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Jack Poulson
  • Member for 10 years, 5 months
  • Last seen more than 5 years ago
48 votes
Accepted

How do I take the FFT of unevenly spaced data?

37 votes

How much better are Fortran compilers really?

29 votes
Accepted

Is there any open-source or easy-to-access software that can simplify algebraic expressions like $x^{2}+2x+3, x=\sqrt{2}t-1$?

29 votes
Accepted

How can the gravitational n-body problem be solved in parallel?

25 votes
Accepted

When do orthogonal transformations outperform Gaussian elimination?

20 votes
Accepted

Can diagonal plus fixed symmetric linear systems be solved in quadratic time after precomputation?

19 votes
Accepted

Why would a computational scientist need to implement their own version of std::complex?

18 votes
Accepted

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

17 votes

Can the solution of a linear system of equations be approximated for only the first few variables?

16 votes
Accepted

Matrix exponential of a skew-Hermitian matrix with fortran 95 and LAPACK

15 votes
Accepted

How to add large exponential terms reliably without overflow errors?

15 votes
Accepted

Efficient tridiagonal matrix algorithm implementation

14 votes

Is there software that can autogenerate numerically-accurate floating point C routines from symbolic formulae?

13 votes

C++ vs Fortran for HPC

13 votes
Accepted

How to reorder variables to produce a banded matrix of minimum bandwidth?

12 votes

What's the most efficient way to compute the eigenvector of a dense matrix corresponding to the eigenvalue of largest magnitude?

12 votes
Accepted

Krylov Subspace Methods for Dense Systems

12 votes
Accepted

What is the overhead in sparse matrix multiplication

11 votes
Accepted

What should be the criteria for accepting/rejecting singular values?

11 votes

Estimation of condition numbers for very large matrices

11 votes
Accepted

What is a scalable preconditioner for high-frequency Helmholtz?

10 votes
Accepted

Is there a Moore's law for floating-point precision, and what would it imply?

10 votes
Accepted

How to find the interior eigenvalues by krylov subspace method?

10 votes

Calculating determinant while solving $Ax=b$ using CG

9 votes

Finding the square root of a Laplacian matrix

9 votes
Accepted

How can I seed a parallel linear congruential pseudo-random number generator for maximal period?

9 votes
Accepted

Seemingly non-unique Cholesky factor via QR rectangularisation

8 votes
Accepted

Matrix exponential of a real asymmetric matrix with Fortran 95 and LAPACK

8 votes

Understanding how Numpy does SVD

8 votes
Accepted

Nested dissection on regular grid