mu*sum((g(theta_k)/g(theta)^2)u_i*u_i^T) denotes the
second derivative of the barrier function
(following the notation given by Lange (1999)) where
R''(theta|theta_k) will be replaced...