get_max_num_inv

Returns the maximum number of pivots between a re-inversion of the matrix.

int get_max_num_inv(lprec *lp);

Return Value

get_max_num_inv returns the maximum number of pivots between a re-inversion of the matrix.

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

Remarks

The get_max_num_inv function returns the maximum number of pivots between a re-inversion of the matrix.
For stability reasons, lp_solve re-inverts the matrix on regular times. max_num_inv determines how frequently this inversion is done. This can influence numerical stability. However, the more often this is done, the slower the solver becomes.
The default is 30.

Example

#include <stdio.h>
#include <stdlib.h>
#include "lpkit.h"

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

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

  max_num_inv = get_max_num_inv(lp); /* Will return 30 */

  delete_lp(lp);
  return(0);
}

lp_solve API reference