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Apr
24
comment How to draw a tropical surface?
Nikita, please see my updated answer. @belisarius, your method produces a blank plot for me. Can you explain what it's supposed to do? I don't usually see RegionPlots with equalities in them...
Apr
24
revised How to draw a tropical surface?
deleted 741 characters in body
Apr
23
awarded  Nice Answer
Apr
23
comment numerically solving
What's the problem with making a function that takes $\lambda$ as an argument and calls FindRoot?
Apr
23
comment Integrating a function over a surface integral
The literal implementation Integrate[1/Norm[Grad[e[x, y, z], {x, y, z}]], {x, y, z} ∈ ImplicitRegion[e[x, y, z] == ϵ, {x, y, z}]] seems to work when $E$ is given analytically, but not when it is an InterpolatingFunction constructed from the data.
Apr
23
comment Integrating a function over a surface integral
If I'm not mistaken, the integral is equal to $\displaystyle\frac{\mathrm d}{\mathrm d\epsilon}\iiint_{E(x,y,z)\le\epsilon}\mathrm dV$, is that right? It might be easier to compute that instead, but I'm not sure.
Apr
23
revised Integrating a function over a surface integral
added 17 characters in body
Apr
23
comment Creating a nonlinear phase portrait
I don't understand what the question is.
Apr
22
comment Something like MinDetect but for saddle points
Related (possible duplicate): Identifying critical points/lines of 2/3D image/cubes
Apr
17
comment How to ensure that Polygon[list] plots a simple polygon?
Some more possible solutions are given in the duplicate question Rebuild a polygon so it doesn't self intersect.
Apr
15
comment Plotting Riemann surface of $\sqrt{z}$ in rectangular coordinates
Sqrt will only give you one branch of the complex square root.
Apr
13
revised How to draw a tropical surface?
added 8 characters in body
Apr
13
revised How to draw a tropical surface?
added 2 characters in body
Apr
13
revised How to draw a tropical surface?
edited tags
Apr
13
answered How to draw a tropical surface?
Mar
26
comment Floating point arithmetic bug caused by Table[]
What Every Computer Scientist Should Know About Floating-Point Arithmetic
Mar
15
revised How can I make a 3D Plot with NDSolve?
added 30 characters in body
Mar
15
comment Stitch edge of disk to edge of square in 3D space (with deformations)
@djp: Given the example of paper cutouts, I assume that the deformation is meant to be isometric. See also: dForm
Mar
13
comment How to enhance a fuzzy image
A disk is a better model for defocus blur than a Gaussian function. Set r = 6; k = DiskMatrix[r]/Total[DiskMatrix[r], Infinity]; and try ImageDeconvolve[image, k, Method -> "RichardsonLucy"] or ImageDeconvolve[image, k, Method -> {"TotalVariation", "NoiseModel" -> "Laplacian"}]. The results aren't super fantastic, but they're something.
Mar
13
comment How to enhance a fuzzy image
Blurring is a form of convolution. To undo it, what you want is deconvolution, i.e. ImageDeconvolve. However, your image also has a lot of noise, which makes deconvolution very hard.