MODI Method Examples, Transportation Problem
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8/11/2019 MODI Method Examples, Transportation Problem
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8/20/2014 MODI Method Examples, Transportation Problem
http://www.universalteacherpublications.com/univ/ebooks/or/Ch5/modiex.htm
MODI Method Examples:
Transportation ProblemIn the previous section, we provided the steps in MODI method
(modified distribution method)to solve a t ransportation
problem. In this section, we provide an example. Let's solve the
following example:
This example is the largest and the most involvedyou have read so far. So you must read t he stepsand the explanation mindfully.
Example: MODI Method (Modified
Distribution Method)
Consider the transportation problempresented in the following
table.
Distribution centre
D1 D2 D3 D4 Supply
Plant
P1 19 30 50 12 7
P2 70 30 40 60 10P3 40 10 60 20 18
Requirement 5 8 7 15
Determine the optimal solution of the above problem.
Solution.
An initial basic feasible solution is obtained by Matrix Minimum
Method and is shown in table 1.
Table 1
Distribution centre
D1 D2 D3 D4 Supply
Plant
P1 19 30 50 7
P2 30 60 10
P3
60 18
Requirement 5 8 7 15
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Initial basic feasible solution
12 X 7 + 70 X 3 + 40 X 7 + 40 X 2 + 10 X 8 + 20 X 8 = Rs. 894.
Calculating uiand vjusing ui + vj= cij
Substituting u1= 0, we get
u1 + v4= c140 + v4= 12 or v4= 12
u3 + v4= c34u3+ 12 = 20 or u3= 8
u3 + v2= c328 + v2= 10 or v2= 2
u3 + v1= c318 + v1= 40 or v1= 32
u2 + v1= c21 u2+ 32 = 70 or u2= 38
u2 + v3= c2338 + v3= 40 or v3= 2
Table 2
Distribution centre
D1 D2 D3 D4 Supply ui
Plant
P1 19 30 50 7 0
P2 30 60 10 38
P360 18 8
Requirement 5 8 7 15
vj 32 2 2 12
Calculating opportunity costusing c ij ( ui + vj )
Unoccupied cells Opportunity cost
(P1, D1) c11 ( u1 + v1 ) = 19 (0 + 32) = 13
(P1, D2) c12 ( u1 + v2 ) = 30 (0 + 2) = 28
(P1, D3) c13 ( u1 + v3 ) = 50 (0 + 2) = 48
(P2, D2) c22 ( u2 + v2 ) = 30 (38 + 2) = 10
(P2, D4) c14 ( u2 + v4 ) = 60 (38 + 12) = 10
(P3, D3) c33 ( u3 + v3 ) = 60 (8 + 2) = 50
Table 3
Distribution centre
D1 D2 D3 D4 Supply ui
Plant
P1 7 0
P210 38
P318 8
Requirement 5 8 7 15
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vj 32 2 2 12
Now choose the smallest (most) negative value from opportunity
cost (i.e., 13) and draw a closed path fromP1D1. The following
table shows the closed path.
Table 4
Choose the smallest value with a negative position on the closed
path(i.e., 2), it indicates the number of units that can be shipped
to the entering cell. Now add this quantity to all the cells on thecorner points of the closed path marked with plus signs and
subtract it from those cells marked with minus signs. In this way,
an unoccupied cell becomes an occupied cell.
Now again calculate the values for ui& vjand opportunity cost.
The resulting matrix is shown below.
Table 5
Distribution centre
D1 D2 D3 D4 Supply ui
Plant
P1 7 0
P2 10 51
P3 18 8
Requirement 5 8 7 15
vj 19 2 11 12
Choose the smallest (most) negative value from opportunity cost
(i.e., 23). Now draw a closed path fromP2D2.
Table 6
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Examples Solving Equations Solve Equations Linear Equations
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