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Jun
20
awarded  Enlightened
Jun
19
awarded  Nice Answer
Jun
18
comment How to get this numerical solution of a integro-differential equation
Why not help Mathematica out a bit and see if you can turn your integro-differential equation into an ODE?
Jun
13
revised How to visualize the Gaussian curvature of a 3D surface using color?
improved versions of routines
Jun
12
awarded  Notable Question
Jun
10
comment How to make Poisson voronoi diagram
The output of RandomVariate[PoissonDistribution[(* stuff *)]] is an integer, right? That is the number of points you need to generate in the cell that number is associated with.
Jun
10
comment How to make Poisson voronoi diagram
You just cut the square into $n\times n$ smaller squares, for some $n$.
Jun
10
comment How to make Poisson voronoi diagram
The idea is relatively simple: in two dimensions, if you have a square region, split it into "cells", associate each cell with a Poisson-distributed random integer (call it $k$), and generate $k$ points in that cell with the coordinates drawn from a uniform distribution.
Jun
7
awarded  Nice Answer
Jun
5
awarded  Nice Answer
Jun
2
comment skewness and kurtosis - different definitions
Anyway, if you want, I can move this to the statistics SE site.
Jun
2
comment skewness and kurtosis - different definitions
We use Mathematica here, not Maple. (Maybe our site logo is not that readable?)
May
31
comment Some expectations of psi (digamma) function
It doesn't look to me that this has a closed form; you can try to derive a series by substituting in the series for the digamma function, however.
May
29
comment One point following another moving in a straight line?
I'll move this to math.SE, but to help you anyway: what you're interested in is called a pursuit curve.
May
27
comment If Q is an orthogonal matrix, does it follow that $QDQ^T = Q^TDQ$?
I really wish people would just try things out sometimes; it's not like failed experiments in mathematics will blow up in your face.
May
24
comment This one weird thing that bugs me about summation and the like
Well, Thiele expansion is the exact analog of Taylor expansion for continued fractions. In this case, instead of evaluating derivatives at your expansion point, you're evaluating reciprocal derivatives.
May
24
comment This one weird thing that bugs me about summation and the like
With respect to the continued fraction: you'll want to look up Thiele expansion and reciprocal detivatives.
May
24
comment Is university math all about proofs?
@John, I'll dispute that; sometimes they just have coffee instead.
May
22
awarded  Popular Question
May
16
revised Why is Cumulative “Density” wrong?
edited tags