runge-Kutta problem command ode45
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Alvaro Mª Zumalacarregui Delgado
am 1 Mär. 2021
Kommentiert: Star Strider
am 1 Mär. 2021
I try to solve an equation with the command ode45 b ut I have an error, this is my code:
tspan = [0 5];
y0 = 100;
Q = 30, b = 0.2;
[t,y,x] = ode45(@(tspan,y,x) Q-b*x*y, t, y0);
plot (t,y,x,'-o')
and the error:
Q =
30
Not enough input arguments.
Error in rungrkutta_y>@(tspan,y,x)Q-b*x*y (line 4)
[t,y,x] = ode45(@(tspan,y,x) Q-b*x*y, t, y0);
Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ode45 (line 115)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Error in rungrkutta_y (line 4)
[t,y,x] = ode45(@(tspan,y,x) Q-b*x*y, t, y0);
how can I solve it?
0 Kommentare
Akzeptierte Antwort
Star Strider
am 1 Mär. 2021
I have no idea what you want to do, or what ‘x’ and ‘y’ are.
This will get you closer to an actual result:
tspan = [0 5];
y0 = [100; 0];
Q = 30;
b = 0.2;
[t,y] = ode45(@(t,y) [y(1); Q-b*y(1)*y(2)], tspan, y0);
figure
plot (t,y,'-o')
.
4 Kommentare
Weitere Antworten (1)
Stephan
am 1 Mär. 2021
tspan = [0 5];
y0 = 100;
Q = 30;
b = 0.2;
[t,y] = ode45(@(t,y)Q-b*t*y, tspan, y0);
plot (t,y,'-o')
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!