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Alan Weiss


Last seen: 3 dagar ago

MathWorks

2 022 total contributions 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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Answered
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)...

6 dagar ago | 0

| accepted

Answered
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...

6 dagar ago | 1

| accepted

Answered
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; ...

6 dagar ago | 0

Answered
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...

7 dagar ago | 0

Answered
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 ...

7 dagar ago | 0

Answered
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...

9 dagar ago | 0

Answered
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...

9 dagar ago | 1

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Answered
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...

18 dagar ago | 0

Answered
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...

18 dagar ago | 0

Answered
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...

19 dagar ago | 0

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

21 dagar ago | 0

Answered
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...

24 dagar ago | 0

Answered
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...

24 dagar ago | 1

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Answered
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...

24 dagar ago | 0

| accepted

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

26 dagar ago | 1

Answered
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...

26 dagar ago | 0

| accepted

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

26 dagar ago | 0

Answered
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...

ungefär en månad ago | 0

| accepted

Answered
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...

ungefär en månad ago | 0

Answered
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...

ungefär en månad ago | 0

Answered
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...

ungefär en månad ago | 0

Answered
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...

ungefär en månad ago | 0

Answered
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...

ungefär en månad ago | 0

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

ungefär en månad ago | 0

Answered
convex function with constant Hessian
Perhaps you are looking for quadprog from Optimization Toolbox™. Alan Weiss MATLAB mathematical toolbox documentation

ungefär en månad ago | 0

Answered
Optimization of multiple functions for desired output
I am not sure that I understand what you are trying to do. If you have three variables to minimize, well, either you are fortuna...

ungefär en månad ago | 0

Answered
fzero error in fa value
Next time, please give the full error thrown by the function. As it is, I don't know what the error is. I guess that the error ...

ungefär en månad ago | 0

Answered
Solving Complex Equations Using "fmincon"
I don't understand why you are trying to use fmincon to solve systems of nonlinear equations. Use fsolve for that. And then you ...

ungefär en månad ago | 0

| accepted

Answered
Mesh Adaptive Direct Search: Problems finding global solution
fmincon is the local solver of choice for smooth problems. patternsearch is NOT guaranteed to get a global solution (no solver i...

ungefär en månad ago | 0

| accepted

Answered
ga (genetic algorithm) violated linear constraints
I would rescale the problem first. Your x(1), x(2), x(5), and x(6) variables should be multiplied by 1e8 or 1e9, so that they ha...

ungefär en månad ago | 0

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