[Cmpl] some CMPL errors

[Prof. Dr. Mike Steglich]

Hi Anna,

I apologize the very delayed answer. There was obesely a misunderstanding between me and Thomas (my teammate) who shout answer you.
 Please see my answers below:
 
Am 30.04.2014 um 17:24 schrieb Anna Tarantini <anna.tarantini at hotmail.it>:

> Hi, we're trying to formulate a simple model to get the layout of a MAN. 
> While compiling the CMPL we get some errors:
> 
> error(compiler): file prova.cmpl line 55: syntax error, unexpected SYMBOL_VAR
> error(compiler): file prova.cmpl line 64: syntax error, unexpected ASSIGN_ITER, expecting ':'
> error(compiler): file prova.cmpl line 64: syntax error, unexpected '}', expecting end of file
> 
> here's the CMPL file 
> 
> 
> 
> %arg -ignoreZeros
> 
> 
> 
> parameters:
> 
> f:=30;
> alfa:=40;
> r:=(1,2,3,4,5);
> beta:=20;
> omega:=10;
> 
> seed:=srand(100);
> 	M:=10000;
> 
> 	nrOfCities:=5;
> 	NODES:=1..nrOfCities;
> 
> 	{i in NODES:
> 		  xp[i]:=rand(100);
> 		  yp[i]:=rand(100);
> 	}
> 
> 	{i in NODES, j in NODES:
> 	    {i==j: 
> 		dist[i,j]:=M; |
> 	    default: 
> 		dist[i,j]:= sqrt( (xp[i]-xp[j])^2 + (yp[i]-yp[j])^2 );
> 		dist[j,i]:= dist[i,j]+rand(10)-rand(10);
> 	    }
> 	}
> 
> 
> #include "istanza0.cmpl"
> 
> 
> variables:
> 
> 
> 
> w[NODES, NODES]: integer[0..];
> 
> y[NODES, NODES]: integer[0..1];
> 
> x[NODES, NODES]: integer[0..];
> 
> 
> 
> objectives:
> 
> 
> 
> cost: (sum{j:=1..nrOfCities : sum{i:=1..(j-1):  y[i,j] }} * f) +
>       
>      (alfa * sum{j:=1..nrOfCities: sum{i:=1..(j-1):  d[i,j] * w[i,j] }}) -> min;

The parameter array d[,] is not defined. I would assume that you want to use dist[,]. You can additionally simplify your objective function because the two sums run over the same sets.

This is my proposal:

cost: sum{j in 1..nrOfCities, i in 1..(j-1):  y[i,j]* f + alfa * dist[i,j] * w[i,j] } -> min;



> 
> 
> 
> 
> constraints:
> 
> strands { i in NODES, j in NODES : w[i,j] <= k * y[i,j]; }

k is not defined.



> 
> flow  { j in NODES-1 : sum{ j in NODES, i in NODES : x[j,i] } - sum{ i in NODES, j in NODES : x[i,j] } = r[j] * beta; }

> hubFlow  { j in NODES-1 : sum{ j in NODES : x[j, NODES] } - sum{ j in NODES : x[NODES,j] } = - sum{ j in NODES-1 : r[j] * beta }; }

This is a little bit more difficult to answer:
Do you want really to use the index j in the outer and the inner sums? If not please use another index for the outer sum. Do you mean j in (1..nrOfCities-1)  instead j in NODES-1. In my mind does make NODES-1 not really sense. 

I do not understand the idea of  x[j, NODES].  Do you want to address a single element of the array x[,] or the vector out of the matrix x[,]?
 

> 
> capacity { i in NODES, j in NODES : x[j,i] + x[i,j] <= w[i,j] * omega; }
> 
> 
> 
> Any clue of how to resolve those errors?
> Greetings
> 

Thanks,

Mike




> Anna
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