1,807 reputation
1322
bio website uclue.com
location Knoxville, TN
age 61
visits member for 2 years, 9 months
seen 20 hours ago

Enjoys programming in Prolog.


Oct
4
reviewed Reviewed Sequence optimization for multithreading
Oct
4
comment Sequence optimization for multithreading
You want to maximize the minimum distance between steps that use a common object?
Sep
30
awarded  Explainer
Sep
10
comment Fastest linear solver for sparse positive semidefinite, striclty diagonally dominant matrix
I'm a bit confused by the Question statement. If a square matrix is strictly diagonally dominant, then it is nonsingular. Consequently positive semi-definite would become positive definite. Am I misunderstanding the situation?
Sep
8
reviewed Approve suggested edit on Reference for approximation errors in 2D and 3D by using FEM
Aug
24
comment Computational Science Jokes
For those so inclined, humor in Answers which doesn't take away from a substantive problem resolution should be encouraged.
Aug
21
reviewed Approve suggested edit on Time stepping in comsol multiphysics
Aug
18
answered Computational Science Jokes
Jun
24
comment Testing if a matrix is positive semi-definite
math.stackexchange.com/questions/753825/…
Jun
24
comment Testing if a matrix is positive semi-definite
The test you noticed in the library is likely based on the proposition that symmetric real matrix $A$ is positive definite if and only if each leading principle minor gives a positive determinant, something that could be checked by elimination without pivoting in exact arithmetic. The subtle difficulty of extending this to a semi-definite case has lured many authors into misstatement. I know the topic has been broached in a Math.SE Question, so I'll try to provide a link.
Apr
26
answered Optimization of prime factorization in C
Apr
24
reviewed Excellent Nodal DG method and limiters for hyperbolic conservation laws
Apr
24
reviewed Excellent Does the covariance matrix in Least Squares depend upon the input data?
Apr
24
reviewed Excellent Linear programming with matrix constraints
Apr
24
reviewed Excellent Crouzeix-Raviart Finite Element
Apr
24
reviewed Excellent Courant Friedrichs Lewy condition - how to get it?
Apr
24
reviewed Excellent last column of SPD matrix given it's spectral decomposition
Apr
24
reviewed Excellent Estimating hardware error probability
Apr
24
reviewed Excellent Convex objective function of matrix with prescribed determinant and trace
Apr
24
reviewed Excellent Least squares approximation question