plot curve with matlab
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Hi. how can i plot this eq. to (qa-w)?
2502*cos(qa) - (6*w^2*cos(qa))/5 - (50873*w^2)/52500 + (123*w^4)/87500 - 357706/63=0
thank you
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回答（1 个）
Walter Roberson
2020-5-10
syms qa real
syms w
eqn = 2502*cos(qa) - (6*w^2*cos(qa))/5 - (50873*w^2)/52500 + (123*w^4)/87500 - 357706/63 == 0;
sol = solve(eqn);
sol = sol(isAlways(sol>0)); %4 solutions, 2 of which are complex, 1 is always negative for real qa
fplot(sol, [-pi pi])
7 个评论
saman ahmadi
2020-5-10
Walter Roberson
2020-5-10
Which MATLAB release are you using? When I execute the code, I get something Gaussian curve with peak 49.6 at x = 0
saman ahmadi
2020-5-10
Walter Roberson
2020-5-10
Okay, I will have to install that version; it will take a bit of time.
Walter Roberson
2020-5-10
I just tested in R2016a, and had no problem with the code.
What shows up for
size(sol)
class(sol)
saman ahmadi
2020-5-10
Walter Roberson
2020-5-10
Execute those in the command window after you run the code I posted earlier, and tell us what the results are. These are commands to help us debug the problem, not commands that will somehow fix the problem.
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2020-5-10
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2021-8-20
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