Module ojalgo
Package org.ojalgo.optimisation.linear

Class RevisedStore

    • Field Detail

      • a

        private final PhysicalStore<java.lang.Double> a
        Pivot row for dual simplex. Contains coefficients of non-basic variables in the tableau row for the exiting basic variable. Updated incrementally with each dual simplex iteration.

      • d

        private final R064Store d
        Reduced costs for non-basic variables. Shows objective change per unit increase in a non-basic variable. Updated incrementally with each iteration and pivot.

      • l

        private final R064Store l
        Dual variables (Lagrange multipliers) for constraints. Computed as π = B^(-T) * c_B. Updated as needed for reporting or solution extraction.

      • myBasis

        private final MatrixStore<java.lang.Double> myBasis
        Current basis matrix B (columns of constraint matrix for basic variables). Not explicitly stored; computed from constraint matrix and current basis indices. Updated when the basis changes.

      • myConstraintsBody

        private final ColumnsSupplier<java.lang.Double> myConstraintsBody
        Complete constraint matrix A (all variables). Static during solve. Used for column access and basis updates.

      • myConstraintsRHS

        private final R064Store myConstraintsRHS
        Right-hand side vector b of Ax = b. Updated when bounds are shifted. Used to compute the current basic solution.

      • myInvBasis

        private final BasisRepresentation myInvBasis
        Inverse of the current basis matrix B^(-1). Maintained and updated using factorization techniques. Updated when the basis changes or is reset.

      • myObjective

        private final R064Store myObjective
        Objective function coefficients c for all variables. Static during solve. Used to compute duals and objective value.

      • myPhase1Objective

        private R064Store myPhase1Objective
        Phase-1 objective function (sum of artificial variables). Used only during phase-1. Created and set up at the start of phase-1, and set to null after phase-1.

      • r

        private final R064Store r
        Temporary storage for reduced cost calculations. Used as intermediate storage during iterations and dual variable updates.

      • x

        private final R064Store x
        Current basic solution x_B. Values of basic variables in the current iteration. Updated incrementally with each iteration and pivot.

      • y

        private final R064Store y
        Direction vector for entering variable in primal simplex. Shows how basic variables change when entering variable increases. Updated incrementally with each iteration.

      • z

        private final R064Store z
        Temporary storage vector for various computations, especially rows of the inverse basis matrix. Reused to avoid memory allocation. Updated as needed for intermediate calculations.

    • Constructor Detail

      • RevisedStore

        RevisedStore​(int mm,
             int nn)