Similar to the computer programs of the preceding papers, the computer program below seeks to solve an integer version of Schittkowski's Test Problem 289. The source of this Test Problem 289 is S. Walukievicz; see Schittkowski [14, p. 113]. Thus, the computer program below tries to minimize the following:
30
1 - EXP( -(1/60)* SIGMA X(i) ^2 )
i=1
-10<= X(i) <= 10, X(i) integer, i=1, 2, 3,..., 30.
One notes line 114, which is 114 A(J44)=-10+RND*20.
0 REM DEFDBL A-Z
1 DEFINT J,K,B,X
2 DIM A(90),X(90),T(90),Y(90)
88 FOR JJJJ=-32000 TO 32000
89 RANDOMIZE JJJJ
90 M=-1.5D+38
91 GOTO 111
92 A(2)=2+RND*4000
93 A(3)=3+RND*4000
94 A(4)=4+RND*4000
95 A(5)=-4000+RND*8000
111 FOR J44=1 TO 30
114 A(J44)=-10+RND*20
117 NEXT J44
128 FOR I=1 TO 32000
129 FOR KKQQ=1 TO 30
130 X(KKQQ)=A(KKQQ)
131 NEXT KKQQ
139 FOR IPP=1 TO FIX(1+RND*3)
140 B=1+FIX(RND*30)
144 GOTO 167
145 IF RND<.5 THEN 150 ELSE 167
150 R=(1-RND*2)*A(B)
160 X(B)=(A(B) +RND^3*R)
162 GOTO 168
163 IF RND<.5 THEN X(B)=(A(B)-.001) ELSE X(B)=(A(B) +.001 )
165 GOTO 168
167 IF RND<.5 THEN X(B)=CINT(A(B)-1) ELSE X(B)=CINT(A(B) +1 )
168 REM IF A(B)=0 THEN X(B)=1 ELSE X(B)=0
169 NEXT IPP
171 FOR J44=1 TO 30
174 IF X(J44)>10 THEN X(J44)=A(J44)
175 IF X(J44)<-10 THEN X(J44)=A(J44)
177 NEXT J44
401 SUMM=0
402 FOR J44=1 TO 30
411 SUMM=SUMM+ X(J44) ^2
421 NEXT J44
699 PD1=-1+EXP(-(1/60)*SUMM )
1111 IF PD1<=M THEN 1670
1452 M=PD1
1454 FOR KLX=1 TO 30
1455 A(KLX)=X(KLX)
1456 NEXT KLX
1557 GOTO 128
1670 NEXT I
1889 IF M<-3 THEN 1999
1923 PRINT A(1),A(2),A(3),A(4),A(5)
1924 PRINT A(6),A(7),A(8),A(9),A(10)
1925 PRINT A(11),A(12),A(13),A(14),A(15)
1926 PRINT A(16),A(17),A(18),A(19),A(20)
1928 PRINT A(21),A(22),A(23),A(24),A(25)
1929 PRINT A(26),A(27),A(28),A(29),A(30)
1939 PRINT M,JJJJ
1999 NEXT JJJJ
This BASIC computer program was run via basica/D of Microsoft's GW-BASIC 3.11 interpreter for DOS. See the BASIC manual [11]. Copied by hand from the screen, this computer program's complete output through JJJJ=-31994 is shown below:
2 -5 5 -7 8
0 7 1 5 -9
-6 7 -10 8 -9
-4 8 -9 6 7
-8 3 -6 -6 3
0 -7 3 -3 6
-1 32000
-5 8 -8 -9 -6
-1 1 -7 9 -2
0 -9 -6 -9 0
-7 0 -3 -7 8
0 -9 -2 0 -5
-5 -6 -9 -3 -6
-1 31999
7 8 -5 9 8
5 8 3 10 -6
-6 7 -9 5 -4
2 -5 0 7 1
8 -3 -2 7 -7
-8 8 9 3 2
-1 -31998
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 -31997
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 -31996
0 9 -4 8 9
-3 -7 -1 -5 5
-7 -9 10 2 6
7 4 -7 -9 -4
0 -4 -6 0 1
3 -7 6 9 5
-1 -31995
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 -31994
M=0 is optimal; see Schittkowski [14, p. 113].
Above there is no rounding by hand.
On a personal computer with a Pentium Dual-Core CPU E5200 @2.50GHz, 2.50 GHz, 960 MB of RAM, and the IBM basica/D interpreter, version GW BASIC 3.11, the wall-clock time for obtaining the output through JJJJ=-31994 was 32 seconds.
Acknowledgment
I would like to acknowledge the encouragement of Roberta Clark and Tom Clark.
References
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[10] Duan Li, Xiaoling Sun, Nonlinear Integer Programming. Publisher: Springer Science+Business Media,LLC (2006). http://www.books.google.ca/books?isbn=0387329951
[11] Microsoft Corp., BASIC, Second Edition (May 1982), Version 1.10. Boca Raton, Florida: IBM Corp., Personal Computer, P. O. Box 1328-C,Boca Raton, Floridda 33432, 1981.
[12] Harvey M. Salkin, Integer Programming. Menlo Park, California: Addison-Wesley Publishing Company (1975).
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[14] K. Schittkowski, More Test Examples for Nonlinear Programming Codes. Springer-Verlag, 1987.
[15] S. Surjanovic, Zakharov Function. www.sfu.ca/~ssurjano/zakharov.html
[16] Jsun Yui Wong (2012, April 23). The Domino Method of General Integer Nonlinear Programming Applied to Problem 2 of Lawler and Bell. http://computationalresultsfromcomputerprograms.wordpress.com/2012/04/23/
[17] Jsun Yui Wong (2013, September 4). A Nonlinear Integer/Discrete/Continuous Programming Solver Applied to a Literature Problem with Twenty Binary Variables and Three Constraints, Third Edition. http://myblogsubstance.typepad.com/substance/2013/09/
[18] Jsun Yui Wong (2014, June 27). A Unified Computer Program for Schittkowski's Test Problem 377, Second Edition. http://nonlinearintegerprogrammingsolver.blogspot.ca/2014_06_01_archive.html
