get_upbo

Gets the upper bound of a variable.

REAL get_upbo(lprec *lp, int column);

Return Value

get_upbo returns the upper bound on the specified variable. If no bound was set, it returns 1e24, the default upper bound.

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

column

The column number of the variable. It must be between 1 and the number of columns in the lp.

Remarks

The get_upbo function returns the upper bound on the variable identified by column.
Setting a bound on a variable is the way to go instead of adding an extra constraint (row) to the model. Setting a bound doesn't increase the model size that means that the model stays smaller and will be solved faster.
The default upper bound of a variable is infinity (well not quite. It is 1e24).

Example

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

int main(void)
{
  lprec *lp;
  REAL a;

  /* Create a new LP model */
  lp = make_lp(0, 2);
  if(lp == NULL) {
    fprintf(stderr, "Unable to create new LP model\n");
    return(1);
  }

  a = get_upbo(lp, 1); /* will return 1e24 since no upper bound was set */

  delete_lp(lp);
  return(0);
}

lp_solve API reference