Questions on the optimization functions of Mathematica such as FindMinimum/FindMaximum, Minimize/Maximize, NMinimize/NMaximize, etc.

learn more… | top users | synonyms (4)

0
votes
2answers
41 views

Maximise a function over one parameter that is continuous, and one that is discrete

I have a function that I would like to maximise with respect to two parameters: one continuous, another which is discrete. A simple example of this might be the following: ...
1
vote
1answer
32 views

i need a swap mutation code (genetic algorithm) in Mathematica?

I'm working on GA coding to optimize the locators position in fixturing system to minimize the error in precision manufacturing.I need a code for mutation (genetic algorithm) in Mathematica. Here, I ...
0
votes
1answer
14 views

Minimizing using indices, error: Part::pkspec1: The expression cannot be used as a part specification

I want to use Minimize where the variables to minimize are indices pointing into an array. Here a MWE that hopefully shows what my problem is. ...
3
votes
0answers
49 views

How to perform Bayesian optimization with Mathematica?

Does Mathematica have any Bayesian optimization methods for learning hyper-parameters? Practical Bayesian Optimization of Machine Learning Algorithms Jasper Snoek, Hugo Larochelle and Ryan P. ...
1
vote
0answers
41 views

How can I calculate Lagrange multiplier and the critical points with Mathematica? [on hold]

I have constraints and a function I want to know the critic points but is there a way that I can compute this method so that I can see results faster
0
votes
0answers
31 views

Generating vectors with restrictions on a lattice

Suppose we are given a certain adjacency matrix that contains the information for a given lattice. I want to generate a configuration of vectors that satisfy a restriction. Specifically, if I have ...
0
votes
0answers
25 views

Constraints for LP [closed]

Im fairly new to mathematica and I'm writing a minimization problem with constraints: ...
-7
votes
0answers
53 views

I need generalized code for genetic algorithm(an optimization technique)? [closed]

I'm working on GA coding to optimize the locators position in fixturing system to minimize the error in precision manufacturing.Basically my work is the extension of article "An analytical model for ...
1
vote
3answers
91 views

Minimize method is not giving minimum. Why?

I was doing an optimization but facing a problem getting what exactly Minimize function do. I run the following code: ...
3
votes
1answer
154 views

Finding peaks of data

I want to find peaks in my data. My code in a reduced form so far: ...
0
votes
0answers
50 views

Which method to use for finding maximum without actually computing optimization function explicitly?

I am new to Mathematica and I am currently working on an optimization problem. The optimization function that I have easy to calculate for some assignment of variable but it is very difficult to ...
3
votes
3answers
71 views

Minimizing Multiple Functions

I'm trying to write a script that will minimize a given set of functions. The homework problem I've been given lists a set of dietary information, and I'm supposed to build the optimal salad based on ...
1
vote
1answer
106 views

Equation solution using minimization

I have an equation F[x,y]=0. I need to plot y as a function of x. Due to the properties of ...
2
votes
1answer
70 views

Reordering numerically calculated eigenvalues assuming smooth dependence on a parameter

As was discussed in a different question here on SE (link) if you compute eigenvalues numerically of a matrix which depends on a parameter y, the resulting plot of ...
1
vote
0answers
57 views

Optimizing orthogonal nonlinear regression code

I'm doing a simulation problem on the Langmuir adsorption model, where I need to obtain the model parameters from simulated data using the orthogonal nonlinear least-squares regression method. Here is ...
4
votes
1answer
70 views

What is the status of the FindMinimum method “QuadraticProgramming”?

As a method option to FindMinimum "QuadraticProgramming" is still a valid option. It has the advantage of being significantly ...
0
votes
0answers
43 views

Constrained optimization and problem with complex numbers

I am trying to solve a constrained optimization problem with an implicitly defined function $\pi$. The problem is non linear and of high order, so I use numerical methods instead. The code I use is: ...
1
vote
0answers
26 views

Using ForAll in Maximize to define a bunch of conditions

I'm trying to do something very straight forward. The following maximization works: ...
1
vote
1answer
47 views

NMinimize error: Nearest::neard:

I have this function GuessError, here's a plot assuming a single variable x, Plot[GuessError[10^x, etc..], {x, 8, 12}] , being etc some more variables which are ...
-2
votes
1answer
69 views
2
votes
1answer
68 views

NMinimize works only if expression is pasted directly

Niminize works fine if I copy the minimized function directly by hands, but doesn't work if I try to do something like this: ...
2
votes
1answer
100 views

How can I change a lot of parameters to Real? [closed]

Because of some formulas with Conjugate in a notebook, I have to tell mathematica to change a lot of parameters to Real! I know that I can use Refine with Element or Assumptions: ...
2
votes
1answer
44 views

Application of Maximize: The cuboid constrained to the ellipsoid in $\mathbb{R}^3$

Since I am a student of Mathematics I enjoy to apply MMA to problems that I have a solid understanding in. The following would be such a problem: Maximize $f: \mathbb{R}^3 \to \mathbb{R}$ given by ...
1
vote
1answer
137 views

Why does it matter at what point I replace?

I need to find four orthogonal linear combinations of complicated functions, that vanish at four different points. I use (LK4 is defined below, but its shape should have nothing to do with my ...
3
votes
1answer
95 views

How to stop optimization (e.g. NMinimize) after reaching target value

Suppose we have some function f[x,y] that we want to optimize in way that we are only interested in values (x,y) that guarantee ...
0
votes
0answers
23 views

Timing of an Evaluation is not correctly displayed

From: http://reference.wolfram.com/language/howto/DisplayTheTimingOfAnEvaluationInANotebookWindow.html I ran a process that took about two minutes to finish. But the time recorded is only 0.18 ...
3
votes
0answers
63 views

Custom Methods for NMinimize/NonLinearModelFit

Is there a way to write custom methods for NonLinearModelFit or NMinimize? To give background, I currently have a batch of code that uses NonLinearModelFit with NMinimize as the method to do ...
3
votes
1answer
65 views

Why minimization does not work with symbolic array as arguments

If I try to minimize with constraints a function of several variables, with Gamma regularized function involved in the constraints it seems to works, as shown below (this is just a dummy example ...
1
vote
0answers
52 views

Maximize and NMaximize don't work for my function

I defined the following function: d1[x_] := Min[Abs[FractionalPart[x]], 1 - Abs[FractionalPart[x]]] and tried to evaluate the following function: ...
1
vote
2answers
101 views

Minimize the sum-of-squares errors for a system of ODEs

I'm trying to minimizing the sum of squared errors on a 2-equation system of ODEs and empirical data. I keep getting an error and I think the root of the problem is my invocation of ...
0
votes
1answer
30 views

Plotting Minimize output for a range of constraint values

I want to plot the minimum of a function returned by Minimize over a range of constraint values. ...
1
vote
1answer
39 views

FindMinimum function does not produce minimum from near point

Using my simple program and I would like to find such matrix elements that minimize difference of their eigenvalues. ...
4
votes
1answer
53 views

Why does EvaluationMonitor in FindMaximum only work for some regions?

This has come about after trying to understand what was going on with this question about FindMaximum and regions. My first thought in that scenario was to set-up ...
5
votes
1answer
107 views

Easy FindMaximum returns a wrong answer

FindMaximum in region is a new function in mma10,but when I tried the following example: ...
4
votes
3answers
153 views

How to fit parameters in a system of coupled differential equations

Problem description: I'm studying a chemical reaction that can be modeled by a system of coupled differential equations, and I want to use measured data to determine the parameters that appear in the ...
0
votes
1answer
92 views

Fibonacci Line Search Method

I am attempting to write a code to find to bracket the minimum of a function using the Fibonacci Line Search Method, I believe my code is well written but I am not ...
0
votes
0answers
20 views

Trouble with Minimize function

I'm trying to do my own curve fitting, by specifying a model, an error function, and minimizing it for some data. I realize I could just use FindFit, but I would like to do it this way just for fun. ...
-1
votes
1answer
104 views

Implementing the Golden Section Rule

I am attempting to write a code which brackets the minimum of a unimodal function, using the Golden Section Method Below. I am have serious issues debugging my program though, any help will be ...
0
votes
0answers
44 views
0
votes
0answers
41 views

Solving Lagrangian (4 vars to solve for)

I'm a bit new to Mathematica, but here's what I've got: ...
3
votes
1answer
192 views

How to draw a tropical surface?

By definition, a tropical surface in $\mathbb R^3$ is the set of points $(x,y,z)$ where the maximum $f=max(f_1,f_2,\dots,f_n)$ is attained at least twice, here $f_i$ stand for some linear functions of ...
1
vote
1answer
80 views

Complicated equation solving

I want to find the maximum point or optimal value $y$ of Rx1[y_, a_, b_]. ...
6
votes
2answers
68 views

Maximise output issue

When I execute the following command, I get a numerical output as follows: ...
0
votes
1answer
34 views

Minimizing a function which involves Maximize [duplicate]

I have a mathematical function: $f = \frac{c^3}{2 a (k T)^3} \sqrt{\frac{\pi u v w}{2 b}} \exp \left[ - \frac{c}{k T} \sqrt{\frac{x^2+y^2}{a}+\frac{z^2}{b}} + \frac{1}{2} \left( \frac{x^2}{u} + ...
0
votes
1answer
56 views

Minimization Nminimize nnum error

I have imported data (mat is the name, 1x100 dimensional vector)and written a likelihood function for normal distribution. ...
-1
votes
0answers
21 views

NMinimize using NIntegrate functions

I'm looking for a minimization problem. I have a numerical function which is defined through a numerical intregation, which, in turn, have two parameters. The numerical integration is a very demanding ...
1
vote
0answers
106 views

How can I speed up this NM optimization? Most delay seems to be due to long analytic expression

I am struggling with computational speed of a NelderMead optimization. Nevertheless my impression is that I lose lots of speed not only due to the NM optimization itself but rather to for instance ...
-1
votes
1answer
70 views

Looping within linear programming

I am trying to do some network programming around optimization. Here is a reduced sample: ...
0
votes
0answers
40 views

imaginary part in optimization problems

I have some trouble with an optimization problem. The constraints are always real, but in the first place there are also complex parts in the expression (which all sum up to 0). The problem now is ...
1
vote
0answers
66 views

Imposing constraints to NMinimize/NMaximize leads to wrong function values

I wrote a function that uses NMaximize to find certain parameters (using NelderMead simplex algorithm). My objective functional $J({x_i})$ is real-valued and its ...