ODE45 Question Not Enough Input Argument

Hello,

Could anyone help why my rhs_trajectory function has Not Enough Input Argument error, please. The rhs_trajectory.m shall receive input from other functions which are thrust_force.m, drag_force.m and mass.m. The drag_force.m shall receive input from density.m function.

function dz = rhs_trajectory(z,g,F,F_d,m,gamma)

   x     = z(1);
   y     = z(2);
   v_x   = z(3);
   v_y   = z(4); 

   dx     = v_x;
   dy     = v_y;
   dv_x   = ((F-F_d)/m)*cos(gamma); %value F,F_d,m shall be sent by thrust_force.m,drag_force.m,mass.m and the the value drag_force shall be dependent on rho from density.m
   dv_y   = ((F-F_d)/m)*sin(gamma)-g;

   dz     = [dx; dy; dv_x; dv_y];

end

I attached other mfile for reference. Please enlighten me/

Answer 1

[darova]

The problem is in this line

[t, z] = ode45 (@(t, z) rhs_trajectory(z, g),...
                [0 tf], z0, opts);

Your rhs_trajectory function has several input paramaters. You are passing only two of them

function dz = rhs_trajectory(z,g,F,F_d,m,gamma)

[Hafizuddin Bin Mohd Lowhim]

Thank you for that. Now I amend the code as below. The rhs_trajectory has several input and I pass all of them to the ode45.

[t, z] = ode45 (@(t, z) rhs_trajectory(z,g,F,F_d,m,gamma),...
                [0 tf], z0, opts);

rhs_rajectory

function dz = rhs_trajectory(z,g,F,F_d,m,gamma)

I don't get the not enough input argument error anymore but all input which are F,F_d,m and gamma are not recognized variables or functions. Even though I have created them in respective functions. For example when I wrote thrust force in Command Window, they know it is a function.

help thurst_force
thurst_force is a function.
    F = thurst_force(mdot, Ce)

But I guess I have to ask this in seperate question. But thank you!

[darova]

you are welcome