Hello, Writing to you with a problem… I am trying to figured out this for many hours already and still no clue where is the problem:
My code:
l=linspace(0,L,100);sol0=bvpinit(l,@funinit);sol=bvp4c(@ODE,@bc,sol0);R=deval(sol,l)';tm=R(:,1)tg=R(:,2)um=R(:,3)function y=funinit(x)global tm0 tk L tgk tg0y=[ tm0-(tm0-tk)*x./L;tgk-(tgk-tg0)*x./L;3];function dydx=ODE(~,y)global g CD ug0 rom rop dp Wm cm Wp cwp cwm alfa tm=y(1); tg=y(2); um=y(3);dup=g-0.75*CD*(um-ug0)*(um-ug0).^2*rop./(dp*rom)./um;dtp=-1.75*alfa*(um-ug0)*(tm-tg)./(dp*rom*cwm)./um; dtg=dtp*Wm*cm./(Wp*cwp); =dydx=[dtg; dtp; dup];function y=bc(yb,yc)global tm0 tg0 uczy=[yb(1)-tm0yc(2)-tg0yb(3)-ucz];
Matlab error: Error using bvparguments (line 108) Error in calling BVP4C(ODEFUN,BCFUN,SOLINIT): The derivative function ODEFUN should return a column vector of length 3.
Error in bvp4c (line 130) bvparguments(solver_name,ode,bc,solinit,options,varargin);
Error in Roma5a (line 43) sol=bvp4c(@ODE,@bc,sol0);
Best Answer