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Alan Weiss


MathWorks

1,823 2011 年以降の合計貢献数

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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Create time dependent internal heat source for heat transfer problem
I am not sure, but I believe that the answer might be that the solver checks if anything is going on at small times, and then de...

7日 前 | 1

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the GA shows the problem with "Failure in initial user-supplied nonlinear constraint function evaluation. "
Please read the documentation on Mixed Integer Optimization. The solver truly does not accept equality constraints along with in...

10日 前 | 0

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Genetic algorithm plots penalty instead of Fitness
Perhaps you have some integer constraints. If not, please show us your options and ga call. Alan Weiss MATLAB mathematical to...

10日 前 | 0

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Parameter estimation of a set of ODE
I'm not sure how your function is given to MATLAB. But suppose that it is in a function file PofT.m. You simply have to include...

11日 前 | 0

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Solving simultaneous equations with fmincon (Error:Not enough input arguments / Supplied objective function must return a scalar value.)
I think that you are making life hard for yourself by using symbolic variables instead of using plain numeric variables and func...

12日 前 | 0

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Display/Plot Functions for Genetic Algorithm seemingly not working when I include nonlinear constraint
When you use a nonlinear constraint function, ga uses a different algorithm that takes many, many more iterations internally tha...

12日 前 | 0

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Result of fmincon()
The returned values are within the constraint tolerance. See Tolerances and Stopping Criteria. Alan Weiss MATLAB mathematical ...

12日 前 | 2

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fmincon works but GA won't work
In general, ga is not as reliable a solver as fmincon. So if you have smooth objective and constraints, you should use fmincon. ...

約1ヶ月 前 | 0

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how to optimize my ODE system using fmincon
Take a look at the examples Fit an ODE to Data and Optimize an ODE in Parallel (the latter example uses Global Optimization Tool...

約2ヶ月 前 | 0

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Duplicate points evaluated in Bayesian Optimization
As you can see from the algorithm description, there is nothing that prevents multiple evaluations of the same points. So it is ...

約2ヶ月 前 | 0

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How can I find a Pareto optimal using weighted sum method in Multi objective optimization ?
There are several approaches to finding Pareto fronts. This example uses fgoalattain, but you can easily modify it to use fminun...

約2ヶ月 前 | 0

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Linear programming and cash flow matching
I don't know for sure, but perhaps this example is relevant. Alan Weiss MATLAB mathematical toolbox documentation

約2ヶ月 前 | 0

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how to plot objective function with variables
You have two definitions of options, meaning the first definition does nothing: options = optimoptions(@fmincon,'Display','iter...

約2ヶ月 前 | 1

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why ga generates different fval and penalty values
Most likely, your x value is infeasible. See Integer ga Algorithm, which states: The penalty function value of a member of a po...

約2ヶ月 前 | 0

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Converting optimization output to struct
You might be interested in the function mapSolution. You need to make the problem structure, but then, given the x output from c...

2ヶ月 前 | 1

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How to use parallel computation in globalsearch function?
I think that you are confused about what GlobalSearch and MultiStart do. Bottom line: I think that you should not use GlobalSear...

2ヶ月 前 | 0

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fmincon does not progress first and then progress but at a rather slow rate
I have no details about what your objective function or constraints look like, so cannot offer any specific advice. For general ...

2ヶ月 前 | 0

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Question regarding the GA optimization
You are free to use nonlinear inequality constraints along with mixed-integer programming in ga. Alan Weiss MATLAB mathematica...

3ヶ月 前 | 0

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how to optimize a function which optimization variable is not in it directly?
This looks like a binary programming problem. I don't know how the D_m depend on the I_{n,k}, but it looks like there is no big ...

3ヶ月 前 | 2

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Problem optimizing anonymous function using fzero
The way that fzero works is it first tries to bracket a root (find points on either side of the root having different function s...

4ヶ月 前 | 0

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search the minimum of function by sse
I think that the documentation on Minimizing Functions of Several Variables will help. Alan Weiss MATLAB mathematical toolbox ...

4ヶ月 前 | 0

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Calculating covariance matrix from Jacobian using lsqcurvefit
This old documentation example might be of some use. Alan Weiss MATLAB mathematical toolbox documentation

4ヶ月 前 | 1

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Optimizing a matrix with cplexlp?
I really don't know, but it is possible that the matchpairs function might be applicable. Alan Weiss MATLAB mathematical toolb...

4ヶ月 前 | 1

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Number of Population and Generation in GA?
it is difficult for me to understand what you are asking, but here is some information that might help you: You can see option ...

5ヶ月 前 | 0

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How can i find the optimal parameters that minimize SSE?
I think that you did not understand the comment about not loading the data within your objective function. You should load it on...

6ヶ月 前 | 0

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How can i find the optimal parameters that minimize SSE?
To solve an optimization problem you have to force your problem into the form required by optimization solvers. Sorry, that's ju...

6ヶ月 前 | 1

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is it possible to determine the values ​​of the input parameters ca, cb, cc and cd for which the cc value at the output would be maximal?
Yes, take a look at this example, which has a much more complicated objective function. If your objective function is only the v...

6ヶ月 前 | 0

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Travelling salesman problem - Detecting subtour
If you have an Optimization Toolbox™ license, take a look at this example, which has code that does what you ask. Access the cod...

6ヶ月 前 | 0

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Optimization with very flat objective function
You can try scaling the function by multiplying it by a large value. You can also set some different options, such as TolFun. An...

6ヶ月 前 | 0

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Resolution of optimization variable in nonlinear optimization problem like simulannealbnd patternsearch
For patternsearch you can set the MeshTolerance option to 1/2 or something like that.If your objective function is very expensiv...

6ヶ月 前 | 0

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