To know the units of t span used in ode45 command
조회 수: 16 (최근 30일)
이전 댓글 표시
I am using ODE45 command to solve 8 ordinary differential equations. My doubt is if im specifying tspan=[0 1000] , what will be the units of time like is it in seconds, minutes, hours?
code:
tspan=[0 1000];
yo=[1;2;3;4;5;6;7;8;9];
[tsol,ysol]=ode45(@filename,tspan,yo];
댓글 수: 2
James Tursa
2021년 7월 22일
The units of tspan is dictated by how you formulate your differential equation in the function handle. ode45( ) doesn't assume or know anything about units.
채택된 답변
Yongjian Feng
2021년 7월 22일
You can type this in the matlab command line window:
help ode45
to get help for ode45 function.
The first input argument is a function handler. This is the function that tells you what t means. In other words, whatever unit of t is used in the function handler, it is also used in the tspan.
Does it make sense?
Thanks,
Yongjian
추가 답변 (1개)
Steven Lord
2021년 7월 22일
There is no unit inherent to the t variable used by ode45. Just implement your ODE function correctly for your time units.
If you were modeling a predator-prey system using the Lotka-Volterra equations then your time units would probably be years.
참고 항목
카테고리
Help Center 및 File Exchange에서 Ordinary Differential Equations에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!