Hi,
I have a big problem trying to find a good constraint for the
following case:
---------------------------------------
param DEMANDS{NODES};
var DEMANDS_pd {NODES, NODES, NODES, NODES};
subject to demands_per_node_per_demand {i in NODES, j in NODES}:
DEMANDS_pd [i,j,j,i] = DEMANDS [i,j];
subject to demands_per_node_per_demand_2 {i in NODES, j in NODES}:
DEMANDS_pd [i,j,i,i] = -DEMANDS[i,j];
-------------------------------------------
The result variable DEMANDS_pd has the following apparence, for
example, for DEMANDS_pd[1,2,*,*]
1 2 3 4
1 0.5 0 0 0
2 -0.5 0 0 0
3 0 0 0 0
4 0 0 0 0
this table MUST have only two elements different from zero (the same
but opposite). I need a constraint that fixes the values of all the
elements a zero because with another contraints, the values can
change, and change all the result...
Thank you very much in advance,
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