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For questions on quadratic programming, methods to solve them and related solvers. Use this tag along with (optimization).

4
votes
1answer
How to solve the following minimax problem quickly? The variables are all continuous. $$\max_{x_{1}, x_{4}, x_{5}} \min_{x_2,x_3} \vec{c}^{\intercal} \vec{x}$$ subject to the following constraints: $$ …
asked Aug 21 '21 by Qurious Cube
3
votes
1answer
Ising Model In an Ising model, the Hamiltonian of one configuration of spins $\vec{s}$ is: $$ H(\vec{s}, \mathcal{J}, \mathcal{h}) = \sum_{i} h_{i} s_{i} + \sum_{i \ne j}J_{ij} s_{i}s_{j} $$ where eac …
asked Jul 24 '21 by Qurious Cube
3
votes
According to the equality constraint (the equal to 4 one), at least two of the $x_{?}$ are 1. Therefore, the slack for the 1st constraint is at most 3. According to the equality constraint, the worst …
answered Jun 20 '21 by Qurious Cube
8
votes
2answers
Inverse Ising Problem The inverse ising problem means fitting the coupling $J_{ij}$ and field $h_{i}$ parameters given a sample of configurations of spins. Each spin $s_{i}$ is either +1 or -1. The Ha …
asked Jul 24 '21 by Qurious Cube