On Tue, Jul 8, 2008 at 11:28 AM, Kanak Choudhury <[EMAIL PROTECTED]> wrote: > i have a function like > > 1+sin(a+bx) where -pi/2<=a+bx<=pi/2 > > i made a progrom using constrOptim() function but it is not giving good > result. it depends on the initial value. but when i am doing simulation it > is impossible of find the best initial value for every step. also i am not > exactly sure how to input the restriction though i have read the help file > of the function. here x is a set of values. would u please send me some > instruction to find the best result from the obtimization.
Actually, there is no need to use R to optimize such a function. In truth, the analytical solution for your problem, in case you are wanting to maximize, is: a + b x = pi/2; in case of minimization, the solution is: a + b x = - pi/2. Paul ______________________________________________ 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.
