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Jan
9
revised Is there a way to characterize a winding object in an image?
added 240 characters in body
Jan
9
revised Is there a way to characterize a winding object in an image?
added 240 characters in body
Jan
9
answered Is there a way to characterize a winding object in an image?
Jan
8
revised What happens when you divide by ##?
made code easier to copy-paste, see http://meta.mathematica.stackexchange.com/a/1028/484
Jan
8
comment Ploting a topology that accepts saddle point in 3 dimensional plot
"It means the question was not that bad." No, look at what I said: The question is very hard to understand. Just because I managed it after a fair bit of effort and luck does not mean that it was not hard.
Jan
8
answered Ploting a topology that accepts saddle point in 3 dimensional plot
Jan
6
comment Simplify binary expressions
Nice solution! I wanted to try it on other examples, so I took the liberty of packaging it into an easier-to-use function and adding it to your answer. I hope you don't mind; feel free to roll back the edit if you don't want it.
Jan
6
revised Simplify binary expressions
functionalized
Jan
6
comment Simplify binary expressions
This is a neat approach, but it thinks the solution to a + b + c == 3 is {a + b + c == 1}.
Jan
5
comment Showing separate surfaces
This seems to have turned into yet another completely different question.
Jan
3
answered How can I calculate the perimeter of an equation-defined curve?
Jan
3
comment How to plot an implicit value funtion
You could make a ContourPlot of the zeroes of the $y$-derivative, like in this previous question.
Jan
2
answered How to plot this region?
Jan
2
comment Problem with ContourPlot [Not smooth curve]
I'm not sure. Maybe one of the other solutions in your previous question doesn't have this problem?
Jan
2
comment Problem with ContourPlot [Not smooth curve]
The problem is because of the post-processing you are applying to the contour lines. The lowermost "line" is actually two Line primitives which are individually being reflected.
Jan
2
comment How to plot this region?
ParametricPlot[{u.a.u, u.b.u}, {θ, 0, 2 π}]
Dec
31
comment List Contour Plot: Delete some contour lines, but keep the colors
You could also Show a ListContourPlot with just the contours you want (and ContourShading -> None) on top of a ListDensityPlot.
Dec
31
comment List Contour Plot: Delete some contour lines, but keep the colors
"ContourStyle → $\{g_1, g_2, \ldots\}$ specifies that successive directives $g_i$ should be used to draw successive contours." So, for example, Contours -> {0, 0.1, 0.2, 0.5}, ContourStyle -> {Black, None, None, Black}.
Dec
30
comment Moving polygon on path curve to create 3D shape
@Yves: Perhaps one could edit the previous question to optionally request an arbitrary cross-section. (That wouldn't invalidate the rest of the existing answers.)
Dec
27
comment Random real numbers that sum up to specific value
See also Random numbers that add to 100, which has some nice plots that illustrate how the different strategies behave. Also an equivalent question on the statistics site: Generate uniformly distributed weights that sum to unity?