高人看看这个迭代法解方程组的程序有什么问题

keaixiaonvren

L1=0.03;L2=0.08;L3=0.06;L4=0.1;
theta1=0;theta2=0.5;theta3=1.2;
f1=L2*cos(theta2)+L3*cos(theta3)+L1*cos(theta1)-L4;
f2=L2*sin(theta2)-L3*sin(theta3)+L1*sin(theta1);
while (abs(f1)>10^(-15))|(abs(f2)>10^(-15))
X=[(-0.08*sin(theta2)) (-0.06*sin(theta3));(0.08*cos(theta2)) (-0.06*cos(theta3))];
c=inv(X);
c=c*[(0.1-0.08*cos(theta2)-0.06*cos(theta3)-0.03*cos(theta1));(0.06*sin(theta3)-0.08*sin(theta2)-0.03*sin(theta1))];
c1=c(1);
c2=c(2);
theta2=theta2+c1;
theta3=theta3+c2;
f1=0.08*cos(theta2)+0.06*cos(theta3)+0.03*cos(theta1)-0.1;
f2=0.08*sin(theta2)-0.06*sin(theta3)+0.03*cos(theta1);
end;
theta2
theta3
方程组 L2*cos(theta2)+L3*cos(theta3)+L1*cos(theta1)-L4=0;
L2*sin(theta2)-L3*sin(theta3)+L1*sin(theta1)=0;
运行了下 老陷入死循环 f1,f2的值应该越来越小,f2运行了一次就变大了,是不是公式错了啊

eight

原帖由 keaixiaonvren 于 2007-5-19 20:22 发表

                               
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L1=0.03;L2=0.08;L3=0.06;L4=0.1;
theta1=0;theta2=0.5;theta3=1.2;
f1=L2*cos(theta2)+L3*cos(theta3)+L1*cos(theta1)-L4;
f2=L2*sin(theta2)-L3*sin(theta3)+L1*sin(theta1);
while (abs(f1)>10^(-15))|( ...

循环条件太苛刻了，建议修改一下