Error using FEVAL and odearguments

What does this mean and what could be the possible reasons behind it?

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??? Error using ==> feval Undefined function or method 'pitch_fn.m' for input arguments of type 'double'.

Error in ==> odearguments at 98

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

Error in ==> ode45 at 172

[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...

Error in ==> pitch_model1 at 41

[t,y] = ode45('pitch_fn.m',time , [q(1) q(2) q(3) qdot(1) qdot(2) qdot(3)] );

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I have ensured that both the script and function are in same folder. But i cant figure out any reason for the undefined function and errors below it.

I am trying solving ODE ( 2nd order, three variables) through ode45.

[Jan]

Which script and which function are in which folder? Is this folder included in Matlab's PATH?

[Puru]

pitch_model1.m is the script and pitch_fn.m is the function . They are in the folder, Pitch_model, and yes the folder is included in Matlab's path.

Answer 1

[Walter Roberson]

Do not include the ".m" in the function name.

[t,y] = ode45('pitch_fn', time , [q(1) q(2) q(3) qdot(1) qdot(2) qdot(3)] );

Even better if you do not have a fairly old MATLAB is to use function handles:

[t,y] = ode45(@pitch_fn, time , [q(1) q(2) q(3) qdot(1) qdot(2) qdot(3)] );

[Puru]

Thank you, it worked!!