Using the solve function for a more complex variable

Question

Noel Loh 2020-6-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549951-using-the-solve-function-for-a-more-complex-variable

编辑： Noel Loh 2020-6-23

采纳的回答： Devineni Aslesha

Hello,

the equations are as follows

i am trying to find cos2 (noted by c2) and sin2 (noted by s2), this is very simple if i did it via hand, but i am trying to solve this using matlab coding and i require some help as i cant seem to get the right answer using the solve function.

solution:

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darova 2020-6-18

What about solve?

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Answer 1

Devineni Aslesha 2020-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/549951-using-the-solve-function-for-a-more-complex-variable#answer_455926

在 MATLAB Online 中打开

Hi Noel,

Use the solve function to find the solution for the above equations as shown below.

syms x y z s1 s2 c1 c2
eqn1 = x + s1*c2 == 0;
eqn2 = y - s1*s2 == 0;
eqn3 = z - c1 == 0;
eqns = [eqn1 eqn2 eqn3];
sol = solve(eqns,[c2 s2 z]);

Here, sol.c2, sol.s2 and sol.z are the required solutions

For more information, refer the following link

https://www.mathworks.com/help/symbolic/solve.html

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madhan ravi 2020-6-23

Noel next time please show some efforts and don’t expect others to write the code for you.

Noel Loh 2020-6-23

编辑：Noel Loh 2020-6-23

thanks for your help mvp, i have spent weeks trying to solve it despite not being great at coding, finally solved it a few days ago, only to be recently reminded about the topic when an actual helpful person today helped give input on a possible solution, decided to thank the person's efforts without being rude, but also hear a supposingly mvp suddenly came in throwing an useless comment just to massage his tiny ego, but your comment helped i guess, good job.

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