Milk Collection: How to Route and Assign Milk Collection Lorries to Farms

The following data set and macro variables contain the input data that are used in this example:

data farm_data;
   farm = _N_;
   input east north frequency requirement;
   datalines;
 0  0 2 0
-3  3 2 5
 1 11 2 4
 4  7 2 3
-5  9 2 6
-5 -2 2 7
-4 -7 2 3
 6  0 2 4
 3 -6 2 6
-1 -3 2 5
 0 -6 1 4
 6  4 1 7
 2  5 1 3
-2  8 1 4
 6 10 1 5
 1  8 1 6
-3  1 1 8
-6  5 1 5
 2  9 1 7
-6 -5 1 6
 5 -4 1 6
;

%let distance_scale = 10;
%let num_days = 2;
%let capacity = 80;
%let depot = 1;