MATLAB: I am trying to write this function for ode. But it always gives me an error as not enough input arguments. Here is the code associated:

Question

I am trying to write this function for ode. But it always gives me an error as not enough input arguments. Here is my code associated:

function dxdt = odefcn(x,a) 
dxdt = zeros(3,1); 
dxdt(1) = x(2); 
dxdt(2) = x(3); 
dxdt(3) =-a*x(3)+x(2)-x(1);
 end

Answer 1

Do not use

   ode45( odefcn, .....)

Use

ode45( @odefcn, .....)