# set_mip_gap Specifies the MIP gap value. void set_mip_gap(lprec *lp, unsigned char absolute, REAL mip_gap); Return Value set_mip_gap has no return value. Parameters lp 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 absolute If TRUE then the absolute MIP gap is set, else the relative MIP gap mip_gap The MIP gap. Remarks The set_mip_gap function sets the MIP gap that specifies a tolerance for the branch and bound algorithm. This tolerance is the difference between the best-found solution yet and the current solution. If the difference is smaller than this tolerance then the solution (and all the sub-solutions) is rejected. This can result in faster solving times, but results in a solution which is not the perfect solution. So be careful with this tolerance. The default mip_gap value is 1e-11 Example
    #include <stdio.h>
    #include <stdlib.h>
    #include "lp_lib.h"

    int main(void)
    {
      lprec *lp;

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

      set_mip_gap(lp, TRUE, 1.0e-8); /* sets absolute mip_gap to 1e-8 */

      delete_lp(lp);
      return(0);
    }
lp_solve API reference See Also make_lp, copy_lp, read_lp, read_LP, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI, get_mip_gap, get_epsd, set_epsd, set_infinite, get_infinite, is_infinite, set_epsint, get_epsint, set_epsb, get_epsb, set_epsel, get_epsel, get_epspivot, set_epspivot, set_epsperturb, get_epsperturb