# 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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**Content Feed**

Question Regarding MultiObjective Optimization - gamultiobj

I have a hard time understanding you because you use vocabulary that is not standard. You say that you have items. I ask about c...

circa un'ora ago | 0

Solving Constrained Convex Optimization Problems Using Gradient Descent

That problem does not look unconstrained to me: you have two sets of constraints listed. But the main point is twofold: there i...

circa 2 ore ago | 0

Optimization with time-dependent constraint

For an example of a similar problem, see Optimal Dispatch of Power Generators: Problem-Based. Alan Weiss MATLAB mathematical t...

2 giorni ago | 0

| accepted

Minimize norm of the complex number array with subtraction of a variable

I am not sure that I understand exactly what you are doing, but if you are willing to accept a least squares solution (rather th...

5 giorni ago | 0

How to incorporate write "options" into the main code (GA algorithm) for beginners

I think that you have a misconception about How the Genetic Algorithm Works. ga always takes exactly two parents for creating a ...

5 giorni ago | 0

Bayesian optimization with fixed 'Method' for fitcensemble

Mdl = fitcensemble(X_train , Y_train ,... "OptimizeHyperparameters", {'NumLearningCycles','LearnRate'} ,... "Hyperpara...

7 giorni ago | 0

find the minimum objective for a given ode as boundary value problem

For examples of optimizing a function given as the solution to an ODE, see Fit ODE, Problem-Based and Fit an Ordinary Differenti...

9 giorni ago | 0

| accepted

change number of pareto point with change number of initial population gamultiobj

You asked the exact same question very recently: https://www.mathworks.com/matlabcentral/answers/1629415-change-number-of-paret...

10 giorni ago | 1

| accepted

FMINCON requires the following inputs to be of data type double: 'X0'.

Without testing anything, I see a problem in this line of code: fun = @(X0,StoreInitialization,ttransij1,texeij1,theta,D_Cloud,...

14 giorni ago | 1

GA is not satisfying nonlinear constraints

The answer is that you cannot ensure that nonlinear constraints are satisfied at every step. Instead, your code must accept poin...

19 giorni ago | 0

| accepted

What is penalty value in GA

The documentation describes the penalty value. As for the lower-left portion of the plot, these points are infeasible. Once ga ...

19 giorni ago | 0

how to use live editor optimize tool ?

Did you try the documentation examples? Solve a Constrained Nonlinear Problem, Solver-Based Get Started with Optimize Live Edi...

21 giorni ago | 0

how to use fsolve with multiple variables with unique names, not vectors

The Problem-Based Workflow for Solving Equations is designed to do exactly what you want. Alan Weiss MATLAB mathematical tool...

24 giorni ago | 1

A genetic algorithm code with constraints on individuals

I cannot understand much of what you say, but it sounds as if you are trying to give bounds on the solution. If I understand you...

circa un mese ago | 0

How do I use the max() function on an optimization expression when using the genetic algorithm?

If you check the Supported Operations for Optimization Variables and Expressions, you see that max is not supported. (Why? I bel...

circa un mese ago | 1

| accepted

Optimization using fmincon with respect to 2 variables

I think that you would find it much easier to use the problem-based approach rather than fmincon directly. The reason is that wi...

circa un mese ago | 0

| accepted

Problem-based optimization, Conversion to double from optim.problemdef.OptimizationExpression is not possible.

To use a general nonlinear function with an optimization variable, you must first convert the function to an optimization expres...

circa un mese ago | 1

| accepted

I have problem with fmincon

Do not use symbolic variables with Optimization Toolbox functions, unless you convert them to function handles using matlabFunct...

circa un mese ago | 0

Optimization method for solving mixed discrete-continuous programming problems

For linear objective and constraints, use intlinprog. For nonlinear objective or constraints, use ga or surogateopt from Global...

circa un mese ago | 0

how to solve a cubic equation where the last term is an array

Try this instead of your code after %EVERYTHING UP TO HERE IS FINE: sol_x = zeros(size(V_total)); for i = 1:numel(V_total) ...

circa 2 mesi ago | 0

| accepted

optimization value not able to acheive

That is not what I get when I run your code: No solution found. fsolve stopped because the last step was ineffective. Howeve...

circa 2 mesi ago | 0

Using the output of a ready function as a constraint

I think that the easiest approach is problem-based. Create optimization variables: the vector A in your case Create the object...

circa 2 mesi ago | 0

Cancel objective function evaluation in Optimization

I think that you can write an output function for the ODE solver that will halt the solver if it takes too long or reaches too l...

circa 2 mesi ago | 0

How to write the equation for minimizing one day power loss of a PV system as an objective function to be used in Genetic Algorithm.

I think that you need to rethink your objective function. It sounds like the input variables must be integers in a certain range...

circa 2 mesi ago | 0

Define a optimization problem

Perhaps you left out constraints that the x, y, and z variables should be nonnegative. Put those constraints and the upper bound...

circa 2 mesi ago | 0

| accepted

How to write the equation for minimizing one day power loss of a PV system as an objective function to be used in Genetic Algorithm.

Your function as written does not make use of the input x1 and x2 values. Instead, it declares these variables as indices for tw...

circa 2 mesi ago | 0

Confusion over use of fmincon for an optimisation problem

There could be several reasons for your results, in addition to the hard-to-diagnose bugs and other programming errors. One is ...

circa 2 mesi ago | 0

fsolve gives the same value for different parameters of the nonlinear equation

Your function funH returns the following iinternal values for your initial point x0 = 5 and the other parameters pmt = [1.027313...

circa 2 mesi ago | 0

What does relative constraint tolerance of fmincon in detail ?

As far as the interpretation, a positive value means at least one constraint is violated. A zero (or negative for other solvers)...

circa 2 mesi ago | 0

| accepted

Find gradient ascent for 3D surface

You might be interested in this example: Pattern Search Climbs Mount Washington Alan Weiss MATLAB mathematical toolbox documen...

circa 2 mesi ago | 0