Nasser
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 Mar 21 asked Using DirectoryQ difference with windows and Unix naming, forward slash problem Mar 21 comment Can one license be used on a dual-boot machine? This was asked before same-mathematica-9-1-student-license-on-both-ubuntu-and-windows-7 Mar 18 comment Differential equation and For loop in Mathematica But you wrote For[u == 1, u <= 1, so how do you expect this to run 11 times? try may be For[u = 0, u <= 1..... (note also difference between = and ==). These are not the same in Mathematica. see help on reference.wolfram.com/language/ref/For.html also better to use Do if you need to make explicit loops. Mar 18 revised unhandled win32 exception in WolframKernel.exe in DSolve of non-linear ODE in one variable added that bug still there in 10.4 Mar 15 awarded Favorite Question Feb 10 awarded Nice Question Feb 6 awarded Nice Answer Feb 6 comment Problems with QueueingNetworkProcess Your code is not valid actually. You are calling the function using shoppingProcess[s_]. This should be the definition of the function, not in the call. In the call, do not use _ on the argument. Feb 6 comment Fourier-style solutions to differential equations, not piecewise polynomials I do not understand the problem. Can you show an example where you could not differentiate InterpolatingFunction returned from NDSolve? But you could always find the Fourier series approximation of the InterpolatingFunction returned If this is what you want. It will not be any better than piecewise polynomials, due to Gibbs phenomenon to start with. Jan 31 comment Non Standard Eigenfunction Plots of the Laplacian Over the Unit Square fyi; Here is a demo that also plots the modes demonstrations.wolfram.com/VibrationOfARectangularMembrane Jan 31 answered Symbolic derivatives and substitution Jan 31 comment Symbolic derivatives and substitution What you say should be the result is actually wrong. Try D[x h[x, y], {x, 2}] to see. btw, it might be easier just to make a function. r[expr_] := D[expr, {x, 2}]; then you can do r[f[x, y]] and r[x h[x, y]] Jan 31 comment How to plot points in 2D without restricting their apparent positions to pixel grid? You also defining a function use =. This should really be =:. Jan 31 comment How to plot points in 2D without restricting their apparent positions to pixel grid? There is no difference. Both "vibrate" the same way. Try this to see it better Manipulate[ Row[{ Graphics[ {PointSize[Large], Point[{0, x[t]}]}, PlotRange -> {{-0.1, 0.1}, {-0.1, 1.1}}, Axes -> False, ImageSize -> 50], Graphics3D[{PointSize[Large], Point[{0, x[t], 0}]}, PlotRange -> {{-0.1, 0.1}, {-0.1, 1.1}, All}, Boxed -> False, ImageSize -> 50, ViewVector -> {0, 0, 10^4}] }], {{t, .1, "time"}, .1, 100, .1, Appearance -> "Labeled", ContinuousAction -> True}, ControlPlacement -> Left, Initialization :> ( x[t_] := Abs@Sin[t]/t ) ] Jan 28 awarded Nice Question Jan 17 awarded Yearling Jan 17 comment What are some “real-world” applications of Mathematica? Related question has answers here mathematica-application-in-real-life Jan 17 comment What are some “real-world” applications of Mathematica? Wolfram alpha is a real world application written in Mathematica: The secret weapon that has allowed us, and no one else, to assemble such a vast library of algorithms, in such a diverse range of fields, is Mathematica. from the-secret-behind-the-computational-engine-in-wolframalpha also half of Mathematica itself is written using Mathematica. I think about 50% is C/C++ and the other half is in Mathematica. This might have changed in recent versions. I remember reading this sometime ago. Jan 12 answered How to extract the elements which the require the second elements to be the smallest? Jan 12 awarded Nice Question