Got an error using ode45 - FUNC1 must return a column vector
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Script looks like this :
clear all
clc
x0=[7 10 13];
tspan=[0,10];
[t,x]=ode45(@func1,tspan,x0);
subplot(3,1,1);
hold on;
plot(t,x(:,1),'k');
subplot(3,1,2);
hold on;
plot(t,x(:,2),'k');
subplot(3,1,3);
hold on;
plot(t,x(:,3),'k');
and Function :
function xd = func1( t,x )
xd(1)=2*x(1)+3*x(2)-4*x(3);
xd(2)=-x(1)+2*x(2);
xd(3)=(-2)*x(1)+x(2)+2;
end
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Accepted Answer
Geoff Hayes
on 11 Jan 2015
Serbianu - the error message is telling you that the function func1 must return a column vector. From your code, the vector xd is a row vector. So just change this to a column vector as
function xd = func1( t,x )
xd = zeros(3,1);
xd(1)=2*x(1)+3*x(2)-4*x(3);
xd(2)=-x(1)+2*x(2);
xd(3)=(-2)*x(1)+x(2)+2;
end
In the above, we've added a line that just initialized xd as a column vector with three elements. Try making the change and see what happens!
(An alternative solution would be just to transpose the vector xd.)
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