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Dec
18
comment Plot region from given coordinates
Why is it a problem if the FindShortestTour solution is not convex?
Dec
17
awarded  Revival
Dec
17
answered Limits explanation in doc
Dec
17
comment Plot region from given coordinates
See also How to ensure that Polygon[list] plots a simple polygon? and Rebuild a polygon so it doesn't self intersect
Dec
15
comment Interpreting the result of ContourPlot3D
Fundamentally this is because the ContourPlot* functions rely on the intermediate value theorem, which breaks down here because the function is not continuous.
Dec
14
comment Why doesn't Mathematica show up in OS X Spotlight?
I used to have the same problem. I deleted the Spotlight cache, which forced it to reindex the system, and that fixed it. You should try bill s's solution, which seems like a more non-violent way of doing the same thing.
Dec
14
comment How to Handle Infinity in calculations?
That sounds like a bad idea...
Dec
13
comment Plot a parametric function from $\mathbb{R}^2$ to $\mathbb{R}^2$
Can you post the function in Mathematica code? Look up Piecewise if needed.
Dec
13
comment Replacing Tan[x] with Sin[x]/Cos[x]
I don't know if this is what you're looking for, but (1 - Tan[x])/(Sin[x] - Cos[x]) // Simplify gives -Sec[x].
Dec
12
reviewed Reject and Edit Finding center of mass in a 2D array
Dec
12
revised Finding center of mass in a 2D array
added 1168 characters in body
Dec
11
comment Generate random Hermitian matrices
Alternatively, generate a random matrix $A$ and take $\frac12(A+A^\dagger)$.
Dec
11
comment How to restore some upset of pictures
@J.M.: If the solutions for that question work for this one, then yes. I haven't tested them, so I don't know.
Dec
11
comment How to restore some upset of pictures
Related: Reconstruct text pages cut by shredder
Dec
9
comment How can I use Kenneth Moreland's “Diverging Color Maps for Scientific Visualization” in plots?
The built-in "ThermometerColors" is pretty similar, though zero is slightly yellowish rather than a neutral grey.
Dec
9
comment StreamPoints adding extra information
In other words, you want the red streamline to only be traced forward and not backward from the point $(0,2)$?
Dec
9
revised 3D-plot region between two curves
inlined image
Dec
9
revised Is there a Graphics primitive for a cone without a base?
more compatible with Cone[] syntax
Dec
8
answered Is there a Graphics primitive for a cone without a base?
Dec
8
comment Fourier Series and epicycles - How to find the radii and angular velocities from a function's Fourier Series expansion
That's because its period is not $2\pi$. Try plotting $(2\sin 2t, \sin 3t)$.