Comparisons in optimizer constraints

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Allister Wilson asked Jun 22, '16 Phil BoBo answered Jun 22, '16

Comparisons in optimizer constraints

I'm having issues getting comparison operators to behave in optimizer constraints.

For example, the following :

Images intégrées 1

...doesn't reject solutions where the values are equal :

One of our clients wanted a working equivalent to a != b, which I think should be "a<b or a>b" in an optimizer constraint. In the end the best working solution I could give him was abs([a] - [b]) >= 1.

optquest-constraints.fsm

Software Version:

FlexSim 16.0.1

optquest constraints

optimizer-constraints.png (16.7 KiB)

optquest-constraints.fsm (65.7 KiB)

Answer 1 · 2016-06-22T15:57:12Z

Phil BoBo answered Jun 22, '16

OptQuest constraints can only support greater-than-or-equal, less-than-or-equal, or exactly equal. If you use less-than or greater-than, it treats it as less-than-or-equal or greater-than-or-equal. http://www.opttek.com/documentation/v64engine/OptQuest%20Engine%20Documentation/WebHelp/Defining_constraints.htm

I will add a note to the development list to update the OptQuest documentation accordingly.

You can adjust your constraint equation by a small value in order to get the results you are looking for:

[Variable 1] <= [Variable 2] - 0.01

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