CPLEX Changelog#
20250424#
Changes in MP
Option cvt:qp2pass (default even faster parsing of quadratics)
Compatibility updates
Option netopt accepts numeric argument. For keyword-only, use option alg:network. Note the new default (compared to cplexasl): netopt=0.
Options netdisplay, netfeasibility, netfind, netoptimality, and netpricing
Options primal, dual (both dummy)
Fixed output logging incl. options mipdisplay, mipinterval, lpdisplay, bardisplay, modisplay, netdisplay
20250329#
Changes in MP:
Option cvt:multoutcard to limit the size of out-multiplied QP expressions. Can improve speed on large models.
Improved parsing of quadratic expressions.
20250308#
Changes in MP.
20241212#
Releasing with CPLEX version 22.1.2
20241206#
Added support for sensitivity analysis (keyword
sensitivity
)Added keywords
mip:nodefile
,tech:workdir
,tech:workfilelim
20240828#
Options
primalopt
,dualopt
,baropt
,siftopt
,netopt
,bendersopt
are now flags (e.g. they have to be set without a value)
20240823#
CPLEX MP driver is now the default. To use the previous ASL-based driver set:
option solver cplexasl;
Added many options available in the ASL driver
Notable changes with ASL driver:
Keyword ‘basis_cond’ is now ‘kappa’ and follows the standard MP implementation
Multiobjective optimization follows the MP standard implementation
Choosing solution algorithm for the LP problems or the initial MIP subproblem (formerly
mipstartalg
) now follows the same standard as other MP drivers: seealg:method
in the-=
outputFormer option
timing
is now implemented through the corresponding MP feature. To print the number of available cores usetech:numcores
.Use MP feature
tech:writemodelonly
instead ofwriteprob
+nosolve
. Note thatnosolve
still applies when specifyingwritemipstart
Conversion of basis status for constraints depending on sense
20240801#
Fix a problem that occured when reporting IIS
Removed some noise from console output
20240724#
Option acc:_all
Useful to disable all reformulations (acc:_all=2), or force linearization (acc:_all=0).
Option cvt:prod
Controls reformulation of binary products into logical constraints.
Faster input of quadratic expressions.
20240617#
Multi-objective emulator
obj:multi=2 forces emulation, even if MO natively supported.
Fixed a bug in the objective degradation suffixes .objasbtol, .objreltol.
20240604#
Presolve division by constant, resulting in fewer constraints
Fix no-solution case in multi-objective emulator
20240529#
Multi-objective emulator
All flat MP solvers support multi-objective mode (obj:multi=1), either natively, or via emulation.
Suffixes .objpriority, .objweight, .objabstol, .objreltol.
[BREAKING] Default intuitive handling of .objweight, see option obj:multi:weight, even when natively supported.
20240429#
[BREAKING] Merged
report_times
andtiming
; they are now aliases, set the value to 1 to have basic info, to 2 to have more detailed info.
20240320#
SOS constraints.
Fixed handling of SOS2 constraints created by AMPL as reformulations of PL expressions (
option pl_linearize 1
, default; set to 0 to use the solver’s native PL functions or MP linearization.)Disallow repeated weights for SOS constraints (suffixes
.sosno
/.ref
.)
Option
report_times
Unused
acc:
options.The constraint acceptance options
acc:...
for non-handled constraints are ignored (previously triggered error.)
20240115#
Solve result codes.
List codes by running (solver) -!
[BREAKING] Standardized codes. Major changes:
100-199 (solved?) means solution candidate provided, but can be suboptimal/infeasible
300-349 means unbounded problem but feasible solution returned
400-449 means limit/interrupt but feasible
[BREAKING] sol:chk:fail returns code 150 (solved?)
Improved translation of SOCP constraints.
Options cvt:socp, cvt:socp2qc.
Compact solution check warnings
Fixed presolve of the power function #226.
Added fixed model for
mip:basis
Added options:
alg:method
and flags to choose the solution algorithmmip:nodemethod
to choose the algorithm used for MIP node problemslp:solutiontype
to choose if to use crossover to get a basis basis solution after barrier
20231122#
Public beta; implemented most features in MP: model export, warm start, input and output basis, feasibility relaxation, multiple solutions, kappa, unbounded rays, IIS, return MIP gap, return dual bound
Native Model support:
continuous and integer variables
multiple objectives, quadratic objectives
linear and quadratic constraints, indicator constraints and PL functions
special ordered sets (type 1 and 2)
20231117#
MP update: fixed graceful exit on Ctrl-C from AMPL in Linux and fixed issue with reading text-format NL files
20230815#
Fixed a bug causing repeated names for auxiliary variables and constraints.
Option values can be assigned without ‘=’.
Changed default tolerance for strict comparisons to 0 (option cmp:eps, #102.)
Fixed a bug where equivalent conditional comparisons were not unified.