Questions tagged [quadratic-programming]
Questions on quadratic programming, the optimization of a quadratic objective function subject to affine constraints.
784
questions
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Closed-form solution to linear regression under positive semi-definite constraint
Let $X,Y\in \mathbb{R}^{d\times n}$ and $W\in\mathbb{R}^{d\times d}$.
Is there a closed-form solution to the following minimization problem?
$$\min_W \|WX - Y\|_F^2, \quad W \succeq 0.$$
- 391
-3
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0
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13
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Computational Time of Interior Point Methods Per Iteration for Nonconvex QP [closed]
The title is pretty much self-explanatory. I am trying to find the computational time of interior point methods per iteration for nonconvex QP. As far as I know, it is $ \mathcal {O}(n^3)$ for a ...
1
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0
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40
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solving trace minimization problem in quadratic programming
I'd like to minimize the trace of
$P - XHP - PH^T X^T + XSX^T$
with the constraints that every entry of $X \geq 0$
here $P$ is $n$ by $n$ positive definite, $H$ is $m$ by $n$, S is $m$ by $m$ positive ...
- 179
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0
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26
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What am I missing in deriving the dual of this soft margin support vector machine?
I am trying to derive the dual form of a support vector machine from its primal form (see top of section "Kernel SVM").
While missing from the formulation linked above, I've proceeded thus ...
- 1,964
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23
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Quadratic Optimization with positivity, equality constraints - Literature Review?
I'm trying to solve a problem of the form $\min x^T Q x$ such that $Ax = b$ and $x_i \ge 0$ for all components $i$; $x, b$ are vectors; and $Q, A$ are matrices. In this case $Q$ is square and positive ...
- 1,300
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1
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34
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Orthogonal Projection onto a Polyhedron (Matrix Inequality)
How to efficiently solve:
$$\begin{align*}
\arg \min_{\boldsymbol{X}} \quad & \frac{1}{2} {\left\| \boldsymbol{x} - \boldsymbol{y} \right\|}_{2}^{2} \\
\text{subject to} \quad & \begin{aligned}...
- 9,057
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28
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Quadratic Programming and Betweenness Problem
Given Betweenness problem of $n$ variables $x_1,...,x_n$ and $m$ triplets $(x_i,x_j,x_k)$, I build a Quadratic Programming for the triplets such that for every triplet $(x_i,x_j,x_k)$ I add $(2x_j-x_i-...
user411780
2
votes
2
answers
125
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Is there a Python library that would solve a quadratic optimization problem?
I am trying to optimize a quadratic formula, where I have to simultaneously find a maximum wrt. $x$ and a minimum wrt. $y$.
More precisely, let
$F(x, y) = x M y + x 1^n$, where:
$x$ - is an n-...
- 410
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0
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39
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Converting a Quartic Term into Quadratic Form in QUBO for Prime Factorization
I'm trying to embed the prime factorization problem into the form of a QUBO. To do so, let $p$ and $q$ be two real positive numbers. We can represent these two numbers as binary numbers, which itself ...
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1
answer
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How to make this conversion from a binary integer linear program to a quadratic program?
I saw a conversion from a binary integer linear program (BLP) to a quadratic program (QP) in this link https://qr.ae/psu9Wr. I will repeat the problem below. The original problem is
\begin{align}
\...
- 11
1
vote
1
answer
44
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Solve the Soft SVM Dual Problem with L1 Regularization
I'm considering a support vector regression model with a prediction
$$ \hat{y}(\mathbf{x}_\star)=\boldsymbol{\theta}^{\top} \boldsymbol{\phi}(\mathbf{x}_\star)$$
where $\boldsymbol{\theta}$ are the ...
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0
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1
answer
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Convert 0-1 integer linear program to quadratic form.
I am searching for a general conversion from 0-1 integer linear programs to (integer) quadratic programs. And I see this answer using a general example. https://qr.ae/psu9Wr. I checked the optimality ...
- 11
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0
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21
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Minimising quadratic function subject to linear equality constraints.
The Problem
At a higher level, I am trying to minimise a function that looks a bit like this
\begin{equation}
(x_2-x_1+c_1)^2 + (x_3-x_2+c_2)^2 + ...
\end{equation}
Subject to the constraint that $x_1+...
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1
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0
answers
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Can this difference of covariance optimization be represented as convex optimization?
I have 2 estimates of covariance: $\Omega_a$ and $\Omega_b$.
I want to find the vector $x$ that minimizes the following
$x'\Omega_ax - x'\Omega_bx$
subject to
$x>0$ (each element is positive)
$1'x=...
- 385
1
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0
answers
26
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Finding the largest volume ellipsoidal hole within a set of points [duplicate]
Suppose we have a set of points $x_1, \ldots, x_N$ in $R^d$ which we call the "bad set." Now we want an ellipse in $R^d$ of maximal volume, centered at point $c$, which does not contain any ...
- 5,878
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Dual of Quadratic Programming with inequality constraints
I am new to duality concepts and I was reading a document that dualizes the following problem:
\begin{equation}
\min_{x,y} \ ||x-y||^2
\\s.t. \ A_x x \leq b_x, \ A_y y \leq b_y
\end{equation}
into:
\...
- 31
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0
answers
35
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Minimize a quadratic form constrained to the vector being non-negative and sum up to one
I want to solve the following optimization problem with respect to $\mathsf{x} = (x_1, \ldots, x_n)^\top$
$$
\min_{\mathbf{x}} \,\, \mathbf{x}^\top A \mathbf{x} \qquad\qquad\text{such that }\,\, x_i \...
- 5,267
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0
answers
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Book/Notes Recommendation for Quadratic Optimization
While self-studying and planning on doing some small-time research/fun based on Philip Wolf's "The Simplex Method for Quadratic Programming", I got interested in the notion of quadratic ...
- 2,011
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Feasible set formed by exclusion of two convex sets
I'm working on an optimal control problem which is almost entirely composed by elements of a quadratic programming problem. The decision variable is $u \in \mathbb{U} \subseteq \mathbb{R}^2$, where $\...
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1
answer
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Does a convex quadratic program have a unique dual solution?
As shown in Does a convex quadratic program have a unique solution?, a convex quadratic program has a unique primal solution $x$ if $Q$ is PD.
$$\min \; x^T Q x \\ s.t. \ Ax= b : \lambda \\ \ \ \ \ \ \...
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votes
1
answer
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Efficiency of constrained LQR formulation in CVXPY via batch-approach
I am interested in formulating a discrete finite time constrained LQR in CVXPY.
\begin{align}
\text{minimize } J = & \sum_{k=0}^N x'(k)Qx(k) + u'(k)Ru(k) \\\\
\text{subject to } & x(k+1) = Ax(...
- 103
0
votes
1
answer
64
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Symmetric linear least-squares solution with known diagonal elements
Given matrices $\pmb{A}\in\mathbb{R}^{p\times n}$ and $\pmb{B}\in\mathbb{R}^{p\times n}$ with $p>n$, I need to solve the following linear system in symmetric matrix $\pmb{X}\in\mathbb{R}^{p\times p}...
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0
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0
answers
28
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SQP and first order Taylor approximation
I am trying to use the SQP solver with a nonlinear constraint. The solver requires a linear constraint so I am trying to approximate the constraint with the first-order Taylor approximation. Is this ...
- 1
1
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1
answer
25
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Reference Request: Quadratic Optimization with affine constraints
I was wondering what is a standard textbook/source that I can reference this fact:
$\min_y \frac{1}{2} y^T C^{-1} y - b^T y$
such that $A^T y = f,$
where $C^{-1}$ is am $m \times m$ symmetric ...
- 820
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Non-negative QP
I have a rather peculiar contrained quadratic programming problem where I try to fit a left-stochastic matrix and I am not sure how to properly solve it. Consider matrices $S\in\mathbb R^{D\times N}$, ...
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0
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36
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Minimax theorem for convex quadratic programming
I have a simple and stupid question if I have a convex quadratic optimization problem with polyhedral constraints as follows:
$$
\begin{aligned}
\inf_{x \in \mathbb{R}^{n}} & x^{\top} Ax + b^{\top}...
- 139
3
votes
1
answer
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reduction from QCQP to SOCP
Suppose a QCQP problem :
$$ \min_{x\in\mathbb{R}^{n}}f\left(x\right)=\frac{1}{2}x^{T}P_{0}x+q_{0}^{T}x$$
$$ s.t:\begin{cases}
\frac{1}{2}x^{T}P_{i}x+q_{i}^{T}x+r_{i}\le0 & i=1,2\dots,m:m\le n
\...
- 892
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0
answers
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LCP of KKT from a QP without non-negativity constraint and semidefinite Q matrix
Most formulations of the LCP derived from the KKT conditions of a QP tackle problems with non-negativity constraints $x\ge 0$. Wikipedia presents an alternative without the non-negative constraints ...
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Graphing machine for a quadratic equation representing braking speed of a vehicle over time
I am solving for a particular situation. A two vehicles approach an intersection and are on a collision course. To avoid the collision, one vehicle needs to apply the brakes such that it slows to ...
0
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0
answers
54
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Quadratic programming optimization with rank 1 matrix
Let $a,b\neq \vec{0}$ be vectors in $\mathbb{R}^d$. Let $A=aa^T$ be the matrix formed by the outer product of $a$ with itself. Suppose $b\notin C(A)$, the column space of $A$. Consider maximizing the ...
- 1,161
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0
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Rearranging a Lie algebra adjoint action
I've been stuck on this problem for quite a while, and I can't seem to find any similar questions, though if my terminology is wrong and that's why I failed to find one then my apologies.
Let $A, B \...
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0
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Orthogonal projection on a lower triangular non square block matrix $A \in \mathbb R^{m=4k,n=7k}$ such that $A_{i,j}\in \{0,1\}$
If i have a very large matrix matrix $$A \in \mathbb R^{m=4k,n=7k}$$ such that $$A_{i,j}\in \{0,1\}$$ and $A$ is a lower block matrix with diagonal block $$B_t\in \mathbb R^{4,7}$$ and block left of ...
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0
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Analysis of a parametric quadratic game
I am solving a game theory problem for N players. At each step, each player solves a projection-based gradient descent $\operatorname{proj}_{X}\left(x_i^{(k)}-\eta F\left(x_{i}^{(k)}\right)\right)$ ...
- 139
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votes
0
answers
82
views
How to solve this convex QP?
Given a symmetric positive semidefinite matrix $\bf \Sigma$ and a real-valued vector $\bf r$,
$$ \begin{array}{ll} \underset {{\bf w}} {\text{minimize}} & {\bf w}^\top {\bf \Sigma} \, {\bf w} \\ \...
- 101
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votes
1
answer
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Minimizing $x^T A x$ subject to $B x \leq b$
Given $$ A = \begin{bmatrix} 4 & 0 & 1 \\ 0 & 2 & 0 \\ 1 & 0 & 1 \end{bmatrix}, \qquad B = \begin{bmatrix} 1 & 2 & -3 \\ 5 & 2 & 1 \end{bmatrix}, \qquad b = \...
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Unclear points in derivation of Lagrange duality for a quadratic optimization problem
Problem0:
$\displaystyle \min_{\mathbf{u} \in \mathbf{R}^L}\frac{1}{2}\mathbf{u}^TQ\mathbf{u}+\mathbf{p}^T\mathbf{u}$
$\,$ subject to $\,$ $\mathbf{a}^T\mathbf{u} \ge c$
Problem1:
$\displaystyle \...
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1
answer
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Seeking Clarification on Obtaining Explicit Solution for Quadratic Programming Equation
I recently encountered a quadratic programming equation and would appreciate assistance in understanding and obtaining the explicit solution. The equation is given by:
$$ u^* = \text{argmin}_{u \in \...
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votes
1
answer
103
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A theorem due to Schoenberg
I am reading the book "Additional Exercises for Convex Optimization" [ Stephen Boyd & Lieven Vandenberghe 2016 ] where I have difficulties in understanding the content of an exercise.
...
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Optimization Problem - Similar to Quadratic
I’m quite new to the forum and to optimisation, so my apologies if the question is trivial or in the wrong section. I've rewittren the question to clarify my doubt (I was previously writing from an ...
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1
answer
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When does a quadratic inequality have a solution? [closed]
Consider the following quadratic inequality:
$$x^T Q x + c^T x \leq b$$
for $x\in \Re^{d}$. When does this system have a solution?
Without loss of generality assume that $Q$ is symmetric.
Looking for ...
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0
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Is there a closed form to this quadratic program?
Problem :
I am currently trying to solve some optimization problem to get some information about a matrix. In the following, when we have a matrix $A\in\mathbb R^{m\times n}$, $0\leq A$ means that $0\...
- 5,967
2
votes
2
answers
82
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Find the max and min of $(a \mathbf{x} + c)(b \mathbf{x} + d)$, where $\mathbf{x}$ is a vector with linear constraints.
Suppose there is a $n$-dimensional column vector $\mathbf{x}$, and an objective function $f(\mathbf{x}) = (a \mathbf{x} + c)(b \mathbf{x} + d)$, where $a$ and $b$ are $n$-dimensional row vector; $c$ ...
- 45
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votes
1
answer
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Proving that a set of quadratic constraints have no solution
I want to prove that a given set of quadratic and linear inequalities has no solution. The set size is of 13 equations, or, including the positiveness constrain, 21 equations.
I already used a python ...
- 23
0
votes
1
answer
39
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How to handle the equality constraint that cannot be satisfied?
Given an optimization problem
$$
\text{min} \space x^T M x \\
\text{s.t.} \space Ax = b
$$
where an analytical solution called weighted general inverse exists.
However, we now know that Ax = b some ...
0
votes
0
answers
56
views
Quadratic programming with the non-negativity constraint
Let us assume that $B$ is a symmetric positive semi-definite matrix in $\mathbb{R}^{m\times m}$. What is the optimum solution for the following constrained quadratic programming problem:
$$min_{X>=...
- 662
1
vote
1
answer
113
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Quadratic programming: maximizing the euclidean norm
The setting is the following, I have a full-dimensional polytope $\mathcal{F}: A \cdot x \leq \vec{b}$ that has been transformed such that it contains the origin: $\vec{0} \in \mathcal{F}$. I need to ...
- 133
1
vote
0
answers
210
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Proof for the equivalence of the convex optimization problem in Kernel Fisher LDA paper.
All, I am trying to understand the convex optimization move made from eqns. 3 -> eqns. 4 in the Kernel Fisher LDA paper. The authors mention that the proof of equivalence is straightforward, and ...
- 61
0
votes
0
answers
35
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Linear vs Quadratic integer programming on the example spread vs variance
I consider the following two instances of the same problem, computing the spread as the difference of the highest and lowest occurrence of something in a set. Further, I compute the variance of the ...
- 255
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0
answers
118
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Dual of Dual problem of a simple convex Quadratic problem
I am trying to verify the
the dual of the dual is the primal? using a simple convex QP:
\begin{align}
\min_x& \frac{1}{2} x^\top H x + h^\top x\\
\text{s.t.} &~Ax\leq b \\
&~ A_e x = b_e
\...
- 157
1
vote
1
answer
135
views
KKT Conditions for SVM Problem
I am reading about SVMs and want to confirm that I understand the optimality conditions. Details below:
Consider the $n$ points $x_1, x_2, \dots, x_n$, each with $ d$ dimensions, and consider $ n$ ...
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