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I am struggling with this: In a render view in Paraview, is it possible to draw a square or rectangle around the region of interest and have this as a...
Asked on 02/08/2021 by stephanmg
1 answer(Crossposted on cstheory.SE) When is it easy to invert a sparse matrix? Specifically, I'm wondering about the cases in which matrix inversion has similar cost to sparse matrix multiplication,...
Asked on 02/07/2021
2 answerLet $Omegasubset mathbb{R}^{2}$ and $tau_{h} = {Omega_{k}}_{k=1}^{N}$ be a triangulation of $Omega$. The $L^2$ error for a FEM approximation $u_{h}$ is given by: $...
Asked on 02/07/2021 by tnt235711
1 answerI'm trying to verify the order of convergence for implicit Euler method to numerically solve Black-Scholes PDE. Theory says that it should be $O(Delta t + Delta S^2).$ My...
Asked on 02/06/2021 by Rhombus
1 answerI need to have a sparse matrix whose elements are not simple numbers, but objects, e.g. a couple of floating point values and a bunch of integer indices. I am...
Asked on 02/04/2021
1 answerI need transfinite mesh a small section of the bolt hole to insert a crack. However, The transfinite mesh and regular full quad mesh seem being incompatible and throwing errors....
Asked on 02/04/2021 by CrimeFighterCE
0 answerThe code below basically illustrates my problem. It is a test code for a pendulum. I solve it using a method suggested on https://stackoverflow.com/questions/12926393/using-adaptive-step-sizes-with-scipy-integrate-ode). Now I want to plot...
Asked on 02/03/2021 by Dipole
3 answerI have quite a lot of experience solving unsteady Euler equations, including multi-component ones, with in house-coded finite-difference and finite-volume methods, including MacCormack and MUSCLE schemes and WENO flux reconstruction....
Asked on 02/03/2021
2 answerIn several optimization problems, we found what we called the balanced constraint(c^T • x = z )For exp: C^T • 1 = 0 (C is a binary Matrix)Can I...
Asked on 02/01/2021 by user36820
0 answerSuppose $a_i,b_i$ are $dtimes 1$ matrices, $y_i$ is scalar, and I need to find least-squares solution $w$ of the following system of $n$ equations: ...
Asked on 01/31/2021
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