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要求从1开始,最终回到1,且路径有方向,要求所有路径都经过。 t3 }1 r$ q; l5 _8 C$ H5 A
以下是lingo的代码
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* X" {/ T+ w7 V! D _# ?& B7 Mnodes/A,B,C,D,E,F,G,H,I,J,K,L/;
4 w0 }% X$ s) u1 e5 ?- F/ i0 }arcs(nodes,nodes)/) [0 u n" p! G% J) N& e7 A" g
A,B A,E
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F,B F,E F,G F,I F,J
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H,D H,K H,L
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L,K
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endsets% D. N6 \4 I2 ^+ U- B
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c=
$ r* o/ b9 T; W+ Z- [150 165
6 y' [- v3 S/ _, D130 230 160
: K+ U0 _. t: z' }6 h" y6 n140 100) h) ~- ?1 |5 R2 M* u
100 1906 a( `2 U x v5 [# J
165 144
0 C3 a! ?3 ~) ?170 144 128 218 1741 Y3 C; p7 s2 a! I! v" w
200 122 109 1857 z; ~$ J$ `' h7 b8 p+ P
180 141 190/ C, F, U% X' [) ?5 m. O; i) _) V
194 148; `$ ^ \8 i: \
174 233
$ p2 A0 q* h, H7 k* F5 w2 M7 i; E! L185 135
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enddata
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min = @sum(arcs: c * x);; `! W# @3 I. n- W
@for(nodes(i):
3 u% I$ C9 o6 g' m@sum(arcs(i,j):x(i,j))=@sum(arcs(k,i):x(k,i))* {" w2 i- p3 X9 _1 J& N! Z4 O0 d
);
: U5 y9 w" V9 t& d# v@for(arcs: @bnd(1,x,9)); 4 z* O# Z. x' E$ G
4 T6 Z" R: B# Z4 W& I它只能算出路径的步数和路程,并不能得到线路。希望能用mma解决这个问题。 --------------------------------------------------------------------- 自己用mma写的程序对于四点还可以,但是扩展到12点实在繁琐:
7 D& C/ k7 ?) k* {6 @P11 = {2, 5}; P12 = {150, 165}; P21 = {5, 6}; P22 = {230, 160}; P51 = {1, 6}; P52 = {165, 144}; P61 = {2, 5}; P62 = {170, 144};(*只考虑1、2、5、6四点,P11为第一点“可去往的点”,P12表述对应的路程*) open[q_] := Module[{i = 1, randomD, randomP, D, randomreal, p1, p2, p5, p6, c, u, Df = 80000, uf, path = {1}, pathf = {1}, pb},(*随机搜索*) For[r = 0, r < q, r++, {p1 = {}; p2 = {}; p5 = {}; p6 = {}; u = 0; D = 0; i = 1; randomP = P11; randomD = P12; While[ Length[p1] != 2 || Length[p2] != 2 || Length[p5] != 2 || Length[p6] != 2 || i != 1, randomreal = RandomInteger[{1, Length[randomP]}]; c = randomP[[randomreal]]; AppendTo[path, c];(*Print[path];*) Which[ i == 1 && Product[If[p1[] != c, 1, 0], {i, 1, Length[p1]}] == 1, {AppendTo[p1, c]}, i == 2 && Product[If[p2[] != c, 1, 0], {i, 1, Length[p2]}] == 1, {AppendTo[p2, c]}, i == 5 && Product[If[p5[] != c, 1, 0], {i, 1, Length[p5]}] == 1, {AppendTo[p5, c]}, i == 6 && Product[If[p6[] != c, 1, 0], {i, 1, Length[p6]}] == 1, {AppendTo[p6, c]}]; i = c; D = D + randomD[[randomreal]]; Which[i == 1, {randomP = P11, randomD = P12}, i == 2, {randomP = P21, randomD = P22}, i == 5, {randomP = P51, randomD = P52}, i == 6, {randomP = P61, randomD = P62}]; u = u + 1; If[u > 11, Break[]]; If[Df > D, {Df = D, uf = u, pathf = path, path = {1}}, path = {1}]; } ]; Print[Df, ",", uf, ",", pathf];
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