minimum value is selected always from last iteration

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part_machine=[1 0 0 1 0 1 1;
0 1 1 1 0 0 1;
1 0 0 1 1 0 0;
1 0 0 0 1 0 1;
1 1 0 0 0 1 0;
0 1 0 0 0 1 1];
demand=[600;550;620;500;590;600];
numIterations=3;
for k=1:numIterations
rand_cell_assigntomachines=randi([0,1],7,3);
Part_cell=part_machine*rand_cell_assigntomachines;
Part_cell(Part_cell>=1)=1;
no_of_movements=sum(Part_cell,2)-1;
movement_cost=sum(bsxfun(@times,no_of_movements,demand))
end
minval=min(movement_cost)
the result is
movement_cost =
5110
movement_cost =
6920
movement_cost =
6300
minval =
6300
but in 3 iterations, 6300 is not minimum value.. I checked it and the value which is always picked as min is from the last iteration.. why is this so?

Accepted Answer

Walter Roberson
Walter Roberson on 16 Dec 2016
Assign to movement_cost(k) instead of overwriting all of movement_cost
  3 Comments
summyia qamar
summyia qamar on 19 Dec 2016
I'm running this code.
part_machine=[1 0 0 1 0 1 1
0 1 1 1 0 0 1
1 0 0 1 1 0 0
1 0 0 0 1 0 1
1 1 0 0 0 1 0
0 1 0 0 0 1 1];
demand=[600;550;620;500;590;600];
numIterations=100;
for k=1:numIterations
rand_cell=randi([0,1],7,3);
if all(sum(rand_cell,2)==1);
Part_cell(k)=part_machine*rand_cell;
end
Part_cell(Part_cell>=1)=1
no_of_movements=sum(Part_cell,2)-1;
movement_cost(k)=sum(bsxfun(@times,no_of_movements,demand));
end
minval=min(movement_cost);
[rand_cell minval(ones(7,1))]
the idea behind this code is * generate rand_cell * select that rand_cell in which sum of rows is 1 * multiply Part_machine matrix with that rand_cell * then apply the other functions on part_machine matrix * then at the end select the minval from all iterations * result is displayed with that rand_cell matrix which has generated the minimum value
now the result I'm getting is like this
ans =
1 0 1 6920
1 0 0 6920
0 1 0 6920
1 1 0 6920
1 1 1 6920
1 1 1 6920
1 0 1 6920
it is not the rand_cell matrix according to condition
all(sum(rand_cell,2)==1)
where is the problem?

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