How can i make my ODE graph make sense?
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Ian Samuelsson
le 18 Oct 2021
Commenté : Star Strider
le 18 Oct 2021
I don't know why my graph is like that ! I tried to plot the differential and the solved ODE but my graph dont make sense.
I'm trying to make a graph of a ODE about a ball dropping in oil, the values are all random, just to plot the thing
clear; clc;
clearvars;
syms t v(t) aa g p p1
aa = 5;
u = 3;
g = 10
p1 = 9;
p = 3;
v0= 0;
cond = v(0) == v0
eqn = diff(v,t) == (1-p1/p)*g-(9*u/2*aa^2*p)*v
vSol(t)= simplify( dsolve(eqn,cond) )
fplot(t,vSol(t),[0 10000]); hold on; grid on;
0 commentaires
Réponse acceptée
Star Strider
le 18 Oct 2021
The fplot call is incorrect, and the function declines so quickly that it’s not possible to see it clearly with a time interval going from 0 to 1E+5.
Correct those and it works!
syms t v(t) aa g p p1
aa = 5;
u = 3;
g = 10
p1 = 9;
p = 3;
v0= 0;
cond = v(0) == v0
eqn = diff(v,t) == (1-p1/p)*g-(9*u/2*aa^2*p)*v
vSol(t)= simplify( dsolve(eqn,cond) )
figure
fplot(vSol(t),[0 1E-2]); hold on; grid on;
.
8 commentaires
Star Strider
le 18 Oct 2021
The hold condition can be toggled on or off depending on whether other data are to be plotted to the same axes, or not.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Fluid Mechanics dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!