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  1. Yes, it should be able to handle stiff PDE...

    Yes, it should be able to handle stiff PDE systems, since it uses implicit time step methods. If you want me to try a particular problem, send the details to me at sewell@utep.edu. Or you can...
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    Free Trial Version of PDE2D

    Linux, Windows and Solaris versions of PDE2D are now available at NO COST, which solve small to moderate size problems. They can be downloaded at:
    http://www.roguewave.com/pde2d#Trial

    The...
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    To verify that u(x,t) = sin(pi*x)*exp(-pi^2*t) ...

    To verify that u(x,t) = sin(pi*x)*exp(-pi^2*t) is the solution you just have to note that u_t = -pi^2*u and u_xx = -pi^2*u also, so it satisfies the PDE, and it is easy to check that it also...
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    Lazaro, Oh, ignore the e-mail I just sent you...

    Lazaro,

    Oh, ignore the e-mail I just sent you directly, I guess it is true that
    d(x)*d(y-1) = d(x,y-1), so if the coefficient of this were a constant,
    PDE2D could handle it. And even if it were...
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    Lazaro, I think you need to solve 2 separate...

    Lazaro,


    I think you need to solve 2 separate problems, on different rectangles, each with Uxx+Uyy=F, the first on with BC:

    Ux = 0 at x=0
    U = 0 at x=B (B = "infinity")
    Uy = 0...
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    I gather this question doesn't have anything to...

    I gather this question doesn't have anything to do with PDE2D, so maybe someone else at VNI can help her; I don't really understand what she's asking for...anyone?
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    PDE2D 9.2 Available

    PDE2D 9.2 has now been released. The most important new feature is a dramatic speed-up for the calculation of all eigenvalues of symmetric 1D and 2D eigenvalue problems. A list of new features is...
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    Sticky: New Video: PDE2D Overview

    I have created a 30-minute video which shows what PDE2D can do and how it is used:

    http://www.math.utep.edu/Faculty/sewell/pde2d/pde2d.htm

    This could benefit from a more professional...
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    PDE2D 9.1 Breakthrough in 3D Visualization

    PDE2D 9.1, now available here, features a breakthrough in visualization of 3D solutions.

    To see how easy it is now to use PDE2D to solve problems in a wide range of simple 3D regions, see the...
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    Dear Dr. Lin, I think I know what the problem...

    Dear Dr. Lin,

    I think I know what the problem is. I compiled the interactive driver without
    the -static switch, which means you have to have this library on your system to run the executable. ...
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    PDE2D with gfortran on Linux PCs

    The Linux PC version of PDE2D is now compatible with the GNU gfortran compiler as well as g77. gfortran is the replacement for g77, starting with the GNU Compiler Collection 4.0. The new PDE2D...
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    If you set RESTRT=.TRUE. and GRIDID=.TRUE., the...

    If you set RESTRT=.TRUE. and GRIDID=.TRUE., the solution is dumped at the nodes into the restart file 'pde2d.res', and then read back in the next run, so it is essential that the FEM grid...
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    When the collocation FEM is used, the Jacobian...

    When the collocation FEM is used, the Jacobian matrix will normally have some zero diagonal elements, so that is not surprising. And the non-zero structure of the collocation matrices is...
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    Problem with RUNPDE2D, Intel Fortran version

    A recent customer, who purchased the Windows/INTEL Fortran version of PDE2D, reported that he successfully ran the GUI, but when he tried to execute RUNPDE2D on the resulting file, he received the...
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    You need to reference the temperature in F1 as...

    You need to reference the temperature in F1 as "temper(x,y,z)" and then
    write a Fortran function temper which interpolates your array to the point
    (x,y,z). I have written a function which does...
  16. If you use finite differences or finite elements...

    If you use finite differences or finite elements to solve a problem like
    Ut = Uxx (+ Uyy + Uzz)
    you will end up having to solve an ODE system of the form:
    Ut = AU
    where A is a matrix, with...
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    Linux and Solaris versions ready

    The Linux and Solaris versions (of PDE2D 9.0, with the new GUI) are now ready also, the GUIs can be downloaded from:

    www.vni.com/products/affiliated/PDE2D_ProductPage.php
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    PDE2D 9.0 (with GUI) Ready

    The Windows versions (compatible with the LF90 and Intel Fortran compilers) of PDE2D 9.0 are now available, see

    www.vni.com/products/affiliated/PDE2D_ProductPage.php.

    The Linux and Sun...
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    Well, we do have a 64-bit Linux version (that...

    Well, we do have a 64-bit Linux version (that actually includes both 32 and
    64 bit libraries, I run both versions on my own Linux PC at the same time),
    you can purchase it now at...
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    I believe the only version at release 8.4 I...

    I believe the only version at release 8.4 I offered other than the source
    code license was the Windows/LF90 version (though I could be mistaken,
    this isn't Linux/g77 is it?), and if you had the...
  21. general comments on comparisons

    Some general comments on comparisons.

    I believe you have correctly listed all the serious competitors of PDE2D: PDE Toolbox (a MATLAB toolbox), COMSOL'S FEMLAB and FLEXPDE. I don't believe there...
  22. Further comparisons

    The NAG and IMSL libraries are general-purpose mathematical libraries and would not be expected to compete with a special purpose PDE solver for general problems. Neither has the ability to solve 2D...
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    PDE2D on Red Hat Linux

    A new customer installed the Linux version (tested on SUSE Linux) of PDE2D on a PC with Red Hat Linux, successfully, with two minor problems.

    1. The libraries libX11.so and libXt.so which PDE2D...
  24. comparison with PDE Toolbox

    You mentioned COMSOL; I'm not sure if you are referring to Comsol's MATLAB PDE Toolbox, or their FEMLAB program, or both. Since the PDE Toolbox is more in PDE2D's price range (if you include the...
  25. comparison...

    I am not aware of any published comparisons.

    PDE2D is not a new product, it was sold by IMSL, Inc (now VNI) from 1980-1991 under the names TWODEPEP and PDE/PROTRAN, and during that time period I...
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