Originally posted by: ALessin

I am trying to display a flow solution using post-processing commands, but I can't figure out how to display the solution arcs in the correct order. For example, the flow solution vector begins as follows:

<from node,to node,Flow[a]>

<0,1,1>
<1,10,1>
<2,11,1>
<10,2,1>
<11,20,1>
<20,30,1> ...,

and my solution is displaying as: 

BreachSolution = [ 0 1 10 11 2 20 30  ....

when I would like it to display correctly as:

BreachSolution = [ 0 1 10 2 11 20 30 ....

Do you know how I could implement this using the appropriate post-processing commands? Thank you.

Hi,

if you add

tuple arcsolution
{
 key int fromnode;
 int tonode;
}

{arcsolution} ArcsSolution={<a.fromnode,a.tonode> | a in Arcs : y[a] > 0};
{arcsolution} ArcsSolution2={};

range r=0..card(ArcsSolution)-2;
int sol[0..card(ArcsSolution)-1];

execute
{
sol[0]==0;
var t=Opl.first(ArcsSolution);

for(var i in r)
{
    ArcsSolution2.add(t);
    t=ArcsSolution.find(t.tonode);
    writeln(t.tonode);
    sol[i+1]=t.tonode;
}
write("\nBreachSolution2 = ",sol); //Displays the path solution vector to be used for plotting purposes in MATLAB

}

you will get

BreachSolution2 =  [0 10 2 11 20 30 21 31 22 32 41 50 59 69 78 87 96 106 115 124 116 125 134 143
     133 142 132 141 131 140 130 139 148 156 163]

regards

Originally posted by: ALessin

Thank you very much, Alex. I tried following a similar piece of code in the netflow example, but I couldn't get it to work properly. The only issue here is that the solution is missing the first "tonode" value of "1," in this case. I changed

writeln(t.tonode);
sol[i+1]=t.tonode;

to:

writeln(t.fromnode); 
sol[i+1]=t.fromnode; 

and now get: BreachSolution2 =  [0 1 10 2 11 20 30 21 31 22 32 41 50 59 69 78 87 96 106 115 124 116 125 134
     143 133 142 132 141 131 140 130 139 148 156].

This solution now leaves out the last "tonode" value, but that is fine since it's just an artificial terminus node.

Thanks again for your assistance!

Hi,

you re welcome.

A few useful links at https://www.ibm.com/developerworks/community/forums/html/topic?id=0d0b2396-3b48-4638-b032-3b9ea74f1a11&ps=25

regards