Hi

I am trying to find minimum values of a 4 dimensional set. Namely,

I have Cost(I,J,K,V) and it is the cost parameter of arcs.

I: Origin node set

J: Destination node set

K: set of commodities

V: set of transportation modes (land, water, air)

Trying to find the mininum cost values among existing transportation modes for each arc.

The problem is that the value is always returning zero as some of the cost values do not exist.

How can I manage this? Any help is much appreciated…

I tried the below statement but it didn’t work.

## r(I,J,K) = smin(V,Cost(I,J,K,V) $(Cost(I,J,K,V) gt 0));

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