GAMS — The Solver Manuals - Available Software

180 CPLEX 11
baritlim (integer)
Determines the maximum number of iterations for the barrier algorithm. When set to 0, no Barrier iterations
occur, but problem setup occurs and information about the setup is displayed (such as Cholesky factorization
information). When left at the default value, there is no explicit limit on the number of iterations.
(default = large)
barmaxcor (integer)
Specifies the maximum number of centering corrections that should be done on each iteration. Larger values
may improve the numerical performance of the barrier algorithm at the expense of computation time. The
default of -1 means the number is automatically determined.
(default = -1)
barobjrng (real)
Determines the maximum absolute value of the objective function. The barrier algorithm looks at this limit
to detect unbounded problems.
(default = 1e+020)
barorder (integer)
Determines the ordering algorithm to be used by the barrier method. By default, Cplex attempts to choose
the most effective of the available alternatives. Higher numbers tend to favor better orderings at the expense
of longer ordering runtimes.
(default = 0)
0 Automatic
1 Approximate Minimum Degree (AMD)
2 Approximate Minimum Fill (AMF)
3 Nested Dissection (ND)
barqcpepcomp (real)
Range: [1e-012,1e+075]
(default = 1e-007)
barstartalg (integer)
This option sets the algorithm to be used to compute the initial starting point for the barrier solver. The
default starting point is satisfactory for most problems. Since the default starting point is tuned for primal
problems, using the other starting points may be worthwhile in conjunction with the predual parameter.
(default = 1)
1 default primal, dual is 0
2 default primal, estimate dual
3 primal average, dual is 0
4 primal average, estimate dual
bbinterval (integer)
Set interval for selecting a best bound node when doing a best estimate search. Active only when nodesel is
2 (best estimate). Decreasing this interval may be useful when best estimate is finding good solutions but
making little progress in moving the bound. Increasing this interval may help when the best estimate node
selection is not finding any good integer solutions. Setting the interval to 1 is equivalent to setting nodesel
to 1.
(default = 7)