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Computational Science : Recent Questions and Answers (Page 21)

Find answers to your questions about Computational Science or help others by answering their Computational Science questions.

Producing Voronoi diagram in three dimensional

A Voronoi diagram is a kind of tesselation that divided the medium into polygons in 2D and polyhedrons in 3D. Although there are many algorithms to construct a Voronoi diagram,...

Asked on 05/18/2021

0 answer

Source Code for Particle Simulation, Cuda, PyCuda

I am looking for references, pointers to CUDA code that runs particle simulation in parallel, calculating particle trajectories, handling collisions, etc. I've seen some in NVidia source base, but was...

Asked on 05/17/2021

1 answer

Python routine to calculate shape resonances of H2

I am currently doing a project in which my aim is to write a program that can be used to calculate single and multi-channel shape resonances. So I'm looking at...

Asked on 05/17/2021 by Alon Shoshan

0 answer

Poisson equation, stiffness matrix positive definiteness, Dirichlet boundary conditions

I have a question regarding the positive definiteness of the stiffness matrix. Specifically, I believe that it should be positive definite only when at least one Dirichlet point is given,...

Asked on 05/16/2021

0 answer

Computationally Feasible Wavelet transform algorithms for 1-D data with many samples

I am doing multi resolution analysis on a 1-d Dataset with large amount of samples (few millions). Currently I am experimenting with pywavelets in python but it gets incredibly intensive...

Asked on 05/13/2021 by Manuel Jenkin

0 answer

Non-negative least squares with very small numbers

(I have asked this question on StackOverflow previously but it has been pointed to me that CSSE or MSE could be more appropriate) I have to solve a constrained optimization...

Asked on 05/12/2021

1 answer

How to verify solution to pre-conditioned linear systems solver?

I am solving Ax=b. A has a very large condition number (> O(10^10)) I am using the conjugate gradients method with point jacobi pre-conditioning. I obtained a solution 'x' that...

Asked on 05/12/2021

2 answer

Solving DAE with higher index

I want to solve 7 coupled differential equations in MATLAB. I used the method of lines (MOL) to convert them to a system of DAEs. I then attempted to solve...

Asked on 05/09/2021

2 answer

2 point BVP solver: how to compute errors

Background I am working with chapter 2 in LeVeque's book: https://faculty.washington.edu/rjl/fdmbook/ I have build my own solver in Python to solve the 2 point BVP:$$...

Asked on 05/08/2021 by k.dkhk

1 answer

Fortune algorithm for voronoi diagram

Although there are many algorithms to construct Voronoi diagram, some of them are faster than others. Based on my knowledge Fortune algorithm is fastest for construct Voronoi diagram either in...

Asked on 05/08/2021 by ALIN

0 answer

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