Questions tagged [matlab]
For questions about solving Operations Research problems using Matlab programming language.
19
questions
0
votes
1answer
62 views
lsqcurvefit error in simulation of demands in MATLAB
I want to simulate the demand of a factory. This is not a real problem, the demand follows this relation $D= AB^2C^3$ where $A$, $B$ and $C$ have normal distributions: $$A\sim N(10,2.5),\quad B\sim(6,...
6
votes
1answer
232 views
What underlies intlinprog in MATLAB?
When a paper says they used the intlinprog in MATLAB to solve an integer program, what system actually does the solving? I have seen documentation about Gurobi and MATLAB: does Gurobi always provide ...
1
vote
0answers
29 views
Create randomly an undirected connected graph using Matlab [closed]
I want to create randomly an undirected connected graph $G=(V,E)$ with $n$ nodes and $m$ edges using Matlab. How can I do this?
3
votes
1answer
113 views
Following code doesn't work in matlab with CVX
Given the following problem \begin{align}\min&\quad x_1+2x_2+3x_3+4x_4+\sum_{i=1}^4x_i\ln(x_i)\\\text{s.t.}&\quad e^\top x=1\\&\quad x\geq0\end{align}
I was asked to solved the dual ...
0
votes
1answer
52 views
How to convert an element of a variable to a convex constraint using binary variables?
I defined a complex variable in cvx, but I want to restrict the first element of the variable to be larger than the max of the variable, but it doesn't work. Someone told me to transform it using a ...
2
votes
0answers
124 views
Reading MPS file for linear programming and reconstructing the Optimization model
Are you aware of any tutorial that can help me learn on how to reconstruct the objective function and constraints from a MPS file once it's loaded in MATLAB. I can load the mps file given to me and ...
4
votes
1answer
434 views
MILP Minimum set Vertex cover coding by Python or MATLAB?
As a following up for my question for modeling a simple moded of the minimum set vertex cover problem, which is shown next. I would like to have your help in modeling this problem using Python or ...
3
votes
1answer
271 views
Why is the Lagrange Multiplier not equal the Shadow Price (Excel solver, Matlab linprog, Gurobi)?
I have a LP with equality and inequality constraints.
When solving the LP with the excel-solver (GRG Nonlinear) the sensitivity report returns the lagrange multiplier for all constraints.
When solving ...
-2
votes
1answer
186 views
Optimized Production Planning & Scheduling
I want to create an optimized schedule and production to meet demand of four different buyers. I am starting with Pulp but not able to account for continuous production variable and discrete dispatch ...
4
votes
3answers
1k views
Branch and bound algorithm programming code
I want to solve an integer programming problem using the branch and bound method, but I'm having trouble finding the programming code. From what I saw, almost all algorithms use it for traveling ...
30
votes
11answers
12k views
MATLAB vs. Python in industry
I am a beginning PhD student in math, and I would like to focus on optimization. I am learning programming for the first time, and I have written out some rudimentary optimization algorithms in both ...
1
vote
1answer
161 views
How do I solve this Optimization problem?
Optimization of a simple expansion problem
minimise:
$$
\sum_{t=1}^{5}\left[\sum_{i=1}^{2}x_{i,t}CC_i\left(\frac{1+EIC}{1+r}\right)^t+UE_t*C_{UE}\right]
$$
subject to:
$$
0 \leq x_{i,t} \leq 5 \\
...
4
votes
0answers
138 views
Does anyone have the criss cross algorithm programming code to solve linear programming problems?
I have a project that requires programming code for the simplex algorithm and criss-cross algorithm. The purpose of this project is to compare the two methods. I've tried to find it, but the ...
3
votes
1answer
483 views
Linear programming sensitivity analysis using Matlab
I have a linear program in the MPS file format listing all the rows, columns, right-hand sides, etc. I can read that in Matlab and solve it using linprog. However, it seems there is no easy way to do ...
6
votes
1answer
110 views
MPS file generation
I have a code in MATLAB which uses YALMIP to structure my optimization model and solve it via a solver. I would like to obtain a .mps file out of my model, apparently, YALMIP does not produce this if ...
9
votes
2answers
172 views
When should I use a solver for IP and MIP and can I just use a library from Python, R, Matlab, etc...?
Are there any rules of thumb for figuring out when you need to use a solver like Gurobi or CPLEX, and when you can just solve you problems directly with a Python, R, or Matlab package?
Is it just a ...
9
votes
3answers
2k views
Matlab fmincon for a problem with many nonlinear constraints
Using Matlab to solve a problem which has linear objective function and many nonlinear constraints, I am trying to generate the inequality nonlinear constraints by a function and pass it to fmincon ...
9
votes
1answer
414 views
Advantages of IBM CPLEX Studio over CPLEX in MATLAB?
This question comes from the perspective of an MSc student new to both OR and programming OR problems in a MIP framework. My research has led me down this path of needing to program an optimization ...
14
votes
2answers
186 views
Solver rounding precision vs programming language rounding precision
Often times I have this issue. For example, I need to have a non-negative coefficient, say $c_0$, in my optimization problem (otherwise the problem is not convex). Moreover, to obtain this $c_0$ I ...