Saturday, March 3, 2018

Fuzzy Programming with Two Objective Functions Using the Product Operator


Jsun Yui Wong

Using the product operator, Zimmermann has converted his Example 2.1 problem with two goals [49, p. 46] to the following problem, Zimmermann [49, p. 52]:

Maximize   (1 / 238) * (-2 * X(1) ^ 2 + 3 * X(1) * X(2) + 13 * X(1) - 11 * X(2) + 2 * X(2) ^ 2 - 21)

subject to

        - X(1) + 3 * X(2)<=21,

         X(1) + 3 * X(2)<=27,

        4 * X(1) + 3 * X(2)<=45,

         3 * X(1) + X(2)<=30,

        X(1), X(2)>=0.

The computer program listed below seeks to solve the model immediately above.  X(3) through X(6) below are slack variables. 


0 DEFDBL A-Z

2 DEFINT K

3 DIM B(99), N(99), A(99), H(99), L(99), U(99), X(1111), D(111), P(111), PS(33)

12 FOR JJJJ = -32000 TO 32000 STEP .01


    14 RANDOMIZE JJJJ
    16 M = -1D+37
    51 FOR J40 = 1 TO 2
     
        55 A(J40) = RND * 2


    56 NEXT J40



    128 FOR I = 1 TO 1000


        129 FOR KKQQ = 1 TO 2



            130 X(KKQQ) = A(KKQQ)
        131 NEXT KKQQ
        133 FOR IPP = 1 TO (1 + FIX(RND * 2))


            181 j = 1 + FIX(RND * 2)


            183 r = (1 - RND * 2) * A(j)
            187 X(j) = A(j) + (RND ^ (RND * 10)) * r
        222 NEXT IPP


        246 FOR J47 = 1 TO 2

            247 IF X(J47) < 0 THEN 1670
           

        249 NEXT J47

       

        318 X(3) = 21 + X(1) - 3 * X(2)


        321 X(4) = 27 - X(1) - 3 * X(2)



        322 X(5) = 45 - 4 * X(1) - 3 * X(2)
        323 X(6) = 30 - 3 * X(1) - X(2)


        337 FOR j44 = 3 TO 6


            338 IF X(j44) < 0 THEN X(j44) = X(j44) ELSE X(j44) = 0


        339 NEXT j44
        433 POBA = (1 / 238) * (-2 * X(1) ^ 2 + 3 * X(1) * X(2) + 13 * X(1) - 11 * X(2) + 2 * X(2) ^ 2 - 21) + 1000000 * (X(3) + X(4) + X(5) + X(6))


        466 P = POBA

        1111 IF P <= M THEN 1670


        1450 M = P

        1454 FOR KLX = 1 TO 6

            1455 A(KLX) = X(KLX)
        1456 NEXT KLX
        1557 GOTO 128

    1670 NEXT I
    1889 IF M < .5556 THEN 1999

    1900 PRINT A(1), A(2), A(3), A(4), A(5)
    1901 PRINT A(6), M, JJJJ

1999 NEXT JJJJ

This BASIC computer program was run with QB64v1000-win [47]. The complete output through JJJJ =  -31999.87000000002 is shown below:

5.630904744562785      7.123031751812368      0
0      0
0      .555616548152143       -31999.99

5.683612687394603      7.105462437530837      0
0      0
0      .5556691346397322      -31999.98

5.730704803906347      7.089765065363786      0
0      0
0      .555661265347894       -31999.87000000002

Above there is no rounding by hand; it is just straight copying by hand from the monitor screen. On a personal computer with a Pentium Dual-Core CPU E5200 @2.50GHz, 2.50 GHz, 960 MB of RAM and QB64v1000-win [47], the wall-clock time for obtaining the output through
JJJJ=  -31999.87000000002 was 2 or 3 seconds, not including the time for “Creating .EXE file.” One can compare the computational results above to those on page 52 of Zimmermann [49].             

Acknowledgment

I would like to acknowledge the encouragement of Roberta Clark and Tom Clark.

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