How to solve this equation?

1 次查看（过去 30 天）
Sara Boznik
Sara Boznik 2020-8-29
编辑： Mario Malic 2020-9-4
Hi everyone,
I want to solve this equation in Matlab. Until now I have the following code:
a=18
b=60
c=76.7
syms x
solx=solve('cos(x).*(a.*sin(x)+b)=c','x')
I get next error: Check for missing argument or incorrect argument data type in call to function 'solve'.
Error in Untitled (line 8)
solx=solve('cos(x).*(a.*sin(x)+b)=c','x')
I dont know what it is wrong, can anybody help me?
Any help is appriciated.
  4 个评论
显示 2更早的评论
Kitty Visser
Kitty Visser 2020-9-4
编辑：Kitty Visser 2020-9-4
i have also this error
with this function
[V1,V2,V3]=solve('(V1-V2)/R1 = Is + 2*(V3-V2)/R3','(V2 - V1)/R1 + V2/R2 + (V2-V3)/R3 = 0','(V3-V2)/R3 + V3/R4 + 2*(V3-V2)/R3=0','V1','V2','V3')
Mario Malic
Mario Malic 2020-9-4
编辑：Mario Malic 2020-9-4
You're missing double equals sign in your equations.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Ali Muhammad Hassaan
a=18
b=60
c=76.7
syms x
eqn = cos(x).*(a.*sin(x)+b) == c
solx=solve(eqn)
  2 个评论
Vladimir Sovkov
Vladimir Sovkov 2020-8-29
The sintax is correct here but it is of no help to find the solution, because there is no real-type one, and "solve" refuses working with the complex type. To find the solution you should reformulate the problem as a system of two real-type equations for the real and imaginary parts being two unknown variables.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Equation Solving 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by