Manipulating a basis

These routines manipulate a basis of a problem.

CPXXbinvacol and CPXbinvacol
The routine CPXXbinvacol/CPXbinvacol computes the representation of the j-th column in terms of the basis.
CPXXbinvarow and CPXbinvarow
The routine CPXXbinvarow/CPXbinvarow computes the i-th row of BinvA where Binv represents the inverse of the matrix B and juxtaposition specifies matrix multiplication.
CPXXbinvcol and CPXbinvcol
The routine CPXXbinvcol/CPXbinvcol computes the j-th column of the basis inverse.
CPXXbinvrow and CPXbinvrow
The routine CPXXbinvrow/CPXbinvrow computes the i-th row of the basis inverse.
CPXXbtran and CPXbtran
The routine CPXXbtran/CPXbtran solves xTB = yT and puts the answer in y.
CPXXcopybase and CPXcopybase
The routine CPXXcopybase/CPXcopybase copies a basis into a CPLEX problem object.
CPXXcopybasednorms and CPXcopybasednorms
The routine CPXXcopybasednorms/CPXcopybasednorms works in conjunction with the routine CPXXgetbasednorms/CPXgetbasednorms.
CPXXcopydnorms and CPXcopydnorms
The routine CPXXcopydnorms/CPXcopydnorms copies the dual steepest-edge norms to the specified LP problem object.
CPXXcopyprotected and CPXcopyprotected
The routine CPXXcopyprotected/CPXcopyprotected specifies a set of variables that should not be substituted out of the problem.
CPXXftran and CPXftran
The routine CPXXftran/CPXftran solves By = x and puts the answer in the vector x, where B is the basis matrix.
CPXXgetbase and CPXgetbase
The routine CPXXgetbase/CPXgetbase accesses the basis resident in a CPLEX problem object.
CPXXgetbasednorms and CPXgetbasednorms
The routine CPXXgetbasednorms/CPXgetbasednorms works in conjunction with the routine CPXXcopybasednorms/CPXcopybasednorms.
CPXXgetbhead and CPXgetbhead
The routine CPXXgetbhead/CPXgetbhead returns the basis header; it gives the negative value minus one of all row indices of slacks.
CPXXgetdnorms and CPXgetdnorms
The routine CPXXgetdnorms/CPXgetdnorms accesses the norms from the dual steepest edge.
CPXXgetijrow and CPXgetijrow
The routine CPXXgetijrow/CPXgetijrow returns the index of a specific basic variable as its position in the basis header.
CPXXkilldnorms and CPXkilldnorms
The routine CPXXkilldnorms/CPXkilldnorms deletes any dual steepest-edge norms that have been retained relative to an active basis.
CPXXkillpnorms and CPXkillpnorms
The routine CPXXkillpnorms/CPXkillpnorms deletes any primal steepest-edge norms that have been retained relative to an active basis.
CPXXmbasewrite and CPXmbasewrite
The routine CPXXmbasewrite/CPXmbasewrite writes the most current basis associated with a CPLEX problem object to a file.
CPXXmdleave and CPXmdleave
The routine CPXXmdleave/CPXmdleave assumes that there is a resident optimal simplex basis, and a resident LU-factorization associated with this basis.
CPXXNETextract and CPXNETextract
The routine CPXXNETextract/CPXNETextract finds an embedded network in the LP stored in a CPLEX problem object and copies it as a network to the network problem object, net.
CPXXpivot and CPXpivot
The routine CPXXpivot/CPXpivot performs a basis change where variable jenter replaces variable jleave in the basis.
CPXXpivotin and CPXpivotin
The routine CPXXpivotin/CPXpivotin forcibly pivots slacks that appear on a list of inequality rows into the basis.
CPXXpivotout and CPXpivotout
The routine CPXXpivotout/CPXpivotout pivots a list of fixed variables out of the resident basis.
CPXXreadcopybase and CPXreadcopybase
The routine CPXXreadcopybase/CPXreadcopybase reads a basis from a BAS file, and copies that basis into a CPLEX problem object.

Parent topic: Simplex Optimizers in the CPLEX Callable Library (C API) Reference Manual