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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。 ! i; [4 t; e h& E U/ Z
以下是lingo的代码
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4 v7 {1 ^7 Q/ B3 Z( A Marcs(nodes,nodes)/1 i1 G! M, ^; f0 `+ B
A,B A,E8 G1 B4 C+ e% i* p% }; d
B,C B,E B,F
+ m) u d6 H. L1 J8 H$ \; t0 nC,B C,D
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G,C G,F G,H G,K6 n( b" e/ Q0 O: p6 C
H,D H,K H,L3 ?, ]6 N, }" z' Y) w' Y( ?
I,E I,J
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endsets6 Y- d' n; Y2 J! K
data:
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* _" z6 w8 F+ e* S5 v5 y150 165
* J/ o5 p# [) B* f2 ?130 230 1607 }$ q# j4 V* D( T( c" e9 m
140 1008 b' @8 P& i' N3 H
100 190- ]8 e& c. f2 q0 {$ Y( Q f
165 144 ?, I+ ~& A6 Y3 G9 {. ?* w
170 144 128 218 174
/ s4 \2 M$ z8 S( `, U( I* ~200 122 109 185
% o- o: B$ `- r- x! g' Z& X180 141 1904 m' t: i: {& b+ x5 y
194 148: g, s4 S! k6 s* g7 S
174 233* X/ P4 z6 @( u
185 1350 D! [) _9 K5 b7 [
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enddata
4 e! f& B7 H/ ln = @size(nodes);
) g3 |. v; M2 G9 e- r( ?8 c" imin = @sum(arcs: c * x);
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@sum(arcs(i,j):x(i,j))=@sum(arcs(k,i):x(k,i))/ M; U4 K9 w) o+ l
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@for(arcs: @bnd(1,x,9));
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" ^, B/ ~- [, k) ^' [5 \" E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 m0 N- M- ]/ t/ A
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]; / Y# o! K6 i* Z( |
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