Hi,
On Sep 7, 2007, at 11:00 PM, Yuchen Luo wrote:
constrOptim(c(0.5,0.3,0.5), fit.error, fit.error.grr,
ui=-1*ui,ci=-1*ci)
and I am confronted with error message initial value not feasible
I plug in the initial value of (0.5,0.3,0.5) to function fit.error and
fit.error.grr and have pretty reasonable result.
That doesn't mean the constraint is satisfied, which depends on the
values of ui and ci
but they are not provided so it's hard to tell where the problem is.
hth, Ingmar
I inequality ui %*% theta
- ci = 0 as suggested in the R manual and it is satisfied. In
case that
this is a typo of the manual, I let ui=-ui and ci=-ci and try
constrOptim
again but the same warning message pops up.
Could you please point me a way out of this?
I am actually trying to translate a fortran code to R and the
function I
want to replace is DBCPOL, which used 'the complex method
described in
Nelder and Mead (1965) and Gill et al. (1981). I believe contrOptim is
better than it because it is newer, is it?
Best Wishes
Yuchen Luo
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