Wolfgang Bangerth's user avatar
Wolfgang Bangerth's user avatar
Wolfgang Bangerth's user avatar
Wolfgang Bangerth
  • Member for 10 years, 9 months
  • Last seen this week
58 votes
Accepted

Is it a good idea to use vector<vector<double>> to form a matrix class for high performance scientific computing code?

32 votes
Accepted

Why would you need frameworks like MPI when you can multi-task using threads?

27 votes
Accepted

How do compression algorithms compress data so fast?

25 votes
Accepted

Why is the time dimension special?

23 votes

Meaning of "-0.0" in Python?

23 votes

C++ vs Fortran for HPC

20 votes
Accepted

Why isn't my Matrix-Vector Multiplication Scaling?

20 votes
Accepted

uniform vs. non-uniform grid

20 votes
Accepted

Pressure as a Lagrange Multiplier

19 votes

Recommendations for a usable, fast C++ matrix library?

19 votes

What features do users need from an MPI C++ interface?

18 votes
Accepted

Mathematically, why does mass matrix / load vector lumping work?

18 votes
Accepted

Why is it difficult to numerically solve multi-electron time-dependent Schrödinger's equation

17 votes

Higher precision floating-point arithmetic in numerical PDE

17 votes
Accepted

Type of Navier-Stokes equation

16 votes

Binary vs. ASCII file size

16 votes

Why is my iterative linear solver not converging?

15 votes
Accepted

Can compressible flow solvers be used to solve incompressible flow?

15 votes
Accepted

Is the exponential function, e^x, very expensive to compute in Matlab and harmful to my computer?

15 votes

What are good ways to document scientific software?

15 votes

What guidelines should I use when searching for good preconditioning methods for a specific problem?

15 votes
Accepted

What is the best way to determine the number of non zeros in sparse matrix multiplication?

14 votes
Accepted

Understanding the Wolfe Conditions for an Inexact line search

14 votes

Is it worthwhile to write unit tests for scientific research codes?

14 votes
Accepted

To what extent is generic and meta-programming using C++ templates useful in computational science?

14 votes

How do I write dimensionally agnostic code?

14 votes
Accepted

Optimize an unknown function which can be evaluated only?

14 votes

Does Computational Science involve programming?

14 votes

20% performance penalty for a nice software design

14 votes

Fast explicit solution for $\mathbf{A}\mathbf{x} = \mathbf{b}$, $ \mathbf{b} \in \mathbf{R}^3$, low condition number

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