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Alan Weiss

MathWorks

Last seen: Today Active since 2011

I write documentation for MATLAB mathematical toolboxes, primarily optimization. I have also written documentation for PDE, statistics, symbolic math, and econometrics.

My pre-MathWorks job was with Bell Labs, primarily in mathematical models of data traffic, with a strong interest in parallel computation and in rare events (large deviations).

I do not provide private consulting. If you have a question, please ask on a public forum such as MATLAB Answers.

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Answered
Matlab optimprob _Problem based _how can i see the optimal parameter setting while using optimprob
You can set a plot function in the options for your solver. To see which solver is being used, call optimoptions: options = opt...

3 Tage ago | 0

Answered
How to find fixed number of variables with value 1 using Genetic Algorithm with population type Bitstring ?
If I understand you correctly (and I might not have understood), you want to impose a linear constraint on the population x sum...

3 Tage ago | 0

Answered
Find best input combinations that will maximize the output of a non-linear ODE mathematical model
Add the parameters to optimize as a vector in your ODE calculation: function rest = Scrpt1(t,X,params) x2 = X(1); x3 = X(2);...

11 Tage ago | 1

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Answered
How to use simulated annealing to optimize a simulation based, multicriteria Problem?
Your question confuses me because you talk about having a multiobjective problem but then seem to want to use simulannealbnd to ...

12 Tage ago | 0

Answered
parallel computing in Genetic algorithm
You have to be careful using parallel computing. Are you using Simuulink® for the simulation? I am not sure that it can run in p...

15 Tage ago | 0

Answered
How to find a part of function value in Genetic Algorithm after each iteration cycle
I think that you can write a Custom Output Function for Genetic Algorithm and use it to calculate what you want and store them i...

17 Tage ago | 0

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Answered
Coding a GA using constraint functions but getting array size error. - SOLVED
I think that you can investigate this problem yourself by using the debugger to set a break point at or just before line 119, an...

17 Tage ago | 0

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Answered
multi constraints fmincon optimization
I don't know which of these variables are optimization variables, meaning those that can be changed to try to optimize, and whic...

19 Tage ago | 0

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Answered
surrogateopt: get handle of optimized surrogate function
Sorry, the surrogate is not returned and is not available. We have no idea whether the surrogate is a good approximation to the ...

25 Tage ago | 0

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Answered
Intlinrprog (maximize) vs excel Solver (Maximize)
Your problem is that you set intcon = 3; This means that the only variable restricted to be an integer is x(3). Instead you sh...

25 Tage ago | 0

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Answered
Multi-objective optimization
Are you looking for the gamultiobj solver? Or are you asking something else? Alan Weiss MATLAB mathematical toolbox documentat...

26 Tage ago | 0

Answered
Find values for best and mean fitness value for each generation in Genetic Algorithm
Use a Custom Output Function for Genetic Algorithm. Model it on the gaplotbestf plot function. To see that function, edit gaplo...

26 Tage ago | 1

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Answered
Optimization of multiple input variable to a model
Usually you should use a least-squares solver for nonlinear fitting. See Nonlinear Data-Fitting and Nonlinear Least -Squares, Pr...

26 Tage ago | 0

Answered
about genetic algorithm
The topic Mixed Integer ga Optimization adderesses this kind of question. For an example that uses integer variables for non-int...

26 Tage ago | 0

Answered
Linear programming exercise help
This looks like quadratic programming, not linear programming. In any case, it looks quite straightforward to solve this kind of...

26 Tage ago | 0

Answered
Solving an optimization problem using fmincon
I think that this is a straightforward problem is you use the problem-based optimization workflow, which requires a relatively r...

26 Tage ago | 1

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Answered
Bayesian Optimization Hyperparameters .
The bayesopt function performs all Bayesian optimization. The bayesopt algorithm is described here. When finding the best parame...

29 Tage ago | 1

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Answered
How set properly a multiobjective optimization problem
I think that you need to understand that the optimization variables all need to be in one variable, typically called x. See Writ...

etwa ein Monat ago | 0

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Answered
Simulation: fminsearch in a for loop
Do you really want TolFun = 1000? Are you sure? I am not sure that I understand what you are trying to do, but maybe you have a...

etwa ein Monat ago | 0

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Answered
3 variable Linear function problem
In linprog set lb = [0 0 -Inf]; You will have to take the negative of your objective function vector in order to maximize. Al...

etwa ein Monat ago | 0

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Answered
prediction using genetic algorithm
Perhaps you are looking at fitting a parameterized model to data using the genetic algorithm. You can follow the Nonlinear Data-...

etwa ein Monat ago | 0

Answered
How do I optimise a logarithmic (log) function in Matlab?
It depends on which variables you can change in your optimization process, and whether there are any constraints such as bounds....

etwa ein Monat ago | 0

Answered
Solving a MINLP Optimization Problem
There are two MINLP solvers in Global Optimization Toolbox: ga and surrogateopt. Either should work for you. The surrogateopt so...

etwa ein Monat ago | 2

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Answered
How to optimize the variables of a regression model
I think that you need to connect your data argument to your x argument. Something like this: function f = objconstr(x,trainedMo...

etwa ein Monat ago | 1

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Answered
Bayesian Optimization Output Functions within Matlab App
I don't know what you mean "when calling a function within an app, I need to also supply the argument app." However, maybe I ca...

etwa ein Monat ago | 0

Answered
Error using MATLAB GA - [left and right sides have a different number of elements]
I do not understand this line: objFun = @(x) my_objFun(var1(j),var2(i)); Where does the variable x enter objFun? I think that ...

etwa ein Monat ago | 0

Answered
Find best input combinations that will maximize the output of a non-linear ODE mathematical model
I don't know what an SBML file is. But to optimize an ODE you can look at these examples: Fit ODE, Problem-Based Fit an Ordina...

etwa ein Monat ago | 0

Answered
Gamultiobj only finding one point on pareto front
I suggest that you find the single-objective minima as in Start from Single-Objective Solutions or Start from Single-Objective S...

etwa ein Monat ago | 0

Answered
How can i multiply each element of structured array
I'm sorry that you are having these problems, but you must realize that all of them are due to size mismatches in your structure...

etwa 2 Monate ago | 0

Answered
How can i multiply each element of structured array
You need to extract the correct elements from your structures before using them. I am not sure what you mean to have as an objec...

etwa 2 Monate ago | 0

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