ode45 help!!
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
I am trying to use the ode45 command, but I keep receiving error codes. I have changed so many things but I can not get it to work.
I want to plot the following:
- the position of the table and its velocity versus time for two or three periods.
- the velocity versus position.
Here is my current code along with the error messages:
function dx=project1(t,x)
m=20;
M=500;
k=50000;
l=2;
g=9.81;
wn=sqrt(4*k/(m+M));
T=(2*pi)/wn;
x0=-(m*g)/(4*k);
x0dot=-((m)/(m+M))*sqrt(2*g*l);
t=0:0.001:2*T;
xi=x0;
xidot=x0dot;
[t,x]=ode45(@project1, t, [xi xidot]);
figure;
plot(t,x(:,1));
xlabel('time');
ylabel('position');
figure;
plot(t,x(:,2));
xlabel('time');
ylabel('velocity');
function xdot=project1(~,x)
xdot1=x(2);
xdot2=-wn*wn*x(1);
xdot=[xdot1, xdot2];
end
end
----------------------------------------------------------------------------------------------------------------------
Error Message:
Error using odearguments (line 93)
PROJECT1/PROJECT1 must return a column vector.
Error in ode45 (line 115)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Error in project1 (line 23)
[t,x]=ode45(@project1, t, [xi xidot]);
0 Kommentare
Antworten (1)
madhan ravi
am 22 Sep. 2020
Just make the following changes in your code:
function dx = project
xdot = [xdot1; xdot2];
0 Kommentare
Siehe auch
Kategorien
Mehr zu Ordinary Differential Equations finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!