Question

求助高手，用matlab解带三角函数方程组的问题

[a,c]=solve('(-0.73*tan(0.31*c)+1.66)/(0.56*tan(0.31*c)+0.478)=tan(0.3*a-1.8)','0.475*cot(0.48*a)+1.44*cot(0.5*c)+0.77*cot(0.48*a)*cot(0.5*c)=1')
fplot(@humps,[-5 5])
eee

Warning: Explicit solution could not be found.
> In solve at 140

a =

[ empty sym ]

c =

[]
刚刚搞错啦，是这样的：[a,c]=solve('(-0.73*tan(0.31*c)+1.66)/(0.56*tan(0.31*c)+0.478)=tan(0.3*a-1.8)','0.475*cot(0.48*a)+1.44*cot(0.5*c)+0.77*cot(0.48*a)*cot(0.5*c)=1')

Warning: Explicit solution could not be found.
> In solve at 140

a =

[ empty sym ]

c =

[]

Answer 1

Explicit solution could not be found.这是个warning，不是error！
找不到精确解是指你的方程太复杂了，matlab不能得到具体的解析解。

Answer 2

a =

-190.57945254292023181134686927738

c =

93.77533965289313401818494907509
我的能算啊?

追问

能不能用二分法求解近似值呢？

Answer 3

这个很简单

追问

有什么方法解这个方程组啊？solve('(-0.73*tan(0.31*c)+1.66)/(0.56*tan(0.31*c)+0.478)=tan(0.3*a-1.8)','0.475*cot(0.48*a)+1.44*cot(0.5*c)+0.77*cot(0.48*a)*cot(0.5*c)=1')