# e_frog

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**Content Feed**

Question

Why are there only rank 1 Pareto Points in ever generation? How to interpret optimization results with gamultiobj()?

Hi, I need some help understanding results from gamultibj() to find out if I applied the function to my optimization problem in...

23 days ago | 0 answers | 0

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answersQuestion

Call @gaplotpareto after gamultiobj() has ended

During Optimization with gamultiobj() I plotting the pareto points of 3 specific objectives of my 4 objective functions with thi...

25 days ago | 0 answers | 0

### 0

answersQuestion

Population size decreasing for some objective functions, but not for other objectve functions?

Hi, I need help understanding the algorithm behind gamultiobj (nsga-II). I already read the paper of Deb et al, but that did n...

26 days ago | 0 answers | 0

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answersQuestion

How to pass several anonymous functions to the anonymous fitness function in gamultiobj()?

Hi, i want to optimize a problem with several objectives using gamultiobj(). I have 3 objective funtions, which i want to pass ...

28 days ago | 1 answer | 0

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answerQuestion

How to group specific values i several vectors following a condition?

Hi, I am struggeling to find a method to extract values that comply with a specific condition from a vector. The input is a ra...

1 month ago | 1 answer | 0

### 1

answerQuestion

How does MultiStart generate startpoints? Why is StartPointsToRun even necessary?

As I understand from this "MultiStart uses uniformly distributed start points within bounds, or user-supplied start points." Mul...

8 months ago | 0 answers | 0

### 0

answersSolved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

8 months ago

Question

Fmincon / Multistart: Local minimum found, but one nonlinear constraint is violated

Hi, i am trying to find an optimal point with multistart / fmincon. Matlab finds a local minima, for which the following messag...

9 months ago | 1 answer | 1

### 1

answerQuestion

GlobalSearch - Does a non-default number of trial points stop the effect of the maxTime option?

Hi, I am using GlobalSearch() to find an optimum of a solution of odes in fmincon. The functions in fmincon have many input var...

10 months ago | 0 answers | 0

### 0

answersQuestion

Vicious Circle Problem: How to solve ODEs with variables that are based on the solutions of the ODEs?

Assuming I have the following system of ODEs: dSdt = [S(2); L*S(1)+R*(S(1)-S(3)); S(4); -g*(S(1)-S(3...

10 months ago | 2 answers | 0

### 2

answersQuestion

How to know if a minimum found with Global Search is actually the Global minimum?

I try to find a global minimum with fmincon() in a GlobalSearch. I gave it a maximum runtime of 30 minutes. The solver ended lon...

10 months ago | 1 answer | 0

### 1

answerQuestion

fmincon, nonlcon, ode45 - objective output in nonlinear constraint

I want to use the output of the objective function in the nonlinear constraint function. My goal is to constrain a solution of a...

12 months ago | 1 answer | 0

### 1

answerhow can I solve ODE without initial condition?

Try formulating the problem as a boundary value problem and solving it with bvp4c or bvp5c. See also: Boundary Value Problems...

12 months ago | 0

| accepted

Question

fmincon, nonlcon - too many input arguments

Hi i am trying to minimize some output of a system of 2 ODEs that also are bound by a nonlinear constraint. Unfortunately I cant...

12 months ago | 1 answer | 0

### 1

answerQuestion

Second derivative of solution from ode45

I have a system of 2 second order ODEs, which i converted to a system of fist order ODEs, which ode45 (or ode15s) needs as an in...

1 year ago | 1 answer | 0

### 1

answerQuestion

BVP for system of 2 second order ODEs

I have a system of two second order ODEs that I want to calculate using bvp4c. I have some problems transforming the second orde...

1 year ago | 1 answer | 0

### 1

answerQuestion

dsolve very slow for system of 2 second order ODEs

Hi, I have to solve a system of 2 second order ODEs with 4 initial conditions. They are also coupled (state variables: and ). ...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to solve an ODE with ode45 in a parfor loop?

I have the following code: function [t,S] = solve_ode(fg_vars,tspan) inital_conds = [0 0]; t = zeros(65,1); ...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to solve an ODE with 2 initial conditions and 2 unknown parameters and 3 boundary conditions (overdetermined?)

I have an ODE of the form where a and b are unknown parameters, and F(t) is a fractional function: e.g. The initial condit...

1 year ago | 1 answer | 0