Community Profile

photo

Alan Weiss

MathWorks

Last seen: 2 dagen ago 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.

Statistics

All
  • Revival Level 3
  • First Submission
  • 36 Month Streak
  • Thankful Level 2
  • Guiding Light
  • Knowledgeable Level 4
  • First Answer
  • Solver

View badges

Content Feed

Answered
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...

2 dagen ago | 0

Answered
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...

2 dagen ago | 1

| accepted

Answered
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...

2 dagen ago | 0

Answered
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...

2 dagen ago | 0

| accepted

Answered
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...

2 dagen ago | 0

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...

8 dagen ago | 0

| accepted

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...

8 dagen ago | 0

| accepted

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);...

16 dagen ago | 1

| accepted

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 ...

17 dagen 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...

20 dagen 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...

22 dagen ago | 0

| accepted

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...

22 dagen ago | 0

| accepted

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...

24 dagen ago | 0

| accepted

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 ...

ongeveer een maand ago | 0

| accepted

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...

ongeveer een maand ago | 0

| accepted

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

ongeveer een maand 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...

ongeveer een maand ago | 1

| accepted

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...

ongeveer een maand 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...

ongeveer een maand 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...

ongeveer een maand 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...

ongeveer een maand ago | 1

| accepted

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

ongeveer een maand ago | 1

| accepted

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...

ongeveer een maand ago | 0

| accepted

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...

ongeveer een maand ago | 0

| accepted

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...

ongeveer een maand ago | 0

| accepted

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-...

ongeveer een maand 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....

ongeveer een maand 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...

ongeveer een maand ago | 2

| accepted

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...

ongeveer een maand ago | 1

| accepted

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...

ongeveer 2 maanden ago | 0

Load more