get_maxpivot

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

int get_maxpivot(lprec *lp);

Return Value

get_maxpivot 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, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI

Remarks

The get_maxpivot 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 250 for the LUSOL bfp and 42 for the other BFPs.

Example

#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.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_maxpivot(lp);

  delete_lp(lp);
  return(0);
}

lp_solve API reference