用MATLAB解方程的问题 急~~

来源：百度知道 编辑：UC知道 时间：2024/09/24 07:18:25
我是个刚学习MATLAB的新手 本来想用18个方程解18个未知数 用的命令如下
l1=20
[l2,l3,l4,l5,l6,l7,l8,l9,a1,a2,a3,a4,a5,a6,a7,a8,a9,a11]=solve('(l5+l1*cos(a1)-l3*cos(a2))^2+(l4+l3*sin(a2)-l1*sin(a1))^2=l2^2','l4+l6*sin(a2)=l1*sin(a1+pi)-sqrt(l7^2*(l1*sin(a1+pi)-l8)^2/((l8-l1*sin(a1+pi))^2+(l1*cos(a1+pi)-l9)^2)','(l5+l1*cos(a1+pi/5)-l3*cos(a3))^2+(l4+l3*sin(a3)-l1*sin(a1+pi/5))^2=l2^2','l4+l6*sin(a3)=l1*sin(a1+pi+pi/5)-sqrt(l7^2*(l1*sin(a1+pi+pi/5)-l8)^2/((l8-l1*sin(a1+pi+pi/5))^2+(l1*cos(a1+pi+pi/5)-l9)^2)','l4+l6*sin(a4)=l1*sin(a1+pi*7/5)-sqrt(l7^2*(l1*sin(a1+pi*7/5)-l8)^2/((l8-l1*sin(a1+pi*7/5))^2+(l1*cos(a1+pi*7/5)-l9)^2)','l4+l6*sin(a5)=l1*sin(a1+pi*8/5)-sqrt(l7^2*(l1*sin(a1+pi*8/5)-l8)^2/((l8-l1*sin(a1+pi*8/5))^2+(l1*cos(a1+pi*8/5)-l9)^2)','l4+l6*sin(a6)=l1*sin(a1+pi*9/5)-sqrt(l7^2*(l1*sin(a1+pi*9/5)-l8)^2/((l8-l1*sin(a1+pi*9/5))^2+(l1*cos(a1+pi*9/5)-l9)^2)','l4+l6*sin(a7)=l1*sin(a1+pi*4/5)-sqrt(l7^2*(l1*sin(a1+pi*4/5)-l8)^2/((l8-l1*sin(a1+pi

没有 等号 等式 右边 是 0 不用输

还有 你括号 打乱了

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%哥们 我给你改了好半天
l1=20;
[l2,l3,l4,l5,l6,l7,l8,l9,a1,a2,a3,a4,a5,a6,a7,a8,a9,a11]=solve(...
'(l5+l1*cos(a1)-l3*cos(a2))^2+(l4+l3*sin(a2)-l1*sin(a1))^2-l2^2', ...
'-l4-l6*sin(a2)+l1*sin(a1+pi)-sqrt(l7^2*(l1*sin(a1+pi)-l8)^2/((l8-l1*sin(a1+pi))^2+(l1*cos(a1+pi)-l9)^2))',...
'(l5+l1*cos(a1+pi/5)-l3*cos(a3))^2+(l4+l3*sin(a3)-l1*sin(a1+pi/5))^2-l2^2',...
'-l4-l6*sin(a3)+l1*sin(a1+pi+pi/5)-sqrt(l7^2*(l1*sin(a1+pi+pi/5)-l8)^2/((l8-l1*sin(a1+pi+pi/5))^2+(l1*cos(a1+pi+pi/5)-l9)^2))',...
'-l4-l6*sin(a4)+l1*sin(a1+pi*7/5)-sqrt(l7^2*(l1*sin(a1+pi*7/5)-l8)^2/((l8-l1*sin(a1+pi*7/5))^2+(l1*cos(a1+pi*7/5)-l9)^2))',...
'-l4-l6*sin(a5)+l1*sin(a1+pi*8/5)-sqrt(l7^2*(l1*sin(a1+pi*8/5)-l8)^2/((l8-l1*sin(a1+pi*8/5))^2+(l1*cos(a1+pi*8/5)-l9)^2))',...
'-l4-l6*sin(a6)+l1*sin(a1+pi*9/5)-sqrt(l7^2*(l1*sin(a1+pi*9/5)-l8)^2/((l8-l1*sin(a1+pi*9/5))^2+(l1*c