Fourth order nonlinear DE solution where forcing function interpolation is known
显示 更早的评论
I want to solve the differential equation: 
, with BCs: 
(constant).
, with BCs: (constant). The function is not explicitly known, but I know its interpolation. I tried fitting a polynomial/exponential, but it I do not get a satisfactory fit. Please help!
3 个评论
Torsten
2023-5-21
I tried fitting a polynomial/exponential, but it I do not get a satisfactory fit.
What do you need help for ? Fitting f ? Solving the differential equation ? Show what you have done so far.
Mohammad Ansari
2023-5-21
John D'Errico
2023-5-22
Sorry. My approach does not apply to a nonlinear forcing term that is a function of the dependednt variable.
采纳的回答
You will have to use bvp4c, not ode45.
And interpolation in the function where you define the derivative function can be done via
fw_inter = interp1(w,fw,y(1))
where w and fw are your data vectors (w ordered) and y(1) is the value of w from bvp4c:
function dydx = bvpfcn(x,y,w,fw)
fw_inter = interp1(w,fw,y(1));
dydx = [y(2);y(3);y(4);fw_inter];
end
更多回答（0 个）
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 
