Alan Weiss
MathWorks
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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Awarded to Alan Weiss on 11 Jun 2021
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Content Feed
Find gradient numerically for the equation
There are tools on the File Exchange that can help you find numerical approximations to derivatives. For example, see Adaptive R...
3 jours ago | 0
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optimization problem - problem using det funciton
The main problem is that det is not a Supported Operations on Optimization Variables and Expressions. For example, x = optimvar...
3 jours ago | 1
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How to optimize nonlinear multiple input model with multiple constraints
I doubt that you want a symbolic solution. You probably want numbers. So I suggest that you use the Problem-Based Optimization W...
3 jours ago | 0
can i use different solvers for problem based optimisation in matlab
You CAN use different solvers. The question is, SHOULD you? In other questions you have shown that you are trying to solve an MI...
3 jours ago | 0
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Optimizing 1 equation with 7 variables
I think that you would have an easier time formulating your problem by using the problem-based approach. However, if you really...
3 jours ago | 0
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...
9 jours ago | 0
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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...
9 jours ago | 0
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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);...
17 jours ago | 1
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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 ...
17 jours ago | 0
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...
21 jours ago | 0
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...
23 jours ago | 0
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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...
23 jours ago | 0
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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...
24 jours ago | 0
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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 ...
environ un mois ago | 0
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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...
environ un mois ago | 0
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Multi-objective optimization
Are you looking for the gamultiobj solver? Or are you asking something else? Alan Weiss MATLAB mathematical toolbox documentat...
environ un mois ago | 0
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...
environ un mois ago | 1
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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...
environ un mois ago | 0
about genetic algorithm
The topic Mixed Integer ga Optimization adderesses this kind of question. For an example that uses integer variables for non-int...
environ un mois ago | 0
Linear programming exercise help
This looks like quadratic programming, not linear programming. In any case, it looks quite straightforward to solve this kind of...
environ un mois ago | 0
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...
environ un mois ago | 1
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Bayesian Optimization Hyperparameters .
The bayesopt function performs all Bayesian optimization. The bayesopt algorithm is described here. When finding the best parame...
environ un mois ago | 1
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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...
environ un mois ago | 0
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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...
environ un mois ago | 0
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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...
environ un mois ago | 0
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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-...
environ un mois ago | 0
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....
environ un mois ago | 0
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...
environ un mois ago | 2
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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...
environ un mois ago | 1
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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...
environ 2 mois ago | 0
