Questions tagged [mathematical-optimization]
Questions on the optimization functions of Mathematica such as FindMinimum/FindMaximum, Minimize/Maximize, NMinimize/NMaximize, etc.
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Optimization in Mathematica
I'm trying to solve the optimization problem below, but it seems like I don't get something about how the function works. Anyone see what is wrong?
Would be happy to exchange for the newer ...
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67 views
Efficient Mathematica Code for List Problem
Say we are given $f(m,n)=m \pm 2n + (-1)^n$ where $m>0, n>0$, $m$ as well as $n$ are integers. The problem is to generate a list of all the integers that will not be found in the list of values ...
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26 views
Minimization in a fitting [closed]
I have minimized a function and got the best fit value of two unknown parameters. I want to show these minimized value graphically. In documentation of mathematica this type of graph is found only in ...
2
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1answer
101 views
Findminimum of Integral
I am trying to find the value of $u$ that minimizes the following expression:
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1answer
57 views
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1answer
62 views
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Is it possible to create procedural lossless data compression? [closed]
Is it mathematically feasible to work on a recursive algorithm that, given a formulae, entry values, and number of rounds, could generate the very binary representation of a given file?
So instead of ...
2
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1answer
42 views
PeakDetect Function Behavior and Parameters
I am currently using PeakDetect for a project, but I'm not sure how the sharpness parameter works. I can qualitatively tell what it's doing, but is there a more analytical/mathematical way to define ...
10
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4answers
313 views
Optimization of function taking a permutation
I have a function $f$ which takes a permutation $P$ of the integers 1-100 in order to give a numerical value $f(x)$. The function is given by a black box, but is relatively "smooth", so should be ...
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0answers
55 views
How do I find the function that is perfectly between y = x^2 and y = x? [migrated]
At first, I thought it was as simple as taking both functions adding them together then dividing by two, but this is not the case for what I am looking for.
Here is a plot of the following:
...
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60 views
How would you write this set of linear programming problems as latex?
I am not able to make self understood over at Mathematics Stackexchange in this question.
Therefore I ask here the Mathematica experts how to write these linear programming problems as latex, the ...
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1answer
33 views
Modifying/optimizing a double sum with an If condition
I would like to better understand double summations where one of the sums depends on the upper limit of the previous sum. This appears frequently in representation theory (to the extent of my ...
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1answer
48 views
Calculating the distance between two points and get direction [closed]
I am programming a molecular dynamics program with periodic boundary conditions. Here, I have a problem:
I have a list of coordinates like
...
1
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1answer
68 views
Problem with minimization of $x^z$
I have plugged in the following problem
Minimize[{x^z, z >= 1, z <= 10, x >= 1}, {x, z}]
Can anyone explain please why the software does not provide the analytical solution? Clearly NMinimize is ...
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1answer
30 views
Linear Programming using Maximize
I am trying to solve a more complicated version of the following LP problem:
I have some constraint amounts a,b,c and two variables made of those amounts.
I would like to find the best way to ...
2
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2answers
37 views
Piecewise function and deriving - solving
I'm working in a (Economics) problem where I want to add two concave (profit) functions in order to maximize them together through one variable (quantity). My problem is that one of the two functions ...
0
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1answer
37 views
ListPlot3D for optimization with varying parameter values
This is a followup question from Alex Trounev's answer to my question in the following post:
3D-Plot optimization results for varying parameter values
Consider my objective function, objF:
...
1
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1answer
56 views
`Minimize` runs forever
I'm trying to minimize my object function,
(1/(2 (-1 + r)) (d^2 + 2 d k (-1 + r) - 2 d s + k (k + k (-3 + r) r + 2 r s)))/s^2
with respect to $r$ and $k$ under ...
2
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0answers
53 views
Mathematica implementations of classical genetic algorithm optimization
Are there any Mathematica implementations of genetic algorithm optimization routines, including third-party and commercial? (DifferentialEvolution isn't quite what ...
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0answers
26 views
Can one force NMaximize to continue for a specified time?
So that it is not allowed to quit (for any optimization Method) before this time has elapsed.
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1answer
27 views
Cloud deployed NArgMin does not obey constraints (but local evaluation does)
[Edited 20:02 for concision]
Problem statement: NArgMin correctly obeys constraints when evaluating locally (on $Version = "11.3.0 for Mac OS X x86 (64-bit) (March ...
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1answer
89 views
Given a function $f(t,s)$, compute $\max_{t_2\in [0,1]}\min_{t_1\in [0,1]} |f(t_1,s_1)-f(t_2,s_2)|$
Given a continuous and bounded function $f(t,s)$, $t,s\in[0,1]$, I would like to compute
$$\max_{t_2\in [0,1]}\min_{t_1\in [0,1]} |f(t_1,s_1)-f(t_2,s_2)|,$$
for each numeric values of $s_1$ and $s_2$....
2
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1answer
79 views
Simultaneous Equations and Optimization
I have the following simultaneous equations.
$W=G[V](s+80)+(1-G[V])114$
$V=(1-F[W])(90-s)$
where $F$ and $G$ are cumulative distribution functions of $x$ and $y$. The variables of $x$ and $y$ are ...
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2answers
57 views
NMaximize selects duplicate inputs and a problem with EvaluationMonitor
The aim of the following is to maximize 'penalty' and monitor it for convergence during the process:
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1answer
25 views
Error Training FeedForward Neural Network With Various Type of Variables
I built the following FeedForward NN
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0answers
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Non-trivial feasible solution to unbounded linear programming problem
I have a linear programming problem that I know is either unbounded or the only feasible solution is the 0 vector (depending on input). In fact, it isn't strictly a linear programming problem since I ...
2
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1answer
56 views
ArgMin and NArgMin gives different result
Im doing the same problem with ArgMin and NArgMin, however NArgMin messes up the order of the solution.
Given function:
...
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1answer
87 views
NonlinearModelFit returning imaginary numbers after fitting real data
I am getting problems when I try to use NonlinearModelFit to fit a squareroot-like function to a set of real data points.
Here is the function:
\begin{equation}
\...
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2answers
148 views
NMaximize not always returning solution
This question is related to a previous question and answer here:
NMinimize or NMaximize for a dynamic problem
but tackles a different problem.
I am trying to solve a simple linear quadratic ...
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0answers
45 views
Why are optimization variables exceeding their allowed regions?
In the optimization of a function, shown below, why are the variables xi, yi not adhering to their specified allowed regions {variable, 0, 5}?
...
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1answer
73 views
How to pass lists as arguments in NMinimize or FindMinimum?
The following code runs in Mathematica 12. But, I have two problems that I would like to solve: (1) How to pass a list as an argument to the function g in such a way that it can be used seamlessly ...
1
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1answer
77 views
An optimization problem over two variables
I have the function fun[x_,y_, t_] = Cos[x] + Exp[I y] Sin[x] Sin[t]; such that $0\le {\rm x}\le \pi$, $0\le {\rm y}\le 2\pi$, and $0\le {\rm t} \le 10$. I compute ...
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1answer
30 views
Define a function when given a graph with points (0,3),(2,5),(10,4),(6,2) [closed]
Define a function when you are given a graph with points (0,3),(2,5),(10,4),(6,2)
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31 views
RegionPlot with FindMaximum
I don't understand why each time I'm launching this computation Mathematica buggs and I get a message from Windows that the Kernel stopped working...
I'm trying to get a map of where the value of ...
2
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2answers
82 views
Finding extremes in discrete data by the fastest code
everybody! I'm new and that's my first post.
I have such a problem: need to extract from a matrix (with dimensions n x 2) such points which have second coordinate smaller than -500 or higher than 500....
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1answer
31 views
Constraints When Using NMinimize
I want to put in constraints like z.x1 >=1, z.x2 >= 1 where z, x1, x2 are vectors, but I do not want to list them out. ...
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0answers
33 views
Plotting results of NMinimize with respect to a parameter
I have some predefined function F[x], where x can be a 2D vector. I am doing the following:
...
3
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1answer
90 views
Minimum path on a rectangular prism
First of all, this is a fun question that I have seen from here. We have a rectangular prism with dimension $30\times12\times12$ cubic inches. Assume that there is an ant at the blue point 1 inch ...
0
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2answers
57 views
Parametric Find Maximum
I'd like to plot the maximum of a curve in function of a parameter. Meaning I looking for maxima that depend on a parameter.
Here is what I tried to do but FindMaximum is not parametric, so it did ...
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1answer
49 views
How to disable symbolic preprocessing in NMinimize without performance loss?
I want to find a global minimum of a function which is defined only numerically and cannot be evaluated with symbolic arguments. For example, this could be a minimum of a compiled function.
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1
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1answer
86 views
3D-Plot optimization results for varying parameter values
Before starting, FYI: This is a question related to 3D Plot the result of local Minimize with varying parameter values
Consider my objective function, $objF$:
...
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0answers
79 views
Kuhn-Tucker Conditions Take Forever
I am trying to solve a Kuhn-Tucker constrained maximization problem. The variables of interest are d1,d2,dr and i. The other symbols are parameters which I have several restrictions for. It's an ...
0
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1answer
47 views
Nminimize seems not work
I have to adjust a set of experimental data to a relatively complex nonlinear model. For this example I do a simulation of the data with a simplified function:
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0answers
24 views
`Minimize` not working for general case
I'm trying to perform a minimization for an arbitrary natural number. If I enter a specific number, Mathematica performs the correct minimization. Am I specifying k ...
0
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1answer
99 views
NMinimize or NMaximize for a dynamic problem
I am trying to solve a relatively simple quadratic discrete time dynamic problem using NMinimize. My code works for short time horizons (T<15) but for T longer, it ends up taking minutes and for T>=...
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3answers
70 views
Plot maximum value of a function of three variables
Given a function f[\[Theta]_, \[Phi]_, t_] given by
...
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0answers
50 views
What's wrong with my NMinimize code with the definite constraints?
I have a problem with my NMinimize code, the answer based on the paper is Mu1 = 8 and Mu2 = 19,34 that's the optimal Mu1 and Mu2. But my answer is Mu1 = 5,17 and Mu2 = 17,17. The paper said "adopt the ...
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0answers
39 views
Maximizing an integral/Solving the associated Euler-Lagrange equation
Case 1
I have the following integral which I need to numerically maximize. Here $v = v(u)$.
$$V = \int_{u_l}^{u_r} du\sqrt{\frac{4}{(1+uv)^2} \frac{(1-uv)^2}{(1+uv)^2}\frac{dv}{du}} $$
The ...
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2answers
34 views
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0answers
35 views
NMaximize with a variable ranging over permutations
I have an optimization problem where there are $n$ activities and
I want to find an optimal schedule of those activities.
The schedule is specified as $S=(\mathbf{t},p)$ where:
$\mathbf{t}=\left(t_{...
