class TQpLinSolverBase: public TObject

 Default constructor

 Constructor

 Copy constructor

 Sets up the matrix for the main linear system in "augmented system" form. The
 actual factorization is performed by a routine specific to either the sparse
 or dense case

 Computes the diagonal matrices in the augmented system from the current set of variables

 Solves the system for a given set of residuals. Assembles the right-hand side appropriate
 to the matrix factored in factor, solves the system using the factorization produced there,
 partitions the solution vector into step components, then recovers the step components
 eliminated during the block elimination that produced the augmented system form .

 Assemble right-hand side of augmented system and call SolveCompressed to solve it

 Assembles a single vector object from three given vectors .
     rhs_out (output) final joined vector
     rhs1_in (input) first part of rhs
     rhs2_in (input) middle part of rhs
     rhs3_in (input) last part of rhs .

 Extracts three component vectors from a given aggregated vector.
     vars_in  (input) aggregated vector
     x_in (output) first part of vars
     y_in (output) middle part of vars
     z_in (output) last part of vars

 Assignment opeartor

 assemble right-hand side of augmented system and call
 SolveCompressed to solve it

 perform the actual solve using the factors produced in
 factor.
  rhs on input contains the aggregated right-hand side of
  the augmented system; on output contains the solution in
  aggregated form

 places the diagonal resulting from the bounds on x into
 the augmented system matrix