Community Profile # Alan Weiss

### MathWorks

Last seen: 1 day 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.

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Solve taking too long, how to optimize code?
Another point of view in case Matt's solution is not satisfactory: work completely in floating point computation rather than sym...

1 day ago | 0

Refreshment of the objective function with FMINCON
I think that you have a mistaken view of what fmincon does. All optimization solvers take a fixed objective function and iterate...

1 day ago | 1

Optimisation: minimise function while maximising a design variable
Perhaps you can change the optimization in a nearly unnoticeable way that would bias solutions to have large values of R, like t...

2 days ago | 1

Problem using fminbnd function
All optimization solvers require that the objective function return a scalar value. You need to write your objective function in...

4 days ago | 0

Augmented Lagrangian and Penalty Methods
Sounds like a homework problem. I suggest that you consult the documentation for passing extra parameters, such as Passing Extr...

4 days ago | 0

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...

8 days 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...

8 days 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...

8 days 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...

8 days 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...

8 days 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...

14 days 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...

14 days 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);...

22 days 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 ...

23 days 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...

26 days 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...

28 days 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...

28 days 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...

30 days 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 ...

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month ago | 0

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

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month ago | 0

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