Beantwortet
Lack of Boundary Conditions to solve PDE (using pdepe function)
In your original code, set your boundary condition function to this: pl = [ul(1); 0]; ql = [0;1]; pr = [pi*exp(-t); 0...

mehr als 8 Jahre vor | 0

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Solve a system of Partial Differential Equations using function BVP4C
It looks to me like you have 9 dependent variables and only 7 equations and boundary conditions. Clearly, that can't be solved....

fast 9 Jahre vor | 1

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Solving 4th order PDE
You may be able to solve this in pdepe with two equations and two dependent variables h and P. The first equation would be your ...

etwa 9 Jahre vor | 0

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Why bvp4c not works?
I think you want: dydt=@(x,y)[y(2); (x-2*y(2))/3];

mehr als 9 Jahre vor | 0

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How to formulate boundary conditions for a PDE system?
pdepe is specifically designed for PDEs that are second-order in the spatial direction. That is why it requires you to specify b...

mehr als 9 Jahre vor | 0

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Using pdepe for 1d transcient heat conduction through a composite wall
You want to model this multi-region wall with a *single* pde and then write your pde function (pdefun) so that it returns a d...

fast 10 Jahre vor | 1

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Beantwortet
Spatial discretization has failed. Discretization supports only parabolic and elliptic equations, with flux term involving spatial derivative.
I see two problems. First, your boundary conditions are incorrectly defined. They should be: pl = [ul(1);ul(2);ul(3);ul(...

fast 10 Jahre vor | 0

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Beantwortet
How to solve a nonlinear Parabolic PDE IBVP
Since the problem is 1D, you can use the pdepe function.

fast 11 Jahre vor | 0

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Beantwortet
pdepe: why does spatial discretization fail?
I think you want the following in your pdebc function: function [pl,ql,pr,qr] = pdebc(xl,ul,xr,ur,t) pl = ul-0.3639; ...

fast 11 Jahre vor | 1

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Beantwortet
PDE Toolbox solution array along a line, to then find the mean value
The evaluate function is returning only one value because the length of your x and y vectors is one. Maybe you want something l...

etwa 11 Jahre vor | 1

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Beantwortet
Exchange Problem with PDEPE solver
Torsten said: "Usually, if e.g. material properties change at the interface, the transmission conditions are continuity of te...

etwa 11 Jahre vor | 0

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Spatial discretization has failed. (pdex1)
That error message is somewhat misleading. There are two problems in your code. The first is that your boundary condition fu...

etwa 11 Jahre vor | 0

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How to solve second order partial differential equations ?
This problem is straightforward to solve using PDE Toolbox. I suggest you look at this example <http://www.mathworks.com/help/p...

etwa 11 Jahre vor | 2

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elliptic PDE with variable coefficient
The input arguments, x and y are equal length row vectors of x and y coordinates where the a coefficient must be defined. If t...

etwa 11 Jahre vor | 0

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How to increase the size of "s" using pdegeom?
If your concern is about producing a nice looking plot from pdegplot, you will need to edit that function by changing the line:...

mehr als 11 Jahre vor | 0

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Beantwortet
Interpolation of data defined on triangular mesh
If you have access to the R2014b version of MATLAB, there is a new PDE Toolbox function, pdeInterpolant, that makes this operat...

mehr als 11 Jahre vor | 1

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Beantwortet
Nonlinear Heat Transfer In a Thin Plate - bug in example?
What version of MATLAB are you running? The documentation page you are pointing to is for the R2014b version of MATLAB. The ...

mehr als 11 Jahre vor | 0

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Applying Nonconstant Boundary Conditions for pde
The pdeGeometryFromEdges function is part of a new, simpler approach to defining boundary conditions in PDE Toolbox introduced ...

mehr als 11 Jahre vor | 0

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Beantwortet
Solving an Hamilton Jacobi Bellman equation type /w nonlinear coefficients
Hi Matt, You *can*, in fact, express your equation in a form that the parabolic function in PDE Toolbox will accept. The ...

mehr als 11 Jahre vor | 1

Beantwortet
1D diffusion-reaction model across two-layered slab using pdepe
I am doubtful that pdepe can be used to solve this system. I suggest using finite differences to discretize in the spatial di...

mehr als 11 Jahre vor | 0

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