，程序出错，求最短路径问题·····

X.w.j.拽.

a=zeros(53,53);
, r% ]& b8 w! M7 v! i; J6 La(36,35)=8.2;a(36,33)=14.9;a(35,38)=17.6;a(35,37)=11.5;a(38,39)=11;
a(38,2)=5.9;a(38,37)=12.2;a(37,34)=7.4;a(37,53)=8.8;a(34,32)=7.3;
a(32,33)=8.1;a(32,53)=9.2;a(53,30)=7.9;a(53,1)=12.9;a(33,31)=10.3;
0 T* s/ h( j; K" `a(31,52)=7.7;a(52,30)=7.2;a(52,29)=8.3;a(30,51)=15.2;a(1,2)=6;
2 E+ P7 q, e% G2 X# u# G% ka(1,39)=11.5;a(1,51)=10.1;a(1,49)=19.8;a(1,3)=9.2;a(39,4)=7.9;a(4,3)=4.8;
, c0 ~/ H* @1 k5 j3 k/ r) aa(4,40)=8.2;a(40,5)=12.7;a(40,6)=11.3;a(3,6)=8.3;
a(6,49)=11.4;a(6,7)=9.7;a(40,8)=15.1;a(51,29)=12.1;a(51,27)=10.5;
a(27,28)=7.8;a(29,28)=7.9;a(28,25)=18.8;a(27,50)=10.5;a(50,25)=13.2;
* |! ^# ~! B+ t: S. T5 ^9 Pa(50,24)=7.9;a(50,26)=8.8;a(50,49)=14.2;a(49,7)=9.5;a(49,26)=12;
: F2 O& D: c$ d  |$ a  z3 _' Ia(26,22)=7.8;a(26,21)=6.5;a(7,48)=11.8;a(7,8)=7.3;a(8,48)=14.5;
a(8,41)=7.2;a(41,9)=8;
+ l) ^2 j' i' E4 Q* ?a(9,5)=20.4;a(41,12)=14.2;a(41,10)=7.8;a(10,42)=5.6;a(42,11)=10.8;
; T4 N- i9 U  F- \# va(42,13)=12.2;a(43,13)=7.8;a(43,12)=6.8;
a(43,14)=8.6;a(46,12)=13.2;a(46,14)=9.8;a(46,45)=15.8;a(46,19)=8.2;
9 o+ v& _% I; Q' oa(46,20)=8.1;a(48,20)=7.2;a(48,21)=5.5;a(21,22)=7.9;a(21,20)=9.3;
4 ?9 r& P! L& n% o' ga(47,22)=4.1;a(47,23)=10.1;a(47,18)=9.8;a(47,19)=9.2;a(22,24)=9.1;
/ R9 b, \) A7 L: B( ia(24,25)=8.9;a(24,23)=10;a(23,18)=6.7;
; d9 u& J6 v+ Y6 O5 M1 @/ Y" a% U) la(18,17)=6.8;a(45,17)=11.8;
& J( p4 I! @1 M2 Ca(45,19)=8.2;a(45,16)=8.8;a(16,15)=15;a(44,15)=9.9;a(44,13)=10.2;a(15,14)=8.6;a(39,2)=11.2;a(34,33)=19;a(34,36)=20.3;
a=a+a';
a(find(a==0))=inf;
pb(1:length(a))=0;pb(1)=1;index1=1;index2=ones(1,length(a));
d(1:length(a))=inf;d(1)=0;temp=1;
& v; ~  H$ i2 g7 u3 ^$ l: Gwhile sum(pb)<length(a)
: N) l7 ^' ]+ Z! H( {. f$ N     tb=find(pb==0);
d(tb)=min(d(tb),d(temp)+a(temp,tb));
tmpb=find(d(tb)==min(d(tb)));
8 c/ b  j, C4 A3 O6 D# rtemp=tb(tmpb(1));
. H5 [* R! G) N' X( u0 K6 E8 gpb(temp)=1;
index1=[index1,temp];
% f( ]& h0 e# G: z% V8 Ptemp2=find(d(index1)==d(temp)-a(temp,index1));
7 L6 |! j) F( h+ y- Aindex2(temp)=index1(temp2(1));
end
d,index1,index2
??? Index exceeds matrix dimensions.
; ?- {3 m; \) _" H" f3 ~哪里有问题啊