gams:formulate_logical_expressions_in_equations

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gams:formulate_logical_expressions_in_equations [2008/09/25 17:00] support |
gams:formulate_logical_expressions_in_equations [2009/03/05 17:18] support |
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====== How do I formulate logical expressions in equations? ====== | ====== How do I formulate logical expressions in equations? ====== | ||

- | GAMS does not reformulate logical expressions. You need to do this by hand. If you need help coming up with the right model you should try to read HP Willams Book on Modeling (http://www.amazon.com/Model-Building-Mathematical-Programming-4th/dp/0471997889). It explains how to use the ''bigM'' method to linearize logical constraints. | + | GAMS does not reformulate logical expressions. You need to do this by hand. If you need help coming up with the right model you should try to read HP Williams Book on Modeling (http://www.amazon.com/Model-Building-Mathematical-Programming-4th/dp/0471997889). It explains how to use the ''bigM'' method to linearize logical constraints. |

For example, if you have a logical expression ''i=1 <=> a > b'' then you can reformulate this as | For example, if you have a logical expression ''i=1 <=> a > b'' then you can reformulate this as |

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gams/formulate_logical_expressions_in_equations.txt ยท Last modified: 2013/08/05 10:00 by support