# Questions tagged [linear-programming]

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### Optimization and algorithms

I'm going over my practice midterm, and the last question has me stuck. It goes: Let $n \geq 1$ be an integer and let A be a symmetric $n \times n$ matrix (not necessary positive definite) for which ...
11 views

### How to properly formulate the objective function and constraints for an ERM linear program in R?

So I am having an issue I tried on my own but it seemed to no avail. It concerns the ERM (Empirical Risk Minimization) algorithm, used in Ban and Rudin's paper for solving a Newsvendor problem, which ...
1 vote
32 views

### What kind of optimization problem is this and what tools can be used to find a solution?

Problem description: The location of n solar panels is defined by the x,y location of the solar panels. Every solar panel must be protected by an anode. Each anode can protect up to 4 solar panels ...
1 vote
69 views

### Including intercept terms in piecewise linear programming

I am hoping to get some help in understanding whether the intercept terms are required in the objective function for piecewise linear programming (using the below code). ...
• 11
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### How do you optimize multiple objective functions simultaneously?

For example, suppose we want to maximize the 3 expressions on the right, subject to some constraints. To give some context, this is a problem about generating prototypes in unsupervised learning. In ...
69 views

### Combinations from different sets with weightings

Imagine the following scenario: I want to create 1000 unique combinations of clothing. The combinations would include the following categories: hats, shirts, shorts, socks and shoes. Each combination ...
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### Neural Nework and mathematical programming

I am solving a scheduling problem where staff members cannot have overtime. For this problem, I have an integer programming model and solve it using the CPLEX solver. A simplified version of this ...
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1 vote
22 views

### duel regression with orthogonal constraints on coefficients [closed]

I'm trying to solve a problem where I need to find two deming style regression models onto two different data sets of equal dimension who's coefficients(A,B) satisfy the following criteria with ...
• 11
982 views

### is it possible to estimate least squares model coefficients by linear programming?

I'm not a linear programming expert, I was just wondering; Can I get the same coefficients that I get in the least squares method with a linear programming model whose objective function is minimizing ...
• 173
72 views

### How can we allocate when we have 150 open slots every day (5 days a week) for those 200 arrivals every day

My question is to solve a very basic problem related to the allocation of slots. Say there are 20 teams with 10 persons in each team. I have 150 open slots every day (5 days a week) for those 20 teams ...
• 1,819
43 views

### Assigning Objects To Groups Using Variance

I have a set of 1945 objects, each with multiple attributes. They are all stored in a single data.frame named X. For this ...
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### How do get rid of (1 not defined because of singularities) in R? [duplicate]

I'm analyzing data in R, I'm trying to see how some variables affect test scores (Value) of different countries. In the data, since there is different time periods for different countries I need to ...
1 vote
79 views

### Defining LP investment model in Lindo/Solver [closed]

Models provided below. My questions are: 1. (G+I+M) after each constraint in the screenshot of the mathematical model below represents Growth, Income and Money ...
• 137
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### Subtract costs from the max profit or factor-in costs into the objective function?

I have the following model with profit being these selling prices for V and C: £3.5V + £5.2C. But there are also costs of V & C which are £1.30 and £1.70 respectively. When I run the model without ...
• 137
2k views

### Is it possible to optimize correlation coefficient under linear constraint?

I am new to optimization and recently bump into a problem where I have to optimize the correlation coefficient of a series of values with the absolute value of another vector under the linear ...
29 views

### Least squares for fitting a line with some thickness?

One can use least squares to fit a line to a set of points. However, these lines lack "thickness". (When I say "thickness", I refer to the orthogonal distance below and above the ...
37 views

### Resulting shapes when partitioning the constraint matrix $\boldsymbol{A}$ in linear programming

$$\boldsymbol{A} = \begin{bmatrix} {1}_n^\top \otimes \mathbb{I}_m \\ \mathbb{I}_n \otimes {1}_m^\top \end{bmatrix} \in \mathbb{R}^{(m+n)\times mn}$$ If the above matrix ...
• 3,957
3k views

### Can we use linear regression to define the objective function in linear programming?

This is a general question about how linear programming is used in the analytics community. Is it common, or feasible to use linear regression (or perhaps even more complex models like regression ...
• 415
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### Formulating a mixed integer programming problem with a binary maximization term

Real-world description of the problem: In the US, funding for school lunch programs is given to local school districts by the Federal government. If >=40% of students in a school or group of schools ...
33 views

### An artist published M albums. How to make a selection from the album so that all my N favorite songs are covered, while minimizing my cost?

This is a real life question.. I have a list of N favorite songs from an artist. Out of all M albums from the artist ever published,I want to buy a few albums to cover all of my N favorite songs, but ...
• 611
85 views

### how to set up an optimization problem to split a group of people into two groups, with several constraints

I am a bit stuck with this problem; I found a temporary (an perhaps suboptimal) solution using Excel, but I'd like to hear your opinion /advice, please. 9 people want to form a group and go on on a ...
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### Formulating quantile regression as Linear Programming problem?

How do I formulate quantile regression as a Linear Programming problem? When looking at the median quantile problem I know it is \begin{align} \text{minimize } & \sum_{i=1}^n |\beta_0 + X_i \...
195 views

### Assignment Problem (Linear Programming, Genetic Algorithm, etc.)

I'm looking for advice on how I should approach a specific problem. Some background first: The problem is about shipments falling into a bin. There are 19 such bins, which are further sorted into 20 ...
294 views

### Linear programming optimization [closed]

I have found through my reading that applying linear programming optimization techniques are substantially more expensive compared to mean squared error-based methods. Could someone please help in ...
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### If we "delete" the term of norm in SVR problem formulation, can it be solved with simplex method?

The problem formulation in Support Vector Regression is, What if we don't want to take the "flatness" term, i.e., $\frac 1 2 ||w||^2$ and delete it; can we find solution from simplex method for ...
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192 views

### lp_solve starting basis

I'm working with some fairly large LP problems in R and running into very slow computation times. I'm using the 'lp_solve' solver R wrapper ( through lpSolve and lpSolveAPI packages ), and found the ...
• 258
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### How to use equalities as constrains with constrOptim in R

I want to solve a matrix system which have several solutions (infinite since it is overdetermined - 6 equations with 8 unknowns). However, the way I want to do it is to a criterion for the variables, ...
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1 vote
302 views

### Converting general form to standard form in linear programming

I am new to linear programming and I am currently trying to convert a general LP problem to standard form. The general form the problem is as follows: I have the following objective function, in ...
50 views

### Is there a method to fit a bound to the plot of an linear inequality?

I have a physical dataset that is bounded by several different processes, and thus the plot takes the form of a linear inequality: I'm specifically interested in studying the upper bound. Is there a ...
1 vote
872 views

### Linear programming with variables in piecewise intervals

Problem: I am working on a linear programming problem, i.e. a linear objective function to minimize: $\mathbf{c}\cdot\mathbf{x}$, where $\mathbf{c},\mathbf{x}\in\mathbb{R}^{N}$ Subject to ...
2k views

### AIC/BIC for quantile regression

I am working on Quantile Regression (QR) and want to assess models using goodness of fit (GOF) measures. I have come across the post here, here that says, AIC/BIC can be calculated for QR model ...
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6k views

### How to solve least absolute deviation by simplex method?

Here is the least absolute deviation problem under concerned: $\underset{\textbf{w}}{\arg\min} L(w)=\sum_{i=1}^{n}|y_{i}-\textbf{w}^T\textbf{x}|$. I know it can be rearranged as LP problem in ...
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1 vote
315 views

### Why is Coordinate Descent not used to solve Least Absolute Deviation?

I have recently been looking into why Least Absolute Deviation (LAD) is not used in place of OLS for machine learning, and it appears the primary reason is due to difficulty in computing a solution ...
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380 views

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