get_anti_degen

Returns the used degeneracy rule.

int get_anti_degen(lprec *lp);

Return Value

get_anti_degen returns the used degeneracy rule. Can be a combination of any of the following values:

ANTIDEGEN_NONE (0)	No anti-degeneracy handling
ANTIDEGEN_FIXEDVARS (1)	Check if there are equality slacks in the basis and try to drive them out in order to reduce chance of degeneracy in Phase 1
ANTIDEGEN_COLUMNCHECK (2)
ANTIDEGEN_STALLING (4)
ANTIDEGEN_NUMFAILURE (8)
ANTIDEGEN_LOSTFEAS (16)
ANTIDEGEN_INFEASIBLE (32)
ANTIDEGEN_DYNAMIC (64)
ANTIDEGEN_DURINGBB (128)
ANTIDEGEN_RHSPERTURB (256)	Perturbation of the working RHS at refactorization
ANTIDEGEN_BOUNDFLIP (512)	Limit bound flips that can sometimes contribute to degeneracy in some models

Parameters

Pointer to previously created lp model. See return value of make_lp, copy_lp, read_lp, read_LP, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI

Remarks

The get_anti_degen function returns the used degeneracy rule.
The default is ANTIDEGEN_INFEASIBLE + ANTIDEGEN_STALLING + ANTIDEGEN_FIXEDVARS (37)

Example

#include
#include <stdlib.h>
#include "lp_lib.h"

int main(void)
{
  lprec *lp;
  int anti_degen;

  /* Create a new LP model */
  lp = make_lp(0, 0);
  if(lp == NULL) {
    fprintf(stderr, "Unable to create new LP model\n");
    return(1);
  }
  anti_degen= get_anti_degen(lp);

  delete_lp(lp);
  return(0);
}

lp_solve API reference