MODI Method Examples, Transportation Problem

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    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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