Solving odes (restricted 3 body problems)

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Aneesa Shahbaz 2020-3-25

评论： Aneesa Shahbaz 2020-3-26

I have been trying to solve these equations -

d2x dt2 = 2 dy dt + x− M(x + E) r3 E − E(x−M) r3 M

d2y dt2 = −2 dx dt + y− My r3 E − Ey r3 M

z1 = x, z2 = dx dt , z3 = y, and z4 = dy dt

but keep getting these errors:-

Unrecognized function or variable 'rE'.

Error in secodef (line 4) zprime=[z(2);2*z(4)+z(1)-((M*(z(1)+E))/rE^3)-((E*(z(1)-M))/rM^3);z(4);-2*z(2)+z(3)-((M*z(3))/rE^3)-((E*z(3))/rM^3)];

Error in odearguments (line 90) f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ode45 (line 115) odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

Error in trial1 (line 13) [t,z] = ode45(@secodef,tspan,Z);

what do I do?

darova 2020-3-25

Variables rE and rM should be in the function

darova 2020-3-26

Do you know how to select columns?

Aneesa Shahbaz 2020-3-26

Not really no

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