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Feb
4
awarded  Popular Question
Dec
16
awarded  Notable Question
Oct
30
awarded  Autobiographer
Oct
15
awarded  Popular Question
Feb
20
revised Numerical approximation of Levy Flight
Added Matlab code
Feb
12
comment Numerical approximation of Levy Flight
Hi @Asad Ali: the power law distribution is used to control the length of each step (always positive), but each step is in a random direction (see second paragraph in my question above), which produces a 2-d path. I will try to find some matlab code for you (but it might take a day or so!).
Jul
21
awarded  Yearling
Sep
22
accepted normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
Sep
22
awarded  Commentator
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
let us continue this discussion in chat
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
Brain and laptop both about to run out of batteries... thanks for your help anon - I'll have to try to work out the rest tomorrow.
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
I'm getting something like $(x^{-2},y^{-2},1)$...
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
@anon: um, $z+(x^2+y^2)^{-1/2}=0$, but it may take me several days to differentiate it... :)
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
Is it $\nabla F(a)=(\frac{\partial F}{\partial x},\frac{\partial F}{\partial y},\frac{\partial F}{\partial z})$?
Sep
22
comment normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
Ok, but how do I work out $\nabla F(a)$? Sorry, my maths is very rusty...
Sep
22
asked normal vector to surface $z=\frac{-1}{\sqrt{x^2+y^2}}$
Sep
13
accepted Name for $(1-x)$?
Sep
13
accepted Fitting an exponential function to data
Sep
13
awarded  Nice Question
Sep
12
comment Name for $(1-x)$?
@Rasmus: ...and what's the word to describe that property?