The results are very sensitive in some cases to configuration (tolerances,
etc.) and problem.
Are you using the "follow-on" option? That will definitely be order dependent.
optimx is currently under review by Ravi Varadhan and I. Updating optimx proved
very difficult
because of interactions bet
Dear R-er,
For a non-linear optimisation, I used optim() with BFGS method but it
stopped regularly before to reach a true mimimum. It was not a problem
with limit of iterations, just a local minimum. I was able sometimes to
reach better minimum using several rounds of optim().
Then I moved t
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