ampl: option donlp2_options 'epsx=1e-6 maxit=100';
maxfwd max vars in fwd AD of common exprs (default 5)
tau0 sum of constraint violations allowed during iteration (default 1.d0)
del0 initially an inequality g is binding if g/max{1,||grad g||}<=del0 (default 1.d0)
epsx required precision in primal solution (default 0.00001)
maxit iteration limit (<= 4000)
nreset allowed number of successive steps with insignificant changes in x or f
intakt write iteration protocol also to stdout =0 off (default) =1 on
silent write results and messages on special events to file *.pro and *.mes (default =1: no)
outlev composed from 4 bits:
bit 1 ="0" means no output , "1" one line per step,
bit 2 ="1" short iteration protocol
bit 3 ="1" detailed iteration protocol (primal and dual sol's, stepsizes etc.)
bit 4 ="1" print also gradients and hessian estimate
prou unit number for output protocol
meu unit number for special events messages protocol
wantsol solution report without -AMPL: sum of
1 ==> write .sol file
2 ==> print primal variable values
4 ==> print dual variable values
8 ==> do not print solution message
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