gams:formulate_a_constraint_with_a_condition

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gams:formulate_a_constraint_with_a_condition [2010/07/19 14:36] support |
gams:formulate_a_constraint_with_a_condition [2010/07/19 14:50] (current) support |
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min x, subject to x > 0 ? Is it 1.e-10 or 1.e-20 or something smaller. | min x, subject to x > 0 ? Is it 1.e-10 or 1.e-20 or something smaller. | ||

</code> | </code> | ||

- | Optimization theory is usually concerned with bounded closed sets where closed means that the boundary is part of the feasible set. Thus is no difference between ''<'' and ''< ='' for continuous variables when dealing with numerical algorithms. For discrete variables, the constraints mean exactly what they say. ''=L='' means ''< ='', thus a constraint with an integer variable ''=L= 9'' means it can be less or equal to 9. If you want it to be less than 9, write the constraint as ''=L= 8''. | + | Optimization theory is usually concerned with bounded closed sets where closed means that the boundary is part of the feasible set. Thus there is no difference between ''<'' and ''< ='' for continuous variables when dealing with numerical algorithms. For discrete variables, the constraints mean exactly what they say. ''=L='' means ''< ='', thus a constraint with an integer variable ''=L= 9'' means it can be less or equal to 9. If you want it to be less than 9, write the constraint as ''=L= 8''. |

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