Problem in ode15s, undefined function for input arguments of type double

Question

John Delis 2016-11-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/313312-problem-in-ode15s-undefined-function-for-input-arguments-of-type-double

回答： Walter Roberson 2016-11-21

在 MATLAB Online 中打开

I am trying to use ode15s on a time-variant dynamic system. When i try to run my script i get the following error:

Error using feval

Undefined function 'leading_vehicle.m' for input arguments of type 'double'.

Error in odearguments (line 88)

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

Error in ode15s (line 149)

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

Error in simulation (line 3)

[t, q_i_1]=ode15s('leading_vehicle.m', tspan, leading_initial);

The function leading_vehicle.m is in the current directory of matlab, so thats definitely not the case of my problem. My code is the following:

function Dq = leading_vehicle( t, q )
  Dq=[u(t)*cos(q(3)); u(t)*sin(q(3)); (1/a)*tan(g(t))*u(t)];
end
    function fa=u(t)
        fa=t;
    end
    function fb=g(t)
        fb=0*t;
    end

tspan=[0 20];

leading_initial=[3; 0; 0]; %initial conditions of leading vehicle

[t, q_i_1]=ode15s('leading_vehicle.m', tspan, leading_initial);

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David Goodmanson 2016-11-21

Hi John, aside from a possible misspelling error, looks like Matlab can't find the function either on the Matlab path or in the current directory. Have you tried, just before your ode15s call, "cd" and "dir *.m" ?

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