| set_rh_rangeSet the range on a constraint. unsigned char set_rh_range(lprec *lp, int row, REAL deltavalue); Return Value set_rh_range returns TRUE (1) if the operation was successful. A return
						value of FALSE (0) indicates an error.
 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 row The row number of the constraint on which the range must be set.
						It must be between 1 and the number of rows in the lp. deltavalue The range on the constraint. Remarks The set_rh_range function sets a range on the constraint (row) identified
						by row.Setting a range on a row is the way to go instead of adding an extra constraint
						(row) to the model. Setting a range doesn't increase the model size that means
						that the model stays smaller and will be solved faster.
 If the row has a less than constraint then the range means setting a minimum on
						the constraint that is equal to the RHS value minus the range. If the row has a
						greater than constraint then the range means setting a maximum on the
						constraint that is equal to the RHS value plus the range.
 Note that the range value is the difference value and not the absolute value.
 Example #include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"
int main(void)
{
  lprec *lp;
  /* Create a new LP model */
  lp = make_lp(1, 1);
  if(lp == NULL) {
    fprintf(stderr, "Unable to create new LP model\n");
    return(1);
  }
  set_rh_range(lp, 1, 1.0);
  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_rh_range |