RK4 error for the code

2015 3 23
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Hi, I am integrating a differential equation using the code attached in the image.While i am executing my code i am getting the following error message,Can anyone help me with this.
??? Error using ==> feval
Argument must contain a string or function_handle.
Error in ==> rk4 at 21
k1 = h*feval(f,xo,u);

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Titus Edelhofer
Titus Edelhofer 2015-3-23

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Hi,
the error tells you, that the first argument to call rk4 should be a function that can be called, so either the name as a string (of a .m file), or a function handle.
Titus

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