How do I solve 'Not enough input arguments'

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Khili Khamesra
Khili Khamesra 2018-2-27
编辑： Stephen23 2018-2-28
This is my code for solving the fick's equation. I am unsure as to what is my mistake. Any help is appreciated.
m=1;
xspan=linspace(0,30,300);
tspan=linspace(0,10,100);
sol=pdepe(m,pdefun,pdeinc,pdebound,xspan,tspan);
surf(xspan,tspan,u);
function [c,f,s]=pdefun(x,t,u,dudx)
c=1;
f=(0.02).* dudx ;
s=1;
end
function [uo]=pdeinc(~)
uo=1;
end
function [pl,ql,pr,qr] = pdebound(~,~,~,~,~)
pl=0;
ql=1;
pr=0;
qr=0;
end
I am getting the following error
Not enough input arguments.
Error in partialtrial>pdefun (line 14)
f=(0.02).* dudx ;
Error in partialtrial (line 9)
sol=pdepe(m,pdefun,pdeinc,pdebound,xspan,tspan);

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回答（1 个）

Walter Roberson
Walter Roberson 2018-2-27
sol=pdepe(m,@pdefun,@pdeinc,@pdebound,xspan,tspan);
  1 个评论
Khili Khamesra
Khili Khamesra 2018-2-28
Now I am receiving this error-
Error using pdepe (line 293) Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.
Error in partialtrial (line 9) sol=pdepe(m,@pdefun,@pdeinc,@pdebound,xspan,tspan);
the equation is clearly parabolic, what can be my mistake?

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