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Federico Poloni's user avatar
Federico Poloni's user avatar
Federico Poloni's user avatar
Federico Poloni
  • Member for 11 years, 1 month
  • Last seen this week
32 votes

Good examples of "two is easy, three is hard" in computational sciences

32 votes
Accepted

Why do we usually not want the eigenvalues of non-symmetric matrices?

25 votes

More stable algorithm to calculate `sqrt(a^2 + b^2) - abs(a)` in MatLab

22 votes
Accepted

How to find the nearest/a near positive definite from a given matrix?

19 votes
Accepted

Why does this preconditioner effectively reduce the condition number of a random SPD matrix?

15 votes

Matrix multiplication accuracy Matlab vs Python

12 votes
Accepted

Evaluating $\log(\exp(x)+1)$ for negative $x$

12 votes

Checking singularity of a matrix

12 votes

C, Julia, Python, Maxima, Mathematica, ChatGPT and numerical errors

11 votes
Accepted

What happens when I use a conjugate gradient solver with a symmetric positive semi-definite matrix?

11 votes
Accepted

What is the state of the art algorithm for diagonalizing real symmetric matrices?

10 votes
Accepted

How does gmres method iteration behave for this non-diagonalizable matrix?

10 votes
Accepted

Accuracy loss in single-precision Euclidean norm computation

10 votes

Positive root of $x^q + bx - b$

10 votes
Accepted

Why are all eigen solvers iterative?

9 votes

Optimized Lanczos method for finding eigenvalues of $A \otimes B$

9 votes
Accepted

Poor SVD reconstruction of singular matrix

8 votes

Why the product of symmetric-sparse matrices is not symmetric, or dense

8 votes
Accepted

What is the Complexity of MATLAB operations

8 votes
Accepted

Is R or Matlab currently faster?

8 votes
Accepted

How to compute all the eigenvalues of a large sparse matrix using matlab?

8 votes
Accepted

Python: Underflow vs. exp of large negative numbers

8 votes
Accepted

Reverse-engineering a quadratic fit?

8 votes
Accepted

Computing powers of diagonal + rank-1 matrix?

8 votes
Accepted

Composite matrices in Numpy

8 votes
Accepted

Solving $AX+X^TB=C$?

8 votes

How are scientific computing workflows faring on Apple's M1 hardware

8 votes
Accepted

How to design a sin and an arcsin function such that arcsin(sin(x))=x, where x is a finite precision floating point number

8 votes

What is the best method of computing $a^{(k)}/k!$?

8 votes
Accepted

Bareiss algorithm vs. LU-decomposition

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