ode45 Initial conditions are not at the same point
显示 更早的评论
Hello everybody, I'm using ode45 to solve some easy differential equations.
Here are the equations that I have:
For now, I have the initial conditions:
As you can see, the initial conditions are in not the common case, which may look like:x(4)=a;y(4)=b;
The value of x and y gets from different point.
Any suggestion on the set of initial values for ode45?
Thank you in advance!
Meredith
采纳的回答
madhan ravi
2018-11-24
2 个投票
5 个评论
Yijia Liu
2018-11-25
The ODE solvers work with one arrays for the solution variables (e.g. z), not with multiple single expressions (x,y). So for both ODE45 and BVP4C you will have to rename your variables as
x=z(1), y=z(2)
e.g.
And BVP4C is the adequate tool to solve your exercise.
madhan ravi
2018-11-26
Thank you Torsten :)
Yijia Liu
2018-11-28
madhan ravi
2018-11-28
Anytime :) if you find the answer helpful and it answered your query make sure to accept the answer
更多回答（1 个）
Pasindu Ranasinghe
2021-7-22
Example Code
Use ode45() to find the approximate values of the solution at t in the range of 1 to 3
function ydot = eqns(t,y)
ydot=(t-exp(-t))/(y+exp(y));
end
###################################
%%Code
[t1,y1]=ode45(@eqns,[1.5 1], 0.5);
hold on;
[t2,y2]=ode45(@eqns,[1.5 3], 0.5);
hold off
t=[t1;t2];
y=[y1;y2];
plot(t,y,'-o')
HOPE YOU FIND THIS USEFULL
类别
在 帮助中心 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
