The OBJECT BOUND indicator card is used to announce known lower and upper bounds on the value of the objective function for the problem. The syntax for data following this indicator card is given in Figure 3.20.
The two-character string in data field 1 specifies the type of bound to be input. Possible values are: LO, XL or ZL for a lower bound, and UP, XU or ZU for an upper bound. The string obbnd-name in data field 2 gives a name to the bounds under consideration. This name may be up to ten characters long. Several different known bounds on the objective function may be defined in the OBJECT BOUND section.
For bounds of type LO or UP, the numerical value of the bound is given as the string numerical-vl using at most 12 characters in data field 4. For bounds of type ZL or ZU, the numerical value of the bound is that previously associated with the real parameter array r-p-a-name specified in field 5. When both lower and upper bounds on the objective are known, they must be specified on separate cards.
The objective function is assumed by default to be unbounded both below and above. The values for each named bound set may only be changed on a LO, UP, XL, XU, ZL or ZU card.