Tagged Questions

2
votes
3answers
225 views

Which method to apply to this problem?

I'm a programmer and I came a across an interesting problem. I'm sure there is a mathematical method or an algorithm to solve it, but I don't know where to start with the search no …
1
vote
2answers
81 views

Are Bregman divergences quasi-convex?

Given a convex set S ⊂ ℝd and an appropriately differentiable convex function f: S → ℝ, a Bregman divergence Bf(x, y) = f (x) - f (y) -⟨x- y , ∇f (y …
1
vote
0answers
153 views

Optimization Game

I heard about a problem my friend had asked at my high school's math team, which was actually him just trying to figure out how to solve a game on his cell phone, but it is still i …
1
vote
1answer
138 views

Problem equivalent to “largest square in a cube”

The "largest square in a cube" problem, which asks for the largest square inside a cube, has a solution as can be seen on this page, which also says that the general problem in hig …
1
vote
2answers
132 views

Why is solving a MILP w/o an objective function so much faster?

When solving a MILP (mixed integer linear program) using a linear relaxation, the solver finds a feasible solution much faster if there is no objective function. The same problem w …
17
votes
2answers
716 views

Five Front Battle

Two generals are fighting a five front battle. Each general has 1 unit of army, which he divides into five separate armies that he sends to the five fronts. If one general sends mo …
2
votes
1answer
103 views

Algebraic characterization of transitive spaces of matrices

Fix an integer $d \ge 2$ and let $M_d$ be the space of real $d \times d$ matrices. Let $E$ be a vector subspace of $M_d$. We say that $E$ is transitive if $E \cdot \mathbb{R}^d_* …
3
votes
1answer
137 views

Maximizing Sparsity in l1 Minimization?

Consider the optimization problem $$\min_x ||Ax||_1 + \lambda||x-b||^2,$$ where $A \in \mathbb{R}^{n \times n}$, $x,b \in \mathbb{R}^n$ and $\lambda$ is strictly greater than 0. …
0
votes
2answers
129 views

univariate prior corresponding to weighted sum of L1 and L2 penalties?

Is there a univariate probability distribution $p_{\lambda,\alpha}(\beta)$ over the reals, parameterized by $\lambda > 0$ and $1 >= \alpha >= 0$, such that $p_{\lambda,\alpha} \pro …
4
votes
3answers
131 views

Navigation solution for frictionless vehicles.

Looked around a bit and couldn't seem to find a similar question. (either that or it was worded with vocabulary above the multivariable calculus I've taken. :)) Roughly worded: I …
0
votes
1answer
126 views

Uniformly distribute a population in a given search space

I am trying to uniformly distribute a finite number of particles into a 2D search space to get me started with an optimization problem, but I am having a hard time doing it. I am t …
1
vote
0answers
56 views

modification of singlestart in global optimization

When minimizing a nonconvex function $f : \Omega \rightarrow \mathbb{R}$ that may have multiple minima, there are some very simple strategies to improve the odds of finding the glo …
0
votes
2answers
191 views

If a quadratic form is positive definite on a convex set, is it convex on that set?

Consider a real symmetric matrix $A\in\mathbb{R}^{n \times n}$. The associated quadratic form $x^T A x$ is a convex function on all of $\mathbb{R}^n$ iff $A$ is positive semidefin …
2
votes
1answer
100 views

Switching function for Bang-Bang nagivation

I'm attempting to develop an equation to determine the "switching time" for a control system. I've managed to work out a specific solution for when starting and ending velocities …
-1
votes
0answers
215 views

Closed form solution to linear program

Is it possible to obtain a closed form solution to a convex optimization problem? Specifically, the optimization function I am looking at is to maximize x over a convex polygon in …

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