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14h
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
Jan
11
comment Order of evaluation - does Mathematica evaluate variables before or after substitution?
Each symbol can have a value associated with it or not. When you write y=x^2, then later on, write x=10, then y now automatically becomes 100 since it was pointing to x before, but now x has a value which is 10. There is no explicit evaluation of y. It is done automatically. It is all linked lists. If a symbol x has value other than itself, then its value is used automatically when looking up y.
Jan
11
comment How to fill in missing points on a graph?
If you add PlotTheme -> "Classic" then you will not notice this.
Jan
11
comment What's is the restrictions for the function MatrixExp?
from help works only on square matrices. So as long as the matrix is square, it will work.
Jan
11
comment Plotting x^(1/3)
(-8)^(1/3)=-2, How did you get this? it is complex number?
Jan
10
revised two element ticks in a parametricplot
cleaned