Question

用matlab求二元二次方程组的解，程序如下，十万火急!大神请帮忙纠错!

syms x y L1 L2 L3 L4 a1 a2 L5 a3 a4 eq1=solve('(x-(L3*cos(a3)-L1*cos(a1)))^2+(y-(L3*sin(a3)+L1*sin(a1)))^2=L3^2') eq2=solve('(x-(L5+L2*cos(a2)))^2+(y-(L1*sin(a1)))^2=L5^2') [x,y]=solve(eq1,eq2,x,y)

Answer 1

你的问题出错在于
1、变量赋值错误。eq1和eq2应改为
eq1='(x-(L3*cos(a3)-L1*cos(a1)))^2+(y-(L3*sin(a3)+L1*sin(a1)))^2=L3^2';
eq2='(x-(L5+L2*cos(a2)))^2+(y-(L1*sin(a1)))^2=L5^2';
2、solve()函数格式不对。应改为[x,y]=solve(eq1,eq2,‘x’,‘y’)
正确代码为
>>
syms
x
y
L1
L2
L3
L4
a1
a2
L5
a3
a4
>>
eq1='(x-(L3*cos(a3)-L1*cos(a1)))^2+(y-(L3*sin(a3)+L1*sin(a1)))^2=L3^2';
>>
eq2='(x-(L5+L2*cos(a2)))^2+(y-(L1*sin(a1)))^2=L5^2';
>>
[x,y]=solve(eq1,eq2,'x','y')
x
=。。。
y=。。。