Arguments
npt
The number of points used to approximate the objective function via
a quadratic approximation. The value of npt must be in the interval
$[n+2,(n+1)(n+2)/2]$ where
$n$
is the number of parameters in par. Choices that exceed
$2*n+1$
rhobeg
rhobeg and rhoend
must be set to the initial and final values of a trust
region radius, so both must be positive with
0 < rhoend < rhobeg. Typically
rhobeg should be about one tenth of th
rhoend
The smallest value of the
trust region radius that is allowed. If not defined, then
1e-6 times the value set for rhobeg will be used.
iprint
The value of iprint should be set to 0, 1, 2 or 3,
which controls the
amount of printing. Specifically, there is no output if iprint=0 and
there is output only at the return if iprint=1. Other
maxfun
The maximum allowed number of function evaluations. If this is exceeded, the
method will terminate.
obstop
Set TRUE if out of bounds parameters force program to stop. Otherwise
parameters are reset to nearest bound.
force.start
Powell tries to move parameters at least rhobeg from the nearest
bound. This is the default action (force.start=FALSE). When
TRUE, use user supplied start regardless.