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Brian Borchers's user avatar
Brian Borchers's user avatar
Brian Borchers's user avatar
Brian Borchers
  • Member for 11 years, 8 months
  • Last seen this week
68 votes
Accepted

why is A*v+B*v faster than (A+B)*v?

24 votes
Accepted

Scientific computing vs numerical analysis

23 votes
Accepted

Testing if a matrix is positive semi-definite

21 votes

Tikhonov regularization in the non-negative least square - NNLS (python:scipy)

20 votes

Rule of thumb for sparse vs dense matrix storage

19 votes
Accepted

What are the guidelines for conducting computational experiments?

19 votes
Accepted

Should I rent computing resources, or buy my own computers

19 votes

Row major versus Column major layout of matrices

17 votes

Difference between Gauss-Newton method and quasi-Newton method for optimization

17 votes

Is providing approximate gradients to a gradient based optimizer useless?

16 votes

Why does the numerical solution of an ODE move away from an unstable equilibrium?

15 votes

Time and memory required to diagonalize a 18000 by 18000 matrix using numpy in python

14 votes
Accepted

Does the matrix condition number affect accuracy of iterative linear solvers?

14 votes
Accepted

Increasing computational performance by using 16 bit numbers

14 votes
Accepted

Hardware performance, floating point functions

14 votes
Accepted

Solving linear systems by fft

14 votes

Computation Effort of Algorithms

13 votes

Confusion about compressed sensing problem

13 votes
Accepted

Solving a sparse and highly ill-conditioned system

13 votes
Accepted

Schur's Complement and Inverse of Block Matrices

13 votes

Why are higher-order Runge–Kutta methods not used more often?

13 votes
Accepted

How Jacobian matrix helps optimization faster?

13 votes
Accepted

How much more work is it to code math models in Python, compared to working with Matlab?

12 votes

Iteration counts of AMG solver changes in parallel

12 votes
Accepted

When and when not to use automatic differentiation

12 votes

What is the most efficient way to write 'for' loops in Matlab?

12 votes
Accepted

How is the SVD of a matrix computed in practice

12 votes
Accepted

Why are interior point methods difficult to warm start?

12 votes

Global maximization of expensive objective function

12 votes
Accepted

Efficient computation of the matrix square root inverse

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