In 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 how to set values of 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 |