381 reputation
19
bio website
location Universidade de São Paulo, Brazil
age 29
visits member for 2 years, 4 months
seen Mar 21 '13 at 20:24

I am currently a post-doc at the Physics department at the University of Sao Paulo. My interests are in Statistical Physics, stochastic processes and magnetism. More importantly, I really value simple and solid explanations to important problems in any science.


Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Jul
6
awarded  Yearling
Jan
15
accepted Average distance between random points inside a cube
Jan
14
comment Average distance between random points inside a cube
Oh! Yeah, I think that is it. The nearest-neighbour distance. I got everything confused.
Jan
14
comment Average distance between random points inside a cube
I am still confused about where the concentration of points enter. I mean, if $n$ is large, than the average distance between them should be smaller, but I don't see how that enters the calculation. Anyway, thank you for the help.
Jan
14
asked Average distance between random points inside a cube
Nov
29
comment Solving for the trace of a matrix
This is incredible. Thank you so very very much.
Nov
29
accepted Solving for the trace of a matrix
Nov
27
comment Solving for the trace of a matrix
I have come across that manipulation but, unfortunately, it does not remove $\Theta$ so it doesn't really work much. But, in any case, thanks for your help.
Nov
27
comment Solving for the trace of a matrix
@Berci the matrix $\Theta$ is uniquely determined from the Lyapunov equation. Hence so is $F$.
Nov
27
asked Solving for the trace of a matrix
Nov
17
comment Reference suggestion: eigenvalues of tridiagonal matrices
@Elias Great. Thank you very much.
Sep
10
accepted Discrete Analogue of the Fundamental Theorem of Calculus
Sep
10
comment Discrete Analogue of the Fundamental Theorem of Calculus
Good Point. :) Once again, thank you.
Sep
10
comment Discrete Analogue of the Fundamental Theorem of Calculus
I see. But isn't this notation misleading? I mean, in continuous calculus you write $d/dx$ to specify the derivative is with respect to $x$. Wouldn't $\Delta_n$ be a more adequate notation? And is this common in difference calculus literature? Anyway, thank you very much for the answer.
Sep
10
asked Discrete Analogue of the Fundamental Theorem of Calculus
Aug
31
comment Modification of the continuous time Lyapunov Equation
The idea in your answer is probably unfeasible, since my system has $n > 200$. Could you point out a reference for this pole-place method? By the way, thanks for the support.
Aug
30
asked Modification of the continuous time Lyapunov Equation
Aug
21
comment Calculate a whitening matrix without using inverses?
Isn't computing the entire eigenvector matrix also expensive, even for a symmetric matrix? I wonder if Cholesky itself isn't faster.