why i got this error?
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Unexpected error
function dFdx=funode(x,F)
global Lamda
global K1
global P
dFdx=[F(2) ; -K1*P+F(1)*Lamda^2];
function res=myfunbc(Fa,Fb)
global P
res=[Fa(1) ; Fb(1)-P];
solinit=bvpinit(linspace(0,l,2),[1 0]);
sol = bvp4c(@funode,@myfunbc,solinit);
x = linspace(0,l);
F = deval(sol,x);
After that i have an error The derivative function ODEFUN should return a column vector of length 2. why?
采纳的回答
James Tursa
2017-9-29
编辑：James Tursa
2017-9-29
Make it a column vector as requested:
dFdx=[F(2) ; -K1*P+F(1)*Lamda^2];
11 个评论
Nadim Mhanna
2017-9-29
James Tursa
2017-9-29
What about the other function:
res=[Fa(1) ; Fb(1)-P];
Nadim Mhanna
2017-9-29
编辑：Nadim Mhanna
2017-9-29
Steven Lord
2017-9-29
What is the size of each of the variables K1, P, and Lamda?
Nadim Mhanna
2017-9-29
编辑：Nadim Mhanna
2017-9-29
Walter Roberson
2017-9-29
Where is the value of P coming from in your lines
function res=myfunbc(Fa,Fb)
res=[Fa(1) Fb(1)-P];
You are not using the form of "function" that would allow P to be a shared variable.
Nadim Mhanna
2017-9-30
Nadim Mhanna
2017-9-30
Walter Roberson
2017-9-30
编辑：Walter Roberson
2017-9-30
When you use a global variable, it is not uncommon for the global variable to turn out to be empty at the time it is used.
Nadim Mhanna
2017-9-30
Jan
2017-9-30
@Nadim Mhanna: Please do not use flags to mark a "best answer". Flagging is thought to inform admins and editors, that a contribution needs attention, because it violates the terms of use, e.g. by rudeness.
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