Using ODE45 for first order diff equation with three different variables

조회 수: 15(최근 30일)
So, I am trying to use ODE45,
say dx/dt = (0.1*x)+(0.25*y)-(9.8*z)
I am trying to graph the behavior of x,y and z from time (0 to 100). What should i do to set up as in funciton file?
i tried
function dxdt = func(t,x,y,z)
dxdt = (0.1*x)+(0.25*y)-(g*z);
end
%main script
tspan = [0 100];
xint = 0;
yint = 0;
zint = 0;
[t,x,y,z] = ode45(func,tspan,xint,yint,zint);
But after i run this code i am getting an error says not enough input arguments.I am still adpoting the concept of using ode function but Please help!
I need to plot x,y,z from 0 to 100
  댓글 수: 1
Wan Ji
Wan Ji 2021년 9월 14일
Hi, you should have three equations for solving ode of x,y,z with respect to t. But you only provided one

댓글을 달려면 로그인하십시오.

채택된 답변

Wan Ji
Wan Ji 2021년 9월 14일
For example
function dxdt = func(t,x,g)
dxdt = zeros(3,1);
dxdt(1) = (0.1*x(1))+(0.25*x(2))-(g*x(3));
dxdt(2) = (0.1*x(1))+(0.25*x(2))-(g*x(3));
dxdt(3) = (0.1*x(1))+(0.25*x(2))-(g*x(3));
end
The main function
tspan = [0 100];
g = 10;
[t,x] = ode45(@(t,x)func(t,x,g),[0,100],[0;0;0]);
xsol = x(:,1);
ysol = x(:,2);
zsol = z(:,3);

추가 답변(0개)

태그

제품


릴리스

R2015b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by