set_epsd

Specifies the value that is used as a tolerance for reduced costs to determine whether a value should be considered as 0.

void set_epsd(lprec *lp, REAL epsd);

Return Value

set_epsd has no return value.

Parameters

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

epsd

The value that is used as a tolerance for reduced costs to determine whether a value should be considered as 0.

Remarks

The set_epsd function specifies the value that is used as a tolerance for reduced costs to determine whether a value should be considered as 0.
Floating-point calculations always result in loss of precision and rounding errors. Therefore a very small value (example 1e-99) could be the result of such errors and should be considered as 0 for the algorithm. epsd specifies the tolerance to determine if a reducedcost value should be considered as 0. If abs(value) is less than this epsd value, it is considered as 0.
The default epsd value is 1e-9

Example

#include <stdio.h>
#include <stdlib.h>
#include "lpkit.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_epsd(lp, 1.0e-8); /* sets epsd to 1e-8 */

  delete_lp(lp);
  return(0);
}

lp_solve API reference