# e_frog

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Question

How to pass extra parameters to custom Output Function?

Hi, I want to pass test_var = 5; to the custom output function [state, options,optchanged] = testFCN(options,state,flag) i...

11 months ago | 1 answer | 0

### 1

answerQuestion

gamultiobj(): what are Fitness, Score and Rank?

Hi, I need some help understanding the differences between the fitness, score and rank of individuals in the genetic algorithm. ...

1 year ago | 0 answers | 0

### 0

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 ...

1 year ago | 1 answer | 0

### 1

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 year 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...

2 years 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:...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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...

2 years 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 ). ...

2 years 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); ...

2 years 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...

2 years ago | 1 answer | 0