Answered
Error in solving system of two reaction-diffusion equations?
The flux term in your pdex4pde function doesn't match the equations you show in your attached pdf. Assuming the pdf is correct,...

3 years ago | 0

Answered
How can I solve an ODE when F(x0)=F'(x0)=0 is given at an unknown point x=x0 using bvp5c?
You have a second order ODE so you need two boundary conditions. The term "boundary condition" implies that you know the locatio...

3 years ago | 0

Answered
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...

3 years ago | 0

Answered
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....

3 years ago | 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 ...

4 years ago | 0

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

4 years ago | 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...

4 years ago | 0

Answered
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...

4 years ago | 1

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Answered
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(...

5 years ago | 0

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

5 years ago | 0

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Answered
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; ...

5 years ago | 1

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Answered
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...

6 years ago | 1

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

6 years ago | 0

Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 2

Answered
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...

6 years ago | 0

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Answered
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:...

6 years ago | 0

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Answered
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...

6 years ago | 1

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Answered
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 ...

6 years ago | 0

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

6 years ago | 0

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Answered
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 ...

6 years ago | 1

Answered
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...

6 years ago | 0

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