Decision Optimization

Originally posted by: banun

Hi,

I'm trying to create a variable for each node in a 3-d graph. - Node(x,y,z).
each one of {x,y,z} can change.
Is the IloIntVar(IloIntVar::ImplClass *) constructor suitable here ? I did not find any examples that use it...
If not - what shoud I use ?
Thanks
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

C++ API? You could use built in array Concert array types. I would go with

IloArray<IloArray<IloIntVarArray> > Node = ...

Note the space between the two closing angle brackets, a syntactic necessity since C++ is the devil's tool.

The warehouse.cpp example that comes with CPLEX shows how to build a two-dimensional array of IloNumVar. A three-dimensional array should be an easy extrapolation.

Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: banun

hi and thanks for your answer,

it's not so clear to me..
How, for example, I refer to the y cord of Node, using your solution ?

thanks
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

I'm not sure what you mean by 'cord'. If you mean a slice along the y dimension (i.e., all nodes where y=y0, any x, any z), you would have to use a loop:

for (int x = 0; x < xmax; x++) {
  for (int z = 0; z < zmax; z++) {
    // do something with Node[x][y][z]
  }
}

Paul

Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. (Goethe)
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: banun

hi and thanks for your answer,

it's not so clear to me..
How, for example, I refer to the y cord of Node, using your solution ?

thanks
#CPLEXOptimizers
#DecisionOptimization