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Constraints on dependent variables in PDE Toolbox
Hi Richard, I'm still not sure I'm understanding you so am not sure my "solution" will help but I'll explain it anyway. ...

plus de 12 ans il y a | 0

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Solving PDE w/ complex Neumann boundary condition
Hi, The expression within the single quotes has to be a valid MATLAB arithmetic expression. To define a complex number in MAT...

plus de 12 ans il y a | 0

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Solving PDE w/ complex Neumann boundary condition
Hi, Yes, PDE Toolbox allows the BC (or PDE) coefficients to be imaginary. Are you running into a particular problem? Bill...

plus de 12 ans il y a | 0

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Supporting documentation regarding PDE boundary files
Hi, Your question is certainly a reasonable one. The boundary matrix format in those files is unquestionably difficult to d...

plus de 12 ans il y a | 0

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Time Dependent Boundary Conditions in PDE Toolbox
Michael, Before commenting on your f-function, let me make sure I understand the situation. This issue is independent of your...

plus de 12 ans il y a | 0

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setting generalised Neumann boundary conditions in pdetoolbox when c is not 1
Hi, If I understand your BC correctly, >flux proportional to concentration you would like to set n*c*grad(u) (flux thr...

plus de 12 ans il y a | 0

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Time Dependent Boundary Conditions in PDE Toolbox
Hi Michael, It looks like you may have encountered a bug in the code. A work-around is to replace the line in your script th...

plus de 12 ans il y a | 0

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PDE Toolbox, Parabolic Heat Equation (2-D): How do I assign a start temperature (T=1000 K) to the whole rectangular area?
I assume you are trying to solve a transient heat transfer problem using the pdetool GUI and have set Option/Application to Heat...

plus de 12 ans il y a | 0

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(nonlinear) PDE problem domain internal boundary defined using mathematical expression
Hi, There are two issues you have to consider in constructing your model: # Defining the geometry that includes the subdom...

plus de 12 ans il y a | 0

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Solving reynolds equation for gas journal bearings
Hi, It looks like you want to solve the nonlinear version of the Reynolds equation. I believe that should be possible with PD...

plus de 12 ans il y a | 0

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How can I get different boundry conditions for the same geometry?
First let me make a comment about geometry construction in PDE Toolbox. C1+C2 says that you want to perform the analysis on a re...

plus de 12 ans il y a | 0

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Matrix coefficient in PDE toolbox for an elliptic equation
For pdetool GUI, the relevant documentation is here: <http://www.mathworks.com/help/pde/ug/coefficients-for-scalar-pdes-in-pdet...

plus de 12 ans il y a | 0

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Error with system of parabolic pdes
I should have also mentioned that the functionality to have coefficients that are functions of the solution (or gradients) in t...

plus de 12 ans il y a | 0

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Error with system of parabolic pdes
Hi, You've run into a PDE Toolbox bug that has been fixed for several releases. Is there any possibility that you can upgrad...

plus de 12 ans il y a | 0

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Error with system of parabolic pdes
Hi, I'm afraid you've run into a couple of PDE Toolbox idiosyncrasies. First, all coefficients must be column vectors (siz...

plus de 12 ans il y a | 0

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Time dependent boundary condition in PDE toolbox possible?
Hi, Defining boundary conditions to be functions of time is fairly straightforward. Neumann and Dirichlet conditions are hand...

presque 13 ans il y a | 0

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specifying the boundary conditions in pdepe
Hi, The equation you show is actually an ordinary differential equation with a single dependent variable u and a single inde...

presque 13 ans il y a | 0

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PDE Neumann boundary condition depends on u; qmatrix(u)
Yes, you have boundary conditions that are a function of u. That was not supported in PDE Toolbox for transient PDE (parabo...

presque 13 ans il y a | 0

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PDE Neumann boundary condition depends on u; qmatrix(u)
Hi, Are you by any chance using a version of MATLAB older than R2012b? The capability to have coefficients and boundary co...

presque 13 ans il y a | 0

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How to solve a system of Hyperbolic PDE of the second order using the function "hyperbolic" ?
Hi, I suggest you start by looking at this example: <http://www.mathworks.com/help/pde/examples/wave-equation-on-a-square-...

presque 13 ans il y a | 0

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Trying to use PDEPE function to solve a 1-d diffusion problem, I am getting a strange error...
Hi, The problem is with your boundary conditions at the right end (although I agree the error message doesn't make that part...

presque 13 ans il y a | 0

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PDE solver- help me match up with the template
Hi, Are you trying to solve this equation with the MATLAB function pdepe? Your equation is a classical convection equation, ...

presque 13 ans il y a | 0

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Calling/Manipulating functions created by PDEtoolbox GUI in the command window
Hi, The "function" file created by pdetool when you select the "Save As" option is really for the use of pdetool, only. It i...

presque 13 ans il y a | 0

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Solving one-dimensional PDE's using the PDE Toolbox
Hi, Solving a 1-D PDE with PDE Toolbox is fairly straightforward. You just define a rectangular region of the appropriate wi...

environ 13 ans il y a | 2

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How to get the u, ux and uy while solving a parabolic PDE?
Hi, Are you by any chance using a version of MATLAB older than R2012b? The capability to have coefficients in parabolic (and...

environ 13 ans il y a | 0

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Where can I find the best tutorials/texts on how to export a solution of a PDE equation created in PDE toolbox to the command window to fit equations which include the PDE solution to real data?
Hi Jeremy, I think I can at least point you in the right direction. There are a couple of PDE Toolbox functions you will p...

environ 13 ans il y a | 0

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Specifying du/dx in pde toolbox error
Hi, Everything you have done is correct. But, because of the ux term in f, you also have to check the "Use nonlinear solver"...

environ 13 ans il y a | 0

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Plot solution of pde toolbox on a line (or submanifold)
Hi, Here is one way to create such a plot. Assume you have the point matrix created by the PDE Toolbox mesher, p, and a solu...

environ 13 ans il y a | 1

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Is it possible to use non-constant Neumann boundary conditions with the parabolic pde solver?
Hi, You are definitely on the right track in assuming that creating a pdebound function is a good way to define this BC. I c...

plus de 13 ans il y a | 0

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two systems of coupled elliptic PDE
PDE Toolbox can solve nonlinear, elliptic PDE systems with an arbitrary number of dependent variables (i.e. systems with a rea...

plus de 13 ans il y a | 1

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