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How do I list all variables that have a certain property in the optimal solution?

April 26, 2017certain list optimal Property solution variables

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How do I list all variables that have a certain property in the optimal solution?

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The built-in parameter _nvars contains the number of variables; a symbolic parameter _varname[j] contains the AMPL name of the jth variable; and _var[j] is a “synonym” that refers to the jth variable.