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Nick Alger's user avatar
Nick Alger's user avatar
Nick Alger's user avatar
Nick Alger
  • Member for 12 years
  • Last seen this week
13 votes
Accepted

Extracting diagonal of an approximately diagonal matrix when we don't know its entries

12 votes
Accepted

Linear programming with matrix constraints

12 votes
Accepted

Solving linear system of the form $ABx=b$

10 votes
Accepted

Fast vector - "diagonal" matrix multiplication

9 votes

Applying matrix square root inverse in matrix-free regime

9 votes

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

8 votes
Accepted

Does a symmetric positive definite matrix also have $\mathbf{A} = \mathbf{L}^T\mathbf{L}$ (where $\mathbf{L}$ is a lower triangular matrix)?

8 votes

Why are systems with clustered eigenvalues easy to solve?

7 votes

Reference request: Rigorous analysis of algorithms for PDE and ODE

6 votes
Accepted

diagonalization of matrix - omitting small matrix elements

6 votes

Efficiently computing the product of a multi-dimensional matrix (or tensor) and vectors

6 votes
Accepted

treating "almost linear" nonlinear least-squares problems

6 votes
Accepted

Computing square root of diag(u)-uu'?

5 votes
Accepted

Lagrange multipliers space is too rich in a mathematical view

5 votes
Accepted

What would be a good approach to solving this large data non-linear least squares optimisation

5 votes
Accepted

Why are convex problems easy to optimize?

5 votes
Accepted

Calculating the log-determinant of a large sparse matrix

4 votes

Why is SQP better than Augmented Lagrangian for nonlinear programming?

4 votes
Accepted

Is the marching triangles algorithm guaranteed to terminate?

3 votes

Efficient interpolation method for unstructured grids?

3 votes

Optimization of known function with respect to two unknown function arguments

3 votes
Accepted

numerically stable routines to compute $M = B A^{-1} B$

2 votes

Derivative of the inverse of the Right Cauchy-Green Deformation Tensor wrt itself

2 votes
Accepted

Are there mesh generation methods that allow ugly elements?

2 votes

Inaccurate Derivatives from Adjoint method for ODE-constrained problem

2 votes

What are the names of the variables in the linear system $Ax=b$

2 votes

Fast iterative approximate order-oblivious Orthogonalization algorithm?

2 votes

Prescribe solution of a PDE at specific points

2 votes

Understanding the conditions for which ADMM can be applied

2 votes
Accepted

Python environments for AMG and Gauss Seidel as solvers instead of preconditioners