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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. ...

más de 10 años hace | 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...

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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...

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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...

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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...

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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...

más de 10 años hace | 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...

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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...

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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...

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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...

casi 11 años hace | 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...

casi 11 años hace | 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...

casi 11 años hace | 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...

casi 11 años hace | 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...

casi 11 años hace | 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...

casi 11 años hace | 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...

alrededor de 11 años hace | 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...

alrededor de 11 años hace | 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...

alrededor de 11 años hace | 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...

alrededor de 11 años hace | 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-...

alrededor de 11 años hace | 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...

alrededor de 11 años hace | 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, ...

alrededor de 11 años hace | 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...

alrededor de 11 años hace | 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...

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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...

más de 11 años hace | 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...

más de 11 años hace | 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"...

más de 11 años hace | 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...

más de 11 años hace | 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...

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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...

casi 12 años hace | 1

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