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function x=Trid(a,b,c,d)
%  ×·¸Ï·¨Çó½âÈý¶Ô½ÇµÄÏßÐÔ·½³Ì×é   Ax=d
%  bΪÖ÷¶Ô½ÇÏßÔªËØ£¬a£¬c·Ö±ðΪ´Î¶Ô½ÇÏßÔªËØ£¬dΪÓÒ¶ËÏî
%  A=[ b1 c1
%      a2 b2 c2
%         ......
%            a_(n-1) b_(n-1) c_(n-1)
%                    a_(n)    b_(n) ]
%  b=[b1...b_(n)]
%  a=[0 a2...a_(n)]
%  c=[c1...c_(n-1)]

n=length(b);

u(1)=b(1);
for i=2:n
    l(i)=a(i)/u(i-1);
    u(i)=b(i)-l(i)*c(i-1);
end

y(1)=d(1);
for i=2:n
    y(i)=d(i)-l(i)*y(i-1);
end

x(n)=y(n)/u(n);
for i=n-1:-1:1
    x(i)=(y(i)-c(i)*x(i+1))/u(i);
end
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Robot (super robot)

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