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How can I use an NxM matrix as intitial condition in 'pdepe' |
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| Goleo |
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Anmeldedatum: 28.05.19
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Verfasst am: 28.05.2019, 17:32
Titel: How can I use an NxM matrix as intitial condition in 'pdepe'
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I'm using the pdepe solver to solve 4 PDEs simultaniously. Now I want to use the solution as an initial boundary condition for a next step, e.g. u0(1,:)= sol(end,:,1) This works pretty well, as long as I just use a single value for the initial condition, e.g. u0(1)=sol(end,end,1), but fails as soon as I try the whole vector.
This seems to be in fact quite similar, but didn't work in my case: https://stackoverflow.com/questions.....nitial-condition-in-pdepe
[code]
sol = pdepe(m,...,@(x)icfun(x,sol)...
...
%icfun
u0=icfun(x,sol)
u0(1,:)=sol(end,:,1)
u0(2,:)=sol(end,:,2)
u0(3,:)=sol(end,:,3)
u0(4,:)=sol(end,:,4)
end
[code]
What didn't work, was the hint from the link above in the way I interpreted it.
[code]
A=sol;
a=sol(end,:,1);
sol = pdepe(m,...,@(x)interp1(a,A',x,'pchip')'....
[code]
I expected to be able to use a vector as an intial boundary condition for just one pde, what gives an NxM matrix for the 4 PDEs. Instead, an error occurs, stating that the initial boundary conditions needs to be a column vector.
'Error using pdepe (line 231) Invalid output of ICFUN. ICFUN must return a column vector.'
How is it possible to hand over the whole vectors instead of single values?
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