ILOG OPL Development Studio Language Reference Manual

initialize i to {1}, u to {1,2,3,5,7,9}, d to {2,3}, and sd to {2,3,4,5}.It is also possible to initialize a set from a range expression. For example, the declaration:{int} s = asSet(1..10)initializes s to {1,2,..,10}It is important to point out at this point that sets initialized by ranges are represented explicitly(unlike ranges). As a consequence, a declaration of the form{int} s = asSet(1..100000);creates a set where all the values 1, 2, ..., 100000 are explicitly represented, while the rangerange s = 1..100000;represents only the bounds explicitly.More about internal initialization of setsWhen writing the assignment s2=s1, you add one element to s1, that element is also addedto s2. If you do not want this, writes1={i|i in s2}For example, compare the statements in Initializing sets in the model file:Initializing sets in the model fileIf you writethe result is{1 2 3}{int} s1={1,2};{int} s2=s1;execute{s2.add(3);writeln(s1);}{1 2}{int} s1={1,2};{int} s2={ i | i in s1};//{int} s2=s1;execute{s2.add(3);writeln(s1);}50I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L