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Computational Science : Recent Questions and Answers (Page 11)

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

How to optimize sampling for global sensitivity analysis

What is a good way to sample parameters for performing global sensitivity analysis? Some methods are defined using integrals, some are use Monte Carlo. How do these compare?...

Asked on 08/22/2021 by Chris Rackauckas

1 answer

Solving coupled ODEs using Runge-Kutta method

I want to solve the following sets of $n$ coupled equations. Initial values of $x_{n}(t)$ and $p_{n}(t)$ are specified. The problem is, I have an 1D lattice...

Asked on 08/22/2021

3 answer

Matlab - Fast Computation of Truncated SVD / PCA

I'm working with a Matlab codebase wherein I'm attempting to solve A*c = b by approximating the (square) matrix A with its q largest principal components (basically using the rank-q...

Asked on 08/22/2021

1 answer

$P0$ elements for $H1$

Are there $P0$ (zero degree/constant element) nonconforming methods for approximating solutions in $H1$? More specifically, I have the equation: $$u-f - TDelta u = 0$$ Which can...

Asked on 08/22/2021

2 answer

Different questions about "Inverse Physics problems"

I am in a context of forecasts in astrophysics. Don't be too rude if questions seem to you stupid or naive but rather indulgent, I am just looking for better...

Asked on 08/22/2021

2 answer

Numerical solution of high-dimensional integral involving positive-part function

Consider a potentially high-dimensional (say, $N$ up to 20) integral of the form$$int_0^infty rho_1(x_1)rho_2(x_2) cdots rho_N(x_N) bigg(x_1+x_2+cdots+x_N -Kbigg)^+ , dx_1 cdots dx_N.$$where $(z)^+...

Asked on 08/22/2021 by davidhigh

3 answer

Calculating the Strange Attractor of the Duffing Oscillator in C++

I am simultaneously trying to learn computational physics methods, chaos, and C++. I think this is the right site for the question, and I apologise if not. I started working...

Asked on 08/22/2021

1 answer

coarsening coefficient matrixes (A2h, A4h...) for geometric multigrid method in 2-D/3-D

I am learning about multigrid methods from the textbook section 6.3 Multigrid Methods, which shows a geometric multigrid algorithm for 1-D examples in detail, including how to...

Asked on 08/22/2021

1 answer

How to calculate error in successive over relaxation for PDE?

I am trying to solve the Poisson equation numerically using the FDM method in C++. But I have a little confusion with the iterative process. I understand that the number...

Asked on 08/22/2021 by Ritika Shrestha

1 answer

Calculating residue of a rational function

I have a function$$f(z) = frac{1}{(z-z_1)(z-z_2)(z-z_3)(z-z_4)}$$All of ${z_1,z_2,z_3,z_4}$ are simple poles. The residuesfor this function are given as$$text{Res}(f(z),z_i)= limlimits_{zto zi}...

Asked on 08/22/2021 by Galilean

1 answer

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