inst/HiGHS/docs/src/guide/advanced.md

In highs: 'HiGHS' Optimization Solver

Advanced features

Simplex tableau data

HiGHS has a suite of methods for operations with the invertible representation of the current basis matrix B. To use these requires knowledge of the corresponding (ordered) basic variables. This is obtained using the method getBasicVariables , with non-negative values being columns and negative values corresponding to row indices plus one [so -1 indicates row 0]. Methods getBasisInverseRow and getBasisInverseCol yield a specific row or column of B^{-1}. Methods getBasisSolve and getBasisTransposeSolve yield the solution of Bx=b and Bx=b respectively. Finally, the methods getReducedRow and getReducedColumn yield a specific row or column of B^{-1}A. In all cases, HiGHS can return the number and indices of the nonzeros in the result.

highs documentation built on April 4, 2025, 3:23 a.m.