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Computational Science : Recent Questions and Answers (Page 24)

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

Implicit methods for variable coefficients based on equations of state

For example I have an equation that goes something like $partial_t rho = -nablacdot (rho u) + nabla cdot(D(rho, T) nabla rho) + rho_s$ ($rho, rho_s,...

Asked on 04/12/2021

1 answer

Compute point-spread-function between original and blurred image

Take an image $f$ with some characters on it (below, hjFu3).Let's apply a filter $h$ on it to obtain a second image $g$ where the text...

Asked on 04/12/2021

2 answer

Generating structured paraboloid using gmsh

I am trying to get the structured mesh as shown in the figure. I have used the transfinite surface and curve to achieve the same. Though I get the structured...

Asked on 04/09/2021 by jomegaA

1 answer

Why is Time evolving block decimation so efficient?

I have a short question about Time evolving block decimation (TEBD). During a lecture I was told that this method is very efficient in evolving 1D quantum...

Asked on 04/09/2021

1 answer

How can I change th code to implement the Fourier series as defined?

I want to compute the Fourier series expansion of the function $$f:[-1,1] to mathbb{R}$$with $$f(x) = begin{cases} -x & x <...

Asked on 04/09/2021

0 answer

Problem of half-planes intersection

Consider the half-planes ${x leqslant 2}$ and ${x+y leqslant 3}$. These two half-planes are coded with the R package 'rcdd' as follows:library(rcdd)A <- rbind( c(1,...

Asked on 04/06/2021 by Stéphane Laurent

2 answer

Good method for correlated samples and estimating autocorrelation times

I'm working on a Monte Carlo project similar to the Ising model. I've found many examples on which I've based my code. From some papers I read...

Asked on 04/04/2021 by Daniel Sela

1 answer

Coding up Newton's method for a mapping from R^2 to R -- the Jacobian wouldn't be invertible

I'm trying to code up in Matlab a multivariable Newton's method, for a mapping from R^2 to R, but the Jacobian would be a 2x1 matrix, not square, so it...

Asked on 04/03/2021 by user37077

1 answer

How to make a directed graph symmetric?

Say I have a directed graph given as an adjacency matrix $A$ in CSR format represented by the arrays ia (row indexes) and ja (column indexes)....

Asked on 04/02/2021 by IPribec

0 answer

Writing a programming code directly from the mathematical formula?

For using any programming language, a mathematical formula should be written in the corresponding code. I wonder if there is any service (for any programming language, Matlab, Mathematica, Python, etc)...

Asked on 04/01/2021 by user25735

2 answer

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