Originally posted by: Nomykan

Hi everyone, 

i have a small problem and i got the problem solved but now the problem is that i got too many warnings in the solution. i solved the problem for small network but if i do it for large network i think it will be too much time consuming. help regarding this issue is required. for simplicity i have a network consisting of nodes and lines. each line has a starting node and an ending node like L1= from node 1 to 2, L2 from node 2 to 3  and so on. i declared in my model as 

range nodes=1..n;

float line[nodes][nodes]=...;

dvar float flow[nodes][nodes];

what would be the better option to use arrays or tuples in this case?

this works fines but as many of the configurations of the nodes are not used so i got too many warnings. i have attached the simple example here with this post. help in this regard will be appreciated. Thanks

You would do something like this:

tuple line {
  int from;
  int to;
}
{line} lines = ...;
float value[lines] = ...;
dvar float flow[lines];

where 'value' are the values that were previously stored in 'lines'. You have various examples for this in the examples that ship with CPLEX. For example in opl/examples/opl/models/TravelingSalesmanProblem/tsp.mod.

Originally posted by: Nomykan

Hi , 

Thanks a lot .. you made it so easy... i was just confused .... Thanks a lot..