Declaration of ordered pairs sets in AMPL -


I have a variable i [i, j, p] where i and j are set sets i specially I have defined variables like 

  set I; Jets set; Set p; Set the link within (i, j}; Ultimate U {LINKS, P}

In the .mod file, I have written in my .dat: 

 < Code> Set I: = 1 2 3 4; Set J: = Factory1 Factory2 Factory3 Factory4 Set Link: = (1, Factory 1) (2, Factory 1) (3, Factory 2) (4, Factory 2); Set P : = Prod1 prod2 prod3; Ultimate U default 0: = [1, Factory 1, *] prod1 0.5251 prod2 0.3738 [2, Factory 1, *] prod1 0.5052 prod2 0.3311 [3, Factory 2, *] prod1 0.5555 prod3 0.6666 [4] , Factory 2, *] prod3 0.6156 prod4 0.3353;

But this gives me errors as to how u is declared. I tried when trying to follow the document 

  Ultimate link: U: = [1, Factory 1, *] prod1 0.5251 prod2 0.3738 [2, Factory 1, *] prod1 0.5052 prod2 0.3311 [3, Factory 2, *] prod1 0.5555 prod3 0.6666 [4, Factory 2, *] prod3 0.6156 prod4 0.3353;

but also gives error

I hope someone can give me some help

There are two problems with your code: 

  •  
     and 
     
      set j: = factory factory 1 factory 2 factory 3 factory 4 in  
      not available Th semicolon    
  •  
      Use prod4 , which is not a member of the  P . 
     
    •   
     Otherwise it looks right.

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