QQ登录

只需要一步,快速开始

 注册地址  找回密码
查看: 1737|回复: 0
打印 上一主题 下一主题

Mathematica 能否完全替代Lingo?

[复制链接]
字体大小: 正常 放大

11

主题

12

听众

38

积分

升级  34.74%

  • TA的每日心情
    奋斗
    2015-4-16 16:03
  • 签到天数: 2 天

    [LV.1]初来乍到

    跳转到指定楼层
    1#
    发表于 2015-4-15 14:24 |只看该作者 |倒序浏览
    |招呼Ta 关注Ta

    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。
    & X+ ?) m, g* S9 t+ t0 a6 ^+ [以下是lingo的代码* @2 j$ t7 a) N7 [% H2 k# C
    sets:
    1 ~; m6 e$ N9 o; o" y% fnodes/A,B,C,D,E,F,G,H,I,J,K,L/;
    ' O9 B; C% F9 m% larcs(nodes,nodes)/9 Y3 `) I( o" Z; R; J
    A,B A,E
    ( O! t! O' r1 W+ i3 N$ fB,C B,E B,F
    1 F! }, H% e* G2 wC,B C,D% x5 r/ u# |2 Z- ]7 ^# i
    D,C D,H
    5 g9 ]/ m/ [' R1 ME,A E,F
    $ _$ D* ^0 v8 ~  Y3 FF,B F,E F,G F,I F,J. L2 y3 }2 v5 j) R9 _0 D7 N$ q8 n
    G,C G,F G,H G,K
    + I( P' k" i9 O# {  |H,D H,K H,L
    + e$ J& M7 Y8 c9 M% P, kI,E I,J
    0 f) P0 I8 n5 d0 ^5 cJ,F J,G* W% J/ A; E# k, d: E% o& x
    K,G K,J8 ?- S/ K& [5 B5 E+ m0 Q  Z1 U
    L,K
    , B& a# C1 V  l/: c, x;0 C& D" @2 G" K
    endsets9 \. I3 [5 ^7 w: }
    data:8 j* U2 Q: x2 T5 s) g+ ^
    c=/ X" L1 M3 Z9 }! Y( S* s
    150 1652 l5 O! }/ i6 S$ \* _  M
    130 230 160; f6 ~# l# E+ S4 B( P
    140 100( v# {8 b( ]: y, e; z) A
    100 190
    . g; B% K" [; O0 f4 q# ~165 144( h. G; B- |! T- H
    170 144 128 218 174# E, `, i3 z  {
    200 122 109 185
    ( O$ Q$ R$ @/ U8 z180 141 190
    . ?2 t/ E' X- V! D: I! d194 148
    # i  P! {! W, \$ }5 l/ {/ L174 233
    , Q, s8 m" ]9 s* I185 135
    6 ^, ?7 a; v# x3 m110;3 i/ P# I4 |- h
    enddata  j  P" \* O" S
    n = @size(nodes);
    * x5 h' G6 `" _* m% Z1 `( D1 o$ Vmin = @sum(arcs: c * x);. s$ C* G/ d! e: c2 Z+ u4 ~
    @for(nodes(i):
    2 [+ |; l: R% y' w9 D@sum(arcs(i,j):x(i,j))=@sum(arcs(k,i):x(k,i))
    4 c. k1 A9 h; Q2 V! X1 O( {);, [8 S, y% q- O0 U  ?2 c* o
    @for(arcs: @bnd(1,x,9)); ( N7 v# b+ ^8 O: t% d' c
    * V2 t2 |7 n& w( N5 Q# d2 Z) u; \
    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:

      Y7 j% n! B$ I' ]! V- d/ V: H

    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];


    ; s1 e9 e& }5 k1 T6 O- E' h; K

    open[1000]


    * A, J/ y' f% I' [% w0 p- h8 x  E- w" |: y$ f  q$ f  E5 d! {( k0 R
    zan
    转播转播0 分享淘帖0 分享分享0 收藏收藏0 支持支持0 反对反对0 微信微信
    您需要登录后才可以回帖 登录 | 注册地址

    qq
    收缩
    • 电话咨询

    • 04714969085
    fastpost

    关于我们| 联系我们| 诚征英才| 对外合作| 产品服务| QQ

    手机版|Archiver| |繁體中文 手机客户端  

    蒙公网安备 15010502000194号

    Powered by Discuz! X2.5   © 2001-2013 数学建模网-数学中国 ( 蒙ICP备14002410号-3 蒙BBS备-0002号 )     论坛法律顾问:王兆丰

    GMT+8, 2026-4-18 19:29 , Processed in 0.393663 second(s), 50 queries .

    回顶部