Boundary Value Problem error bvp4c

1 次查看（过去 30 天）
Moustafa Aboubakr
Moustafa Aboubakr 2017-4-23
评论： Moustafa Aboubakr 2017-4-24
I am trying to solve a differential equation using the bvp4c function (using boundary value conditions) but i always get the error "In an assignment A(:) = B, the number of elements in A and B must be the same. " i dont know why this error happens ?
init = bvpinit(linspace(0,2,10),[0 0 0]);
sol = bvp4c(@Kpath1,@bcpath,init);
t = linspace(0,2,100);
BS = deval(sol,t);
plot(t,BS(1,:))
function bv = bcpath(L,R)
bv = [L(1) L(2) L(3)-1.2; R(1)-2 R(2)-2 R(3)-1.2];
end
function dt = Kpath1(~,c)
L = 0.12;
r = 0.1;
WL = 0.25;WR = 0.25;
x = c(1);y = c(2);th = c(3);
dx = (((r*WL)+(r*WR))/2) * cos(th);
dy = (((r*WL)+(r*WR))/2) * sin(th);
dth= ((r*WR)-(r*WL))/L;
dt = [dx;dy;dth];
pose = [x y th];
end
Thanks in advance

请先登录，再回答此问题。

采纳的回答

Torsten
Torsten 2017-4-24
You need to return a 3x1 vector instead of a 2x3 matrix in "bcpath".
Best wishes
Torsten.
  3 个评论
显示 1更早的评论
Torsten
Torsten 2017-4-24
Seems you'll have to use "pdepe" instead of "bvp4c".
Best wishes
Torsten.
Moustafa Aboubakr
Moustafa Aboubakr 2017-4-24
Thanks, but i converted the system of equations from dydt,dxdt into dydx ad dtheta/dx and bvp4c worked fine :) I didnt understand the concept of bvp correctly thnaks again

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Boundary Value Problems 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by