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4
votes
1answer
78 views
How to solve the stiff equation in this Restricted Three Body Problem numerically?
I've come across a stiff equation in solving the Circular Restricted Three Body Problem.
[An object is moving considering the effect of the gravitational forces caused by two gravitational sources ...
5
votes
1answer
55 views
Decreasing spectral radius
I have a $4\times 4$ matrix and I want to use Jacobi iteration on it. Right now the spectral radius is higher than $1$. I know that the method is guaranteed to converge if the matrix is diagonally ...
-1
votes
1answer
90 views
Flat tagging vs Hierarhical Ontologies -> what is in between? [closed]
I'm looking for different approaches about organizing information.
Could you provide reference to good overviews of approaches or do summary on your own ?
On the one hand there are flat tagging ...
5
votes
2answers
194 views
Can all eigenvalues of a Hermitian Toeplitz matrix be computed in $\tilde{O}(n)$ time?
I know there are "superfast" $O(n log^p n)$ algorithms for solving Toeplitz linear systems. Is it possible to compute all eigenvalues of such a matrix with the same complexity?
5
votes
2answers
129 views
Out-of-core matrix transpose of row compressed data
Summary: Are there good algorithms for out-of-core dense matrix transpose if each row of the matrix is separately compressed?
Details: The matrix is about 1 TB uncompressed, and is roughly but not ...
11
votes
2answers
237 views
SciComp Modeling Jobs
The meta seemed to suggest that career advice is ok . . . so here goes.
I have a couple of close friends in the ML and mathematical modeling fields just finishing PhD's, and starting out on the ...
5
votes
3answers
95 views
How can I compute the sensitivity index of an expression with a modulus operator in it?
I have a set of equations of the form:
$x_1=(ax_0+c) mod (m)$
$x_2=(ax_1+c) mod (m)$
$x_3=(ax_2+c) mod (m)$
...
$x_{n}=(ax_{n-1}+c) mod (m)$
I want to compute the sensitivity indices of each ...
6
votes
2answers
214 views
Representing charges in computer programming
I'm preparing for a thesis in computer science on calculations based on concepts from Neuroelectrodynamics.
In short this theory states, that information transfer is not done by spike time coding, ...
