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how about removing some of the restriction on the free player input?
I just wrote a demo to help show how fast the sparse array linear solver in Mathematica 7 is by using it to directly solve a 2D Poisson PDE by finite difference method on a unit square with arbitrary Dirichlet boundary conditions on the 4 sides of the square. One can select the grid size and the boundary conditions, and the forcing functions, and the numerical solution is displayed in 3D. It is a very fast solver, and RAM requirments are kep low, even if the grid size gets too large, thanks to Mathematica sparse arrays. I also have made other demos using iterative solvers. The problem is that one can't type in any forcing function they would like to use for the RHS of the pde, since Keyboard entry to text fields is not allowed in the free player http://www.wolfram.com/solutions/interactivedeployment/compare.html This means the author of a demo has to pre-define few typical forcing functions and the user will have to select which one to use out of these only. Any parameters to use in the definition of the function, needs to have slides for them to allow on to choose the values. This is all very restrictive, since it will not allow the user to experiment more by typing any other function they want to try. It will be much easier and better if the user just typed in the function they want. If the input is invalid, ok, it is a user fault, they will try again to enter a valid Function according to Mathematica syntax. The point is, having no text field for entry makes writing more useful and more educational demos less interesting. Is it possible to remove this restriction at least from the free player? Otherwise, the demo I wrote is not going to be too much useful if the user can only select few predefined forcing functions to use. I know WRI wants to sell more pro-player copies and that is why they have this restriction on the free player, but If WRI wants to make the demo project more useful, and make Mathematica more popular, they should remove such restrictions on the free player. Thanks, --Nasser