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Set Constructor Expression

{ [ expression-1 [, ...expression-n] ] }

The set constructor expression returns the set of the expressions in the member list. Duplicated values are added to the set only once. A warning message is produced when duplicates are detected. The constructor expression consists of 0 or more subexpressions of the same scalar type or of tuple expressions that match in length and in element types.

The following code outputs a three-member set and warns about the duplicated value 2:

  
    proc optmodel; 
       put ({1,2,3,2}); /* outputs {1,2,3} */
 

The following example produces a three-member set of tuples, using PROC OPTMODEL parameters and variables. The output is displayed in Output 6.30.

    proc optmodel;
       number m = 3, n = 4;                                                                                                                           
       var x{1..4} init 1;                                                                                                                            
       string y = 'c';                                                                                                                                
       put ({<'a', x[3]>, <'b', m>, <y, m/n>});
 

                                                                                
                                                                                 
                                                                                 
 {<'a',1>,<'b',3>,<'c',0.75>}