How to solve this equation?
显示 更早的评论
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
Mario Malic
2020-8-29
编辑：Mario Malic
2020-8-29
Example from function solve in documentation.
syms a b c x
eqn = a*x^2 + b*x + c == 0 % equals to sign ==
eqn = cos(x).*(a.*sin(x) + b) == c;
solve(eqn, x)
Sara Boznik
2020-8-29
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
2020-9-4
编辑：Mario Malic
2020-9-4
You're missing double equals sign in your equations.
采纳的回答
Ali Muhammad Hassaan
2020-8-29
a=18
b=60
c=76.7
syms x
eqn = cos(x).*(a.*sin(x)+b) == c
solx=solve(eqn)
2 个评论
Sara Boznik
2020-8-29
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.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Programming 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
