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integer and
is the primary key for the data table.
Its initial value is zero, and it increments by one for each row.
Note that all the variables and constraints have been re-scaled by
dismod_at and cppad_mixed before ipopt even sees the problem.
integer and
is the current iteration count (which is equal to
trace_fixed_id
).
This includes regular iterations and iterations during the restoration phase.
real and
is the objective value at the current point.
real and
is the constraint violation at the current point.
This quantity is the infinity-norm (max) of the constraint
violation for @(@
g(x)
@)@ in the Ipopt documentation.
During the restoration phase, this value remains the constraint
violation of the original problem at the current point.
The option inf_pr_output can be used to switch to the printing of
a different quantity.
real and
is the dual infeasibility at the current point.
This quantity measure the infinity-norm (max) of the
internal dual infeasibility, i.e, the derivative of the lagrangian
with respect to the primal variables
@[@
\nabla f(x) \nabla c(x) \lambda - z
@]@
where @(@
z
@)@ are the lagrange multipliers for the box constraints and
@(@
c(x)
@)@ are the nonlinear equality constraints
(inequality constraints are reformulated using slack variables
and problem scaling).
During the restoration phase,
this is the value of the dual infeasibility for the restoration phase problem.
real and
is the value of the barrier parameter @(@
\mu
@)@.
real and
is the infinity norm (max) of the primal step
(for the original variables @(@
x
@)@ and the internal slack
variables @(@
s
@)@).
During the restoration phase,
this value includes the values of additional variables that
capture the violation in @(@
c(x) = 0
@)@.
real and
is the value of the regularization term for the Hessian
of the Lagrangian in the augmented system.
real and
is the step size for the dual variables for the box constraints in the
equality constrained formulation; i.e., @(@
z
@)@.
real and
is the step size for the primal variables
@(@
x
@)@ and @(@
\lambda
@)@ in the equality constrained formulation.
The number is usually followed by a character for additional diagnostic
information regarding the step acceptance criterion.
integer and
is the number of backtracking line search steps
(does not include second-order correction steps).
integer is zero or one.
If it is one (zero), this is a restoration iteration
(is not a restoration iteration).