Kathie,
It is very difficult to help without adequate information. What does your
objective function look like? Are you maximizing (in which case you have to
make sure that the sign of the objective function is correct) or minimizing?
Can you try "optimx" with the control option all.methods=TR
00 (PDT)
> From: Kathie To: r-help@r-project.org Subject:
> [R]
> optimization problems Message-ID: <1313223129383-3741005.p...@n4.nabble.com>
> Content-Type:
> text/plain; charset=us-ascii Dear R users I am trying to use OPTIMX(OPTIM)
> for nonlinear
> optimization. Th
To be honest,
The first derivative of my objective function is very complicated so I
ignore this. Could it lead to this sort of problem?
Kathie
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Dear R users
I am trying to use OPTIMX(OPTIM) for nonlinear optimization.
There is no error in my code but the results are so weird (see below).
When I ran via OPTIM, the results are that
Initial values are that theta0 = 0.6 1.6 0.6 1.6 0.7. (In fact true vales
are 0.5,1.0,0.8,1.2, 0.6.)
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