The members of the fundamental HiGHS enums are defined below. If Enum
refers to a particular enum, and Member
to a particular member, the members are available as follows.
- Python: highspy.
Enum
.Member
- C++:
Enum
::Member
Members for internal use only are not documented.
HighsStatus
This is (part of) the return value of most HiGHS methods
- kError: The method has exposed an error
- kOk: The method has completed successfully
- kWarning: The method has recovered from an unusual event, or has terminated due to reaching a time or iteration limit
MatrixFormat
This defines the format of a HighsSparseMatrix
- kColwise: The matrix is stored column-wise
- kRowwise: The matrix is stored row-wise
ObjSense
This defines optimization sense of a HighsLp
- kMinimize: The objective is to be minimized
- kMaximize: The objective is to be maximized
HighsVarType
This defines the feasible values of a variable within a model
- kContinuous: The variable can take continuous values between its bounds
- kInteger: The variable must take integer values between its bounds
- kSemiContinuous: The variable must be zero or take continuous values between its bounds
- kSemiInteger: The variable must be zero or take integer values between its bounds
SolutionStatus
This defines the nature of any primal or dual solution information
- kSolutionStatusNone: There is no solution information
- kSolutionStatusInfeasible: The solution is not feasible
- kSolutionStatusFeasible: The solution is feasible
BasisValidity
This defines the nature of any basis information
- kBasisValidityInvalid: There is no basisn information
- kBasisValidityValid: The basis information is valid
HighsModelStatus
This defines the status of the model after a call to run
- kNotset: The model status has not been set
- kModelError: There is an error in the model
- kSolveError: There has been an error when solving the model
- kModelEmpty: The model is empty
- kOptimal: The model has been solved to optimality
- kInfeasible: The model is infeasible
- kUnboundedOrInfeasible: The model is unbounded or infeasible
- kUnbounded: The model is unbounded
- kObjectiveBound: The bound on the model objective value has been reached
- kObjectiveTarget: The target value for the model objective has been reached
- kTimeLimit: The run time limit has been reached
- kIterationLimit: The iteration limit has been reached
- kSolutionLimit: The MIP solver has reached the limit on the number of LPs solved
- kUnknown: The model status is unknown
HighsBasisStatus
This defines the status of a variable (or slack variable for a constraint) in a basis
- kLower: The variable is nonbasic at its lower bound (or fixed value)
- kBasic: The variable is basic
- kUpper: The variable is at its upper bound
- kZero: A free variable is nonbasic and set to zero
- kNonbasic: The variable is nonbasic
HighsOptionType
This defines the types of option values that control HiGHS
- kBool: The option type is boolean
- kInt: The option type is integer
- kDouble: The option type is double
- kString: The option type is string
HighsInfoType
This defines the types of (scalar) information available after a call to run()
- kInt64: The information type is 64-bit integer
- kInt: The information type is integer
- kDouble: The information type is double