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Top Questions

9 votes
1 answer
1k views

Why is it that SVD routines on nearly square matrices run significantly faster than if the matrix was highly non square?

5 votes
2 answers
438 views

Number of function calls and jacobian calls in scipy.root

3 votes
1 answer
175 views

Stability of Euler forward method

3 votes
1 answer
241 views

Finite difference problem

2 votes
1 answer
156 views

Solving non-linear partial differential equation numerically: $u_{xx}+u_{yy}=\mathrm{e}^{u}$

3 votes
1 answer
185 views

Solving underdetermined Lyapunov equation?

1 vote
2 answers
96 views

Implementing matrix term version of Gauss-seidel

0 votes
1 answer
74 views

Are there any established direct eigensolvers for sparse hermitian matrices?

2 votes
1 answer
143 views

Where am I making a mistake in solving the heat equation using the spectral method (Chebyshev's differentiation matrix)?

2 votes
1 answer
82 views

enough conditions to check that a matrix doesn't have Cholesky factorization while factorizing it

2 votes
1 answer
142 views

In linear programming, is there a way to constrain two variables to not have opposite sign

1 vote
1 answer
139 views

Solving PDEs using FEM using cubic Hermite polynomials

2 votes
1 answer
128 views

Large set of nonlinear equations in Sympy

0 votes
1 answer
96 views

Step size constraint in Euler backward

1 vote
1 answer
116 views

Calculating Hypergeometric1F1 for large arguments

2 votes
1 answer
113 views

How to formulate a convex expression to minimize the difference between Frobenius norm of a positive semidefinite matrix and a positive value

1 vote
1 answer
86 views

Symmetry axis boundary condition

2 votes
3 answers
202 views

Approximation of derivatives in the finite volume method

1 vote
1 answer
71 views

accuracy problem for a null space calculation on a sparse rectangular matrix

2 votes
1 answer
89 views

references for optimization in the context of parameter identification with finite elements

5 votes
0 answers
114 views

Single precision vs double precision conjugate gradients

2 votes
1 answer
82 views

Need help with the python code: Calculating Madelung constant CsCl crystal structure

2 votes
1 answer
76 views

Solving for $X$ in $\sum_{a,b} b a^T b^T X a = Y$

4 votes
0 answers
120 views

FVM for non-regular domain with triangular mesh

3 votes
0 answers
112 views

Stochastic power iteration for generalized eigenvalue problems?

1 vote
1 answer
83 views

Adding a diffusion term to the MUSCL - Kurganov and Tadmor central scheme

1 vote
1 answer
82 views

derivative matrix and the Dirac delta distribution

1 vote
1 answer
72 views

Does anyone know how to add a forcing term at the center of a cicular membrane?

0 votes
1 answer
67 views

How to plot the power spectrum

0 votes
0 answers
81 views

A confusion about the bubble function in lumped mass FEM

1 vote
1 answer
63 views

Numerically computing envelope of Gibbs oscillation

-1 votes
1 answer
38 views

Gmsh problems in Google Colab, visualize mesh

0 votes
1 answer
44 views

draw a log-log plot of MSD (mean square displacement) versus `t` of a movement of the polymer chain

3 votes
0 answers
70 views

How is the Alternating Schwarz Method used as a Preconditioner to a Krylov Method?

0 votes
1 answer
53 views

Local truncation error of given implicit 1-step scheme

3 votes
0 answers
64 views

Efficient Algorithm for LU-Factorization of Modified Matrix with Last Column Alteration If We Have Its Not-Modified LU-Factorization

0 votes
0 answers
59 views

Softening vs Smoothing Length... Is There a Difference?

1 vote
1 answer
45 views

Finding the Vector $v$ for a Given Householder Matrix Transformation of Non-Collinear Vectors $a$ and $b$

2 votes
0 answers
57 views

Numerical integration in Fourier space over 3D grid

0 votes
0 answers
55 views

How to set Neumann BC for coupled transport problem in weak form?

0 votes
0 answers
49 views

eigenvalues of inhomogeneous Helmholtz equation violate superposition using FEM

1 vote
0 answers
49 views

Overlap matrix and its inverse matrix

0 votes
0 answers
49 views

ENO-Runge-Kutta discretization

0 votes
0 answers
46 views

Is a sort of "z-drift" the result of numerical precision errors in FDM?

0 votes
0 answers
43 views

3D Quadrature schemes with points on boundary

2 votes
0 answers
42 views

How to use a preconditioner estimated from a subset of data?

1 vote
0 answers
42 views

Solution to the Liouville-Gibbs equation

0 votes
0 answers
37 views

Which numerical method can I use to solve this system of hyperbolic PDEs?


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