Difference: LoopingInAMPL (4 vs. 5)

Revision 52008-03-18 - TWikiAdminUser

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META TOPICPARENT name="AMPLSyntax"
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Looping in AMPL

  1. for Loops
  2. let Loops
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  • Conditional Loops
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    for Loops

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     let {n in NODES : ('Chicago', n) in ARCS} Min['Chicago', n] := max(1000, Min['Chicago', n]);
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    >    		Return to top

    Conditional Loops

     
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    >    		AMPL also provides syntax for repeating a loop depending on a condition (often known as while loops). These loops use a condition, the repeat keyword, the while or until keyword and the { and } operators: 
    repeat while <expression> {
  <loop statements;>
};

repeat until <expression> {
  <loop statements;>
};
     
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    <    		Conditional Loops AMPL allows us to repeat a loop depending on a condition. Syntax: We can loop subject to a condition using the repeat keyword, the while or until keyword and the { and } operators. repeat while { }; repeat until { }; These statements check the expression before executing the loop statements. The first one continues while the expression is true, the second terminates when the expression is true. repeat { } while ; repeat { } until ; These statements check the expression after executing the loop statements. The first one continues while the expression is true, the second terminates when the expression is true.
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    >    		These statements check the expression before executing the loop statements. The first one continues while the expression is true, the second terminates when the expression is true. AMPL provides loops that check the expression after the loop completes: 
    repeat {
  <loop statements;>
} while <expression>;

repeat {
  <loop statements;>
} until <expression>;
    As before, the first loop continues while the expression is true, the second terminates when the expression is true.
     
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    >    		Examples coming soon!
     
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    <    		???Using symbolic parameters to do conditional loops over sets (see symbolic parameters)???
     -- TWikiAdminGroup - 18 Mar 2008 \ No newline at end of file
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