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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:

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Sam17
Sam17 2017-9-2
评论： Sam17 2017-9-2
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

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Walter Roberson
Walter Roberson 2017-9-2
Do not use
ode45( odefcn, .....)
Use
ode45( @odefcn, .....)
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Walter Roberson
Walter Roberson 2017-9-2
a=2
tspan = [0 5];
X0 = ones(1,3);
[t,x] = ode45(@(t,x) odefcn(x,a), tspan, X0);
figure;
plot(t,x);
grid on;
with
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

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