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Jul
2
revised Distribution of 10 points within a unit square
you want to maximize, not minimize
Jun
27
comment Colouring of multiple data sets in DiscretePlot
Possible duplicate: mathematica.stackexchange.com/q/1731/484
Jun
25
comment Fitting points to tilted, off-center ellipse
You said in your comment that "this worked far better than a direct 5 parameter fit" in your experience. Can you elaborate a little on why that might be, or in what cases would this approach work better than the simpler direct fit?
Jun
21
comment How to improve visualisation of trajectories in 3D space
Do you specifically care about the trajectories or just the positions?
Jun
19
comment Drawing pairs (graph, circle packing)
No no, I was just curious if it was the same or whether there was some subtlety that I missed.
Jun
18
comment Drawing pairs (graph, circle packing)
I wonder if this is the same as the algorithm described in the Wikipedia article which is the first link in the question?
Jun
18
comment Obtaining the envelope of an oscillating function and perform fitting
Pretty sure the envelope of your function is just E^(-10 Abs[t]) Abs[Cos[q t/2]].
Jun
18
comment How to create these famous surfaces in topology with the desired color effects?
Do you really expect people to go through a zip file containing dozens of PDFs to find the definitions of the surfaces needed to answer your question?
Jun
17
revised How to create these famous surfaces in topology with the desired color effects?
formatting, typos, link
Jun
16
comment How to create these famous surfaces in topology with the desired color effects?
The reflection effects require either ray tracing or, for a cheaper approximation, environment mapping. As far as I know, Mathematica supports neither out of the box; all you get in Graphics3D rendering is Gouraud shading.
Jun
15
comment How to get UV mapping of 3D tube
The unwrapped 2D positions of the points are already the UV coordinates, aren't they?
Jun
15
comment Smooth Peter de Jong attractor
The first image you showed is made with 12 million points. They do not keep all the points in memory; whenever each point is computed they just set the corresponding pixel location in the image and move on. This way they don't need gigabytes of storage.
Jun
12
reviewed Edit suggested edit on NDSolve gives wrong results for “stiff system”
Jun
12
revised NDSolve gives wrong results for “stiff system”
correct some typos
Jun
10
revised Smooth 4D (3D + color) plot from discrete points
reverting to original title
Jun
10
comment What is wrong with my simple plot?
Minimum change required to make the plot work: Replace I0 .03 with I 0.03. Should we close the question as typographical error?
Jun
10
comment What is wrong with my simple plot?
@user14782: If you plot Im[y] /. sol[[1]] for example, you will see that it is not a constant graph, the variation is just very small.
Jun
10
comment How do I interrupt (abort) a computation in Mathematica?
I know this isn't the point of the question, but... Table[(n - 1)!, {n, 1, 10}] :)
Jun
9
comment Maximization of a 3-variable function
At first I thought Mathematica was being defeated by the presence of Max. So I took them out and tried h[x_, y_, z_] := y (a - z) - z (a - t) + (y + x) (b - (y - z) - x + 1); Maximize[{h[x, y, z], 0 <= z <= t && z <= y <= a && 0 <= x <= b - (y - z)}, {x, y, z}], just to see if it would work. Now it's been chugging away for an hour with no result.
Jun
9
comment 3D Plotting with PieceWise function
You need to combine the conditions with And instead of making a list. Piecewise[{{x + y, y <= -x + 1 && x >= 0 && y >= 0}, {(x + y)^2, True}}] will do.