Dear all,
I'm solving a variation of a max flow problem in a graph, where:
set V, default {1..n}; /* is a set of nodes */
set E, within V cross V; /* is a set of arcs */
set L, within E cross E; /* is a set to map edges to edges */
var x2{(i,j) in E}, binary; /* x2[i,j] indicates whether there is any
flow going through link (i,j) */
And I have the following condition:
> s.t. condition{(i,j) in E}: (sum{(i,j,i1,j1) in L} x2[i1,j1] <=0) or
(sum{(i,j,i1,j1) in L} x2[i1,j1] >= 2);
Basically, this means that I need the sum of those x2[i1,j1] to be
different from 1 (i.e. less or equal to 0 *or* bigger or equal than 2).
Although, this code gives me the following error:
"operand preceding <= has invalid type"
Any idea?
Thank you,
Joao
_______________________________________________
Help-glpk mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/help-glpk
