Answered
Energy storage optimisation problem - separate charge and discharge constraint
You are mixing up the problem-based and solver-based formulations. You need to choose one or the other. If you are using the sol...

2 years ago | 2

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Answered
How can I implement a constraint on any subset of columns in a matrix optimisation variable?
You need to use some of the ideas in Integer and Logical Modeling. Create an auxiliary binary variable tf the same size as resul...

2 years ago | 0

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Answered
How am I getting higher values for my objective function from a global search based on fmincon than I did from fmincon alone?
This does seem strange. If you look at the algorithm description in How GlobalSearch and MultiStart Work, you see that GlobalSea...

2 years ago | 0

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Answered
why there is a different value between the latest Fval and the Optimal Solution that Fmincon gives me
The answer is correct to within tolerances. Generally, you cannot expect an answer that is correct down to the last few decimal ...

2 years ago | 0

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Answered
Solve problem of choice of resistor
To allow this code to work, I copy over your data. % Power source source_V = 5; % voltage of the power source source_I...

2 years ago | 0

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Answered
Link between Genetic Algorithm ga and Simulink
I am no expert in Simulink®, but perhaps some documented examples might show how to link (Global) Optimization Toolbox solvers t...

2 years ago | 0

Answered
Optimization Problem but don't have closed form expression
This seems like a straightforward problem using either the Problem-Based Optimization Workflow or the solver-based approach. As ...

2 years ago | 1

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Answered
How to solve the error "Conversion to logical from optim.problemdef.OptimizationConstraint is not possible!"
You probably need to formulate your constraints according to the procedures in Integer and Logical Modeling. Alan Weiss MATLAB...

2 years ago | 0

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Answered
How do I interpret the results from Multistart?
Here is how to interpret the results. I assume that the local solver is fmincon. The local exitflag is the exit flag from fminc...

2 years ago | 2

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Answered
LaGrange Multiplier constrain with discretised functions
I think that you are making a mistake by trying to use symbolic variables here. If I understand what you are trying to do, you ...

2 years ago | 0

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How to check the FMINCON feasibility correctly
If you look at the documentation for fmincon iterative display, you see: Feasibility: Maximum constraint violation, where satis...

2 years ago | 1

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How can I apply bayesopt to my Simulink model?
As the documentation states, the objective function accepts a 1-by-D table of values, where D is the number of variables. So you...

2 years ago | 1

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Answered
Implement parameter constraint for surrogateopt
The answer depends on your MATLAB version. As the Release Notes show, linear constraints were introduced in R2021a, nonlinear co...

2 years ago | 0

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Answered
How to constrain fmincon unknowns to itself
Or maybe with linear constraints: A = [1 1 -1 -1]; b = 0; unknowns = fmincon(@(x)fun(x),initial,A,b,[],[],lb,ub) What do the...

2 years ago | 0

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Answered
Global variables are forbidden in parallel multistart optimization
There are other ways to pass variables other than declariig them as global. See Passing Extra Parameters. Alan Weiss MATLAB ma...

3 years ago | 1

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Answered
Can I use "xxx.m" file for object function in GA tool
Please report the MATLAB version you are using, such as R2019a. It makes a difference, because, for example, the Optimization ap...

3 years ago | 1

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Hardstop intlinprog & return the current solutions
You don't have to call prob2struct to solve your problem. Just call [sol,fval] = solve(prob,'Options',opts) Now, what should o...

3 years ago | 0

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Answered
How can I use lsqcurvefit with a look-up table search as the objective function? Currently, the initial guess always is identified as a local minimum.
To use lsqcurvefit your function needs to be defined and differentiable for continuous values of p. It looks to me as if your fu...

3 years ago | 0

Answered
optimising variables in for loop
It is not clear to me whether you want to minimize q_backup(k) for one particular value of k or for all k from 1 to 145. Genera...

3 years ago | 0

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Fsolve Intemidiate equations result
You could use persistent variables along with assignin to write the variaible value to a workspace variable. Something like this...

3 years ago | 0

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Supplied objective function must return a scalar value
You have a misconception about what linear constraints mean and what a scalar objective function is. Linear constraints do NOT t...

3 years ago | 0

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How to limit optimization program to choose only natural integers numbers (not float) if my objective function is not linear?
If you have Global Optimization Toolbox you can use Mixed Integer ga Optimization. Alan Weiss MATLAB mathematical toolbox docu...

3 years ago | 0

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Answered
Why does the fmincon optimization give a slightly different solution in MATLAB 2019B as compared to 2020B?
Many things change in each version. The usual issue is that the underlying math libraries can have slight differences. Optimizat...

3 years ago | 0

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hi, i have a problem with ga function. the problem is: Caused by: Failure in initial user-supplied nonlinear constraint function evaluation.
I believe that the error is here: function [c, ceq] = nlc(x) for j=1:320 c(1) = -sum(x(1,:)) +(320/43.65); ...

3 years ago | 0

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Answered
optimization of matrices with random initialization
You would probably do well to use the Problem-Based Optimization Workflow. But you can just as easily change your current soluti...

3 years ago | 0

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How can I implement an "if" in optimization problem?
Yoou might be able to find some techniques in the new documentation topic Integer and Logical Modeling. Alan Weiss MATLAB math...

3 years ago | 0

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Answered
Linear fitting with 2 variables
I think that the Problem-Based Optimization Workflow would help. Write your optimization variables a, b, and c as you have done,...

3 years ago | 1

Answered
replicating excel solver using optimization linprog
I think that you would probably have an easier time formulating your problem by using the Problem-Based Optimization Workflow. ...

3 years ago | 0

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Answered
problem using GA to optimize an image processing index in MATLAB?
I suspect that the problem is your objective function takes too long, possibly it does not even finish. I assume that you have ...

3 years ago | 0

Answered
Trying to solve Bethe equations - system of non linear equations
You are the unfortunate victim of a naming discrepancy. The fsolve you linked is for Optimization Toolbox, not Symbolic Math sym...

3 years ago | 0