ILOG CPLEX 11.0 Parameters Reference Manual > > Alphabetic List of Parameters > Relaxation for feasOpt |
Relaxation for feasOpt |
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C Name
CPX_PARAM_EPRELAX
C++ Name
EpRelax
Java Name
EpRelax
.NET Name
EpRelax
InteractiveOptimizer
feasopt tolerance
Identifier
2073
Description
Controls the amount of relaxation for the routine CPXfeasopt
in the C API or for the method feasOpt
in the object-oriented APIs.
In the case of a MIP, it serves the purpose of the absolute gap for the feasOpt
model in Phase I (the phase to minimize relaxation).
Using this parameter, you can implement other stopping criteria as well. To do so, first call feasOpt
with the stopping criteria that you prefer; then set this parameter to the resulting objective of the Phase I model; unset the other stopping criteria, and call feasOpt
again. Since the solution from the first call already matches this parameter, Phase I will terminate immediately in this second call to feasOpt
, and Phase II will start.
In the case of an LP, this parameter controls the lower objective limit for Phase I of feasOpt
and is thus relevant only when the primal optimizer is in use.
Values
Any nonnegative value; default: 1e-6.
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