When preparing your diagrams for constrained optimization, remember that every time a parameterUnknown block or a globalConstraint block is pasted into a diagram, the upper bound is set to 1.e30 and the lower bound is set to -1.e30. This means that unless you reset these bounds, the decision variable (or constraint) is unconstrained.
The following conventions are used to set the upper and lower bounds:
•1.e30 represents infinity (+∞)
•-1.e30 represents minus infinity (-∞)
The table below shows expected values for the upper and lower bounds:
|
Bound Type |
Math |
Lower bound |
Upper bound |
|
Free (no bounds) |
( - ∞, + ∞) |
-1.e30 |
1.e30 |
|
Lower bound only |
[ a, + ∞) |
a |
1.e30 |
|
Upper bound only |
( - ∞, a ] |
-1.e30 |
a |
|
Lower and upper bound |
[ a, b ] |
a |
b |
|
Equality |
[ a, a ] |
a |
a |