Alan Weiss

Last seen: Today

MathWorks

2,028 2011 이후 총 참여 횟수

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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Multiobjective optimization with constraints
Your input data is inconsistent: nvars = 2; lb = [0,0,0,0,0,0]; ub = [Inf,Inf,Inf,Inf,24,24]; Your bounds are on your decisi...

6일 전 | 0

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Optimize parameter of Simulink model to fit experimetal data
I am not sure, but maybe the approaches in one of these examples will help: lsqnonlin with a Simulink® Model Using fminimax wi...

7일 전 | 0

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Is it possible to get some repeated values of non-dominated solutions in a pareto optimal solution set?
It can be difficult for solvers to remove duplicate points themselves. Feel free to do so yourself after the solver finishes. A...

7일 전 | 0

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optimization using solver based
Try adding the following lines after your script has run: options = optimoptions('fmincon','MaxIterations',1e4); [sol,fval,exi...

8일 전 | 0

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Need Urgent Help on PSO to reflect the Mathmatical Function to MATLAB
Did you try fun = @(x)2*(x(1)-2)^2 + 3*(x(1)+x(2))^2 - (x(1)*x(2))^4; [sol,fval] = particleswarm(fun,2) You will see that thi...

8일 전 | 0

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What is the crossover method for solving real coded genetic algorithm in Global Optimization Toolbox
The documentation contains the following: How the Genetic Algorithm Works which talks about crossover in general. Crossover Op...

8일 전 | 0

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How to calculate velocity in PSO CVRP
If you simply want to sort the variables, I suggest that you apply the sort function. nums = [1 4 4 2]; [~,snums] = sort(nums)...

15일 전 | 0

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Global Optimization for a Simulink Model
You probably want to minimize the mean squared error. For an example, see lsqnonlin with a Simulink® Model. You can change the s...

16일 전 | 1

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fmincon contraints range issue
You simply need two constraints, area_surf < 10 and area_surf > 5. function [c, ceq]= contraints(x) c(2) = area_surf(x) - 10; ...

16일 전 | 0

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optimization using symbolic toolbox
Your code returns j = (delta^2*t^3)/3 + (eta^2*t^3)/3 + t With this information, the symbolic portion of your problem is d...

16일 전 | 0

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Optimization tools: handling error output from objective functions
I suggest that you test for unexpected results within your objective function code and handle it appropriately. For example, if ...

16일 전 | 0

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Multi-stage amplifier optimization
I didn't try too run your code, but this line is incorrect syntax: ceq (1) = A(1)*A(2)*A(3)*A(4)*A(5) = 10000; It should be c...

18일 전 | 0

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Unable to use for loop in fmincon
You are not passing the value of p into myfun1. What is it supposed to represent in your code? What I mean is, when you write f...

18일 전 | 1

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Bayesian optimization with sum constraint
This sounds like a balls-in-buckets problem. You have up to balls to place into buckets. The occupancy (number of balls) of bu...

28일 전 | 0

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fminsearch, Not enough input arguments.
Next time please give the entire error message by copying and pasting everything in red: Not enough input arguments. Error i...

28일 전 | 0

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Graphing a Multi-Objective Optimization problem
Using your functions (edited versions below), I called gamultiobj as follows: A = [2 1]; b = 2; options = optimoptions('gamul...

28일 전 | 0

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Mixed Integer Linear Programming Problem
You might find the following documentation useful: Investigate Linear Infeasibilities Alan Weiss MATLAB mathematical toolbox ...

약 1달 전 | 0

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non-linear optimization with complex constrains
I think that you need to solve two different problems, one assuming w =100, one assuming w = 500. Your objective is discontinuou...

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How To Optimize Model Parameters In Simulink?
Perhaps these examples are relevant: Fit ODE, Problem-Based Fit an Ordinary Differential Equation (ODE) Optimizing a Simulati...

약 1달 전 | 1

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plot the final value of optimization
It seems that your data is x(i) and y(i), and the associated 2*a+3 and 4*b+9. Yeah, they are all constants, nothing much to plot...

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Multiobjective Genetic algorithm with integer variables
Sorry, currently there is no built-in function to perform integer-constrained multiobjective optimization. Alan Weiss MATLAB m...

약 1달 전 | 1

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Inverse of a function gives different results than the negative function with fmincon
The problem could be related to a few things, such as numerical stability and the presence of multiple local minima. For numeri...

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What is the scale problem in lsqcurvefit optimization?
Check out the lsqcurvefit FiniteDifferenceStepSize option that you set with optimoptions. Alan Weiss MATLAB mathematical toolb...

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Optimization fmincon with integral. Results not optimal, what am I doing wrong?
The first-order optimality measure is not that small at the end. I suspect that your problem is a bit sensitive. i see in your c...

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Linear programming with conditional constraints
I think that you can do this with mixed-integer linear programming. Create auxiliary binary variables y1 and y2. These variables...

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Failure in initial objective function evaluation. FSOLVE cannot continue. Please help:(
The error is that fsolve expects just one input argument, and you have many (I count 5 arguments, A_py,A_sy,M_py,M_sy,P_c) : g...

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Failure in initial nonlinear constraint function evaluation. FMINCON cannot continue.
You did a good job converting the problem to code. Your only real errors are typos in the nonlinear constraint function. Try thi...

약 1달 전 | 0

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Mixed Integer (binary) Non-linear problem
That is way too many variables for ga even if it handled integer equality constraints. I suggest that you would probably be best...

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from fminsearch to bayesopt
You are free to use bayesopt, but you will have to change your objective function. For bayesopt you first have to create optimiz...

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Mesh Adaptive Direct Search
Before calling patternsearch first set the pseudorandom number generator: rng default % Or any other fixed rng value As for yo...

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