how to organization a system of nonlinear equation?

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Hadi Gholamzadeh
Hadi Gholamzadeh 2021-10-6
编辑： Hadi Gholamzadeh 2021-10-6
I want organization a system of equation and an equantion obtian. There are 5 equation as a function:
function Fun = CD_Fun(Cd0, alpha, T, theta, D, V, CD, AC, air)
Fun(1,1) = T * sind(abs(theta)) == D;
Fun(2,1) = T * cosd(abs(theta)) == AC.m * 9.81;
Fun(3,1) = D == 0.5 * air.rho * V^2 * CD;
Fun(4,1) = CD == Cd0 + alpha * theta^2;
Fun(5,1) = theta == -2 * V;
end
So write a code to use CD_Fun, We known AC and air parameter:
syms Cd0 alpha
syms T theta D CD V
Fun = CD_Fun(Cd0, alpha, T, theta, D, V, CD, AC, air)
S = solve(Fun,[Cd0, alpha]);
And finally I want to get to this answer.
Cd0 + (-2*V)^2 * alpha = (2*AC.m*9.81*tand(abs(-2*V)))/(air.rho * V^2)
Please help me.
Thank your attention.

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